Abstract Urban watersheds produce an instantaneous response to rainfall. That results in stormwater runoff in excess of the capacity of drainage systems. The excess stormwater must be managed to prevent flooding and erosion of streams. Management can be achieved with the help of structural stormwater Best Management Practices (BMPs). Detention ponds is one such BMP commonly found in the Austin, TX, USA. The City of Austin developed a plan to mitigate future events of flooding and erosion, resulting in the development and integration of stormwater BMP algorithms into the sub-hourly version of SWAT model. This paper deals with the development of a physically based algorithm for detention pond. The algorithm was tested using a previously flow-calibrated watershed in the Austin area. From the test results obtained it appears that the detention pond algorithm is functioning satisfactorily. The algorithm developed could be used a) to evaluate the functionality of individual detention pond b) to analyze the benefits of such structures at watershed or higher scales and c) as design tool. Keywords: flooding, detention, urban, watershed, BMP, algorithm, stormwater, modeling
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Assessing the ability of SWAT as a water quality model in the Lake Victoria b...Timo Brussée
There is a need for a water quality model for use in the Lake Victoria basin countries in East-Africa. The
region is characterised by data scarcity, a tropical climate and riverine, lacustrine tidal wetlands which form
an important buffer to riverine pollution of the lake. These characteristics of the basin form a challenge for
water quality models. The objective is to state the strengths and weaknesses of a potential water quality
model under these challenging conditions. This objective is executed with the soil water assessment tool
(SWAT) in a catchment of the Lake Victoria Basin as pilot area. The pilot area of the Mara river basin is
hydrologically complex containing tropical and plantation forest, savanna, grasslands, bi-annual agriculture,
shrublands and wetlands. It has varied soil types and bi-annual rain seasons
The study consist of literature research and flow simulation of the transboundary Mara river basin. The
model study aims to characterise the hydrology in the pilot area. The study includes a thorough analysis of
rainfall, stage and flow data. Model preparation steps include the use of weighted-area rainfall estimation
methods, climate model data and empirical derivation of soil input parameters. Discharge calibration
methods include multi-site calibration, by making use of an alternative objective function statistic for the
commonly used Nash-Sutcliffe Efficiency (NSE) called the Kling-Gupta Efficiency (KGE). The literature study
targets previous flow and water quality studies done in tropical or wetland areas, thereby looking to see how
these studies adapted to hydrological modelling with SWAT in tropical or wetland areas, and why theses
adaptions were made. The literature research also includes a comparison of wetland processes in SWAT
with the physical, biological and chemical processes as described in previous studies.
The Mara river basin flow simulation gave a satisfactory model performance for two out of three calibration
sites, thereby being able to give preliminary outputs on water-balance and other flow characteristics. During
research, a number of model, knowledge and data gaps were found to be critical for better understanding
the hydrological and water quality system workings in the Lake Victoria and Mara river basin. From the
model and literature study it is concluded that several issues on data scarcity and hydrological model
processes in the tropics can be overcome. These do not necessarily decrease model performance or
uncertainty in the SWAT model. However, wetland processes are oversimplified in SWAT. Modification and
coupled SWAT models yet have not been able to provide an alternative to the default model that adequately
represents the main flow, sediment and nutrients processes and fluxes that are present in Mara’s wetlands.
Runoff modelling using hec hms for rural watershedEditorIJAERD
Due to climate change it is very essential to do hydrological modelling. Reliable models are essential for planning,
developmental works, prediction and safety of the population. Hydrological models are used to determine catchment
discharge/flow through an efficient way. HEC-HM (Hydrological engineering centre Hydrological modelling system) is
one of hydrological modelling tool developed by United States army corps of engineer (USACE) for event as well as for
continuous simulations. Models, especially continuous simulations are useful for future predictions of stream flow due to
land-use changes or extreme events phenomenon. In this study continuous hydrologic modellingwas carried out using
HEC HMS modelling tool.
Deficit and Constant Loss methods with Clark transform methods were selected. The calibrated model (period
1986-1988) was validated with data set of the period of 2009-2013. Study concluded that the model recommended and
can be used for stated River as decision support tool in the design and operation.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Assessing the ability of SWAT as a water quality model in the Lake Victoria b...Timo Brussée
There is a need for a water quality model for use in the Lake Victoria basin countries in East-Africa. The
region is characterised by data scarcity, a tropical climate and riverine, lacustrine tidal wetlands which form
an important buffer to riverine pollution of the lake. These characteristics of the basin form a challenge for
water quality models. The objective is to state the strengths and weaknesses of a potential water quality
model under these challenging conditions. This objective is executed with the soil water assessment tool
(SWAT) in a catchment of the Lake Victoria Basin as pilot area. The pilot area of the Mara river basin is
hydrologically complex containing tropical and plantation forest, savanna, grasslands, bi-annual agriculture,
shrublands and wetlands. It has varied soil types and bi-annual rain seasons
The study consist of literature research and flow simulation of the transboundary Mara river basin. The
model study aims to characterise the hydrology in the pilot area. The study includes a thorough analysis of
rainfall, stage and flow data. Model preparation steps include the use of weighted-area rainfall estimation
methods, climate model data and empirical derivation of soil input parameters. Discharge calibration
methods include multi-site calibration, by making use of an alternative objective function statistic for the
commonly used Nash-Sutcliffe Efficiency (NSE) called the Kling-Gupta Efficiency (KGE). The literature study
targets previous flow and water quality studies done in tropical or wetland areas, thereby looking to see how
these studies adapted to hydrological modelling with SWAT in tropical or wetland areas, and why theses
adaptions were made. The literature research also includes a comparison of wetland processes in SWAT
with the physical, biological and chemical processes as described in previous studies.
The Mara river basin flow simulation gave a satisfactory model performance for two out of three calibration
sites, thereby being able to give preliminary outputs on water-balance and other flow characteristics. During
research, a number of model, knowledge and data gaps were found to be critical for better understanding
the hydrological and water quality system workings in the Lake Victoria and Mara river basin. From the
model and literature study it is concluded that several issues on data scarcity and hydrological model
processes in the tropics can be overcome. These do not necessarily decrease model performance or
uncertainty in the SWAT model. However, wetland processes are oversimplified in SWAT. Modification and
coupled SWAT models yet have not been able to provide an alternative to the default model that adequately
represents the main flow, sediment and nutrients processes and fluxes that are present in Mara’s wetlands.
Runoff modelling using hec hms for rural watershedEditorIJAERD
Due to climate change it is very essential to do hydrological modelling. Reliable models are essential for planning,
developmental works, prediction and safety of the population. Hydrological models are used to determine catchment
discharge/flow through an efficient way. HEC-HM (Hydrological engineering centre Hydrological modelling system) is
one of hydrological modelling tool developed by United States army corps of engineer (USACE) for event as well as for
continuous simulations. Models, especially continuous simulations are useful for future predictions of stream flow due to
land-use changes or extreme events phenomenon. In this study continuous hydrologic modellingwas carried out using
HEC HMS modelling tool.
Deficit and Constant Loss methods with Clark transform methods were selected. The calibrated model (period
1986-1988) was validated with data set of the period of 2009-2013. Study concluded that the model recommended and
can be used for stated River as decision support tool in the design and operation.
A study confined to the lower tapi basin in Gujarat, India to find out the primary causes for 2006 floods in Surat city. The study involves collection of topographical data from the local geological survey organization, rainfall data from meteorological department of india and the application of HEC-HMS software from US Army corps of engineers to identify the primary cause of the runoff.
Classification either on quality or type based for groundwater can offer great advantages especially in regional groundwater management. It provides a short, quick processing, interpretation for a lot of complete hydro-chemical data sets and concise presentation of the results. There is a demonstrable need for a quality assurance, with the advanced usage of world's largest fresh water storage i.e Ground water. Its getting depleted over the years and the quality of the same degrading with a rapid pace. Ground water Quality is assessed mainly by the chemical analysis of samples. The data obtained from the chemical analysis is key for the further classification, analysis, correlation etc. Graphical and Numerical interpretation of the data is the main source for Hydro-chemical studies. In this paper we test the performance of the many available graphical and statistical methodologies used to classify water samples including: Collins bar diagram, Stiff pattern diagram, Schoeller plot, Piper diagram, Durov's Double Triangular Diagram, Gibbs's Diagram, Stuyfzand Classification. This paper explains various models which classify, correlate etc., summarizing the water quality data. The basic graphs and diagrams in each category are explained by sample diagrams. In addition to the diagrams an overall characterization of hydro-chemical facies of the water can be carried out by using plots which represents a water type and hardness domain. The combination of graphical and statistical techniques provides a consistent and objective means to classify large numbers of samples while retaining the ease of classic graphical presentation.
Using Computer-simulated hydrological model (SWAT) to estimate the ground-wat...Dhiraj Jhunjhunwala
This work is the result of a project-based course, Water Resources Engineering. The project is about the estimation of ground-water recharge due to rainfall in a US-based watershed. The semi-distributed hydrological model(SWAT) has been used to simulate the monthly input and output sub-basin-wise streamflow values,which have been used to compute the total infiltration. The results have been depicted in th form of various monthy and yearly infilration values
Upstream Suburban Philadelphia Sub-Watershed Cluster Modeling OverviewKim Beidler
Upstream Suburban Philadelphia Sub-Watershed Cluster Modeling Overview by Jeffrey Featherstone, Ph.D., Director, Center for Sustainable Communities, Temple University
This presentation covers my undergrad thesis. I performed hydrodynamic analysis on Upper Baral River with a flow diversion to compare the changes in velocities before and after the installation of the diversion.
A review on managed aquifer recharge by check dams a case study near chennai,...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
A study confined to the lower tapi basin in Gujarat, India to find out the primary causes for 2006 floods in Surat city. The study involves collection of topographical data from the local geological survey organization, rainfall data from meteorological department of india and the application of HEC-HMS software from US Army corps of engineers to identify the primary cause of the runoff.
Classification either on quality or type based for groundwater can offer great advantages especially in regional groundwater management. It provides a short, quick processing, interpretation for a lot of complete hydro-chemical data sets and concise presentation of the results. There is a demonstrable need for a quality assurance, with the advanced usage of world's largest fresh water storage i.e Ground water. Its getting depleted over the years and the quality of the same degrading with a rapid pace. Ground water Quality is assessed mainly by the chemical analysis of samples. The data obtained from the chemical analysis is key for the further classification, analysis, correlation etc. Graphical and Numerical interpretation of the data is the main source for Hydro-chemical studies. In this paper we test the performance of the many available graphical and statistical methodologies used to classify water samples including: Collins bar diagram, Stiff pattern diagram, Schoeller plot, Piper diagram, Durov's Double Triangular Diagram, Gibbs's Diagram, Stuyfzand Classification. This paper explains various models which classify, correlate etc., summarizing the water quality data. The basic graphs and diagrams in each category are explained by sample diagrams. In addition to the diagrams an overall characterization of hydro-chemical facies of the water can be carried out by using plots which represents a water type and hardness domain. The combination of graphical and statistical techniques provides a consistent and objective means to classify large numbers of samples while retaining the ease of classic graphical presentation.
Using Computer-simulated hydrological model (SWAT) to estimate the ground-wat...Dhiraj Jhunjhunwala
This work is the result of a project-based course, Water Resources Engineering. The project is about the estimation of ground-water recharge due to rainfall in a US-based watershed. The semi-distributed hydrological model(SWAT) has been used to simulate the monthly input and output sub-basin-wise streamflow values,which have been used to compute the total infiltration. The results have been depicted in th form of various monthy and yearly infilration values
Upstream Suburban Philadelphia Sub-Watershed Cluster Modeling OverviewKim Beidler
Upstream Suburban Philadelphia Sub-Watershed Cluster Modeling Overview by Jeffrey Featherstone, Ph.D., Director, Center for Sustainable Communities, Temple University
This presentation covers my undergrad thesis. I performed hydrodynamic analysis on Upper Baral River with a flow diversion to compare the changes in velocities before and after the installation of the diversion.
A review on managed aquifer recharge by check dams a case study near chennai,...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
Floodplain. Where dou you start from? Ravine erosion (embankement, walls and ravine bed)- The 3 D simulation gives a perspective of the erosion and deposition o sediments.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Sufficiency of water distributory(hlbc)eSAT Journals
Abstract
It is known fact that India has a very large population and different studies show that it will continue to rise. The precipitation in
India is extremely conflicting in mainstream varieties. The normal yearly precipitation for India has been assessed at 1,143 mm
for the actual surviving of the nation, there is a good requirement for actualizing and arrangement of watering system procedures
for the time being, and in the future. The present condition of canal and present cropping pattern, water is insufficient for the
designed command area. In this method both discharge & crop requirement is considered. Hence for improving the irrigating
capacity of canal, designed cropping pattern should be strictly followed. Increased pipe outlets should be reduced to its design
size. Also uncontrolled pipe outlets should be controlled by suitable controlling methods for determining the sufficiency of water
distributory. In order to determine the sufficiency of water, a distributory (D-65) in Hemavathi canal system is considered which
runs for a length of 26.675 km having command area 4703.08 Ha. Crop water requirement by Duty method & Modified Penman’s
Equation of discharge through outlets is used for determining sufficiency of water. Climatic data for Modified Penman’s method
is collected for a period of 5 year from K.R Pete Hydrometer logical station in this connection.
Key Words: Precipitation1, Cropping2, Distributory3 Controlling4 and Sufficiency5 .
Hydrologic data generally consist of a sequence of observations of some phase of the hydrologic cycle made at a particular site. The data may be a record of the discharge of a stream at a particular place, or it may be a record of the amount of rainfall caught in a particular rain gage.
Although for most hydrologic purposes a long record is preferred to a short one, the user should recognize that the longer the record the greater the chance that there has been a change in the physical conditions of the basin or in the methods of data collection. If these are appreciable, the composite record would represent only a nonexistent condition and not one that existed either before or after the change. Such a record is inconsistent.
Rooftop rainwater harvesting (rrwh) at spsv campus, visnagar gujarat a case...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
DETERMINATION OF NET FLOWS INTO ALMATTI RESERVOIR FROM CWC GAUGE DATA AND RES...IAEME Publication
This paper presents the determination of net flows into Almatti reservoir from CWC data and reservoir data. From the study it can be concluded that the average flow in to Almatti will be 574.86 TMC, the maximum inflow will be 1196.8 TMC and the minimum flow will be 166.99 TMC. The flows in annual in deficit years may reduce by about 50 TMC but there is no variation in the good years in the good years as the storage effects will take care of this aspect during good years. It can be concluded that there will be reduction of flows in the June and July flows in the ultimate scenario except in very good years.
A clear water scour around a circular bridge pier under steady flow for diffe...eSAT Journals
Abstract The loose non cohesive material through which a river flows is generally called sediment. Local scour at piers and abutments is the main reason for the collapse of bridges founded in alluvial sediments. Clear water scour refers to the situation where no sediment is supplied by the approaching flow in the zone of scour. Many investigators have studied various aspects of scour. However, the study on scour under steady condition for same discharge with same depth of flow for different pier diameters is limited. In present study laboratory experiment was conducted on different pier sizes of circular piers by keeping discharge constant under clear water scour condition. It is found that Non dimensional scour depth gradient is different up to opening ratio 0.8 having less slope and its slope is steep above 0.8 opening ratio. Keywords: -clear water scour; Froude’s number; sediment; equilibrium scour.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Head Loss Estimation for Water Jets from Flip Bucketstheijes
Water jet issued from flip bucket at the end of the spillway of a dam can be a threat for the stability and safety of the dam body due to subsequent scour at the impingement point. However, a strong jet from the flip bucket interacts with the surrounding air and develops into an aerated turbulent jet while the jet impact and scouring effect is reduced significantly. Aeration of the jet, at the same time, cause head losses along the trajectory. An experimental study is conducted to measure the trajectory lengths and investigate the effect of water depth in the river on the dynamic pressures acted on the river bed. The trajectory lengths with and without air entrainment are calculated using empirical equations and compared with the measurements. Head losses due to air entrainment are determined using the difference of the trajectory lengths with and without aeration, based on the projectile motion theory. Numerical simulation of the flow over the spillway, along the flip bucket and the jet trajectory is made and the results are compared with the experimental data. It is observed that trajectory lengths obtained from experiments, numerical simulation and empirical formulas are comparable with negligible differences. This allows us to combine alternate approaches to determine the trajectory lengths with and without air entrainment and estimate the head losses accordingly.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Estimation of surface runoff in nallur amanikere watershed using scs cn methodeSAT Journals
Abstract
The development of watershed aims at productive utilization of all the available natural resources in the entire area extending from
ridge line to stream outlet. The per capita availability of land for cultivation has been decreasing over the years. Therefore, water and
the related land resources must be developed, utilized and managed in an integrated and comprehensive manner. Remote sensing and
GIS techniques are being increasingly used for planning, management and development of natural resources. The study area, Nallur
Amanikere watershed geographically lies between 110 38’ and 110 52’ N latitude and 760 30’ and 760 50’ E longitude with an area of
415.68 Sq. km. The thematic layers such as land use/land cover and soil maps were derived from remotely sensed data and overlayed
through ArcGIS software to assign the curve number on polygon wise. The daily rainfall data of six rain gauge stations in and around
the watershed (2001-2011) was used to estimate the daily runoff from the watershed using Soil Conservation Service - Curve Number
(SCS-CN) method. The runoff estimated from the SCS-CN model was then used to know the variation of runoff potential with different
land use/land cover and with different soil conditions.
Keywords: Watershed, Nallur watershed, Surface runoff, Rainfall-Runoff, SCS-CN, Remote Sensing, GIS.
Estimation of surface runoff in nallur amanikere watershed using scs cn methodeSAT Journals
Abstract
The development of watershed aims at productive utilization of all the available natural resources in the entire area extending from
ridge line to stream outlet. The per capita availability of land for cultivation has been decreasing over the years. Therefore, water and
the related land resources must be developed, utilized and managed in an integrated and comprehensive manner. Remote sensing and
GIS techniques are being increasingly used for planning, management and development of natural resources. The study area, Nallur
Amanikere watershed geographically lies between 110 38’ and 110 52’ N latitude and 760 30’ and 760 50’ E longitude with an area of
415.68 Sq. km. The thematic layers such as land use/land cover and soil maps were derived from remotely sensed data and overlayed
through ArcGIS software to assign the curve number on polygon wise. The daily rainfall data of six rain gauge stations in and around
the watershed (2001-2011) was used to estimate the daily runoff from the watershed using Soil Conservation Service - Curve Number
(SCS-CN) method. The runoff estimated from the SCS-CN model was then used to know the variation of runoff potential with different
land use/land cover and with different soil conditions.
Keywords: Watershed, Nallur watershed, Surface runoff, Rainfall-Runoff, SCS-CN, Remote Sensing, GIS.
Similar to Hydrologic modeling of detention pond (20)
Mechanical properties of hybrid fiber reinforced concrete for pavementseSAT Journals
Abstract
The effect of addition of mono fibers and hybrid fibers on the mechanical properties of concrete mixture is studied in the present
investigation. Steel fibers of 1% and polypropylene fibers 0.036% were added individually to the concrete mixture as mono fibers and
then they were added together to form a hybrid fiber reinforced concrete. Mechanical properties such as compressive, split tensile and
flexural strength were determined. The results show that hybrid fibers improve the compressive strength marginally as compared to
mono fibers. Whereas, hybridization improves split tensile strength and flexural strength noticeably.
Keywords:-Hybridization, mono fibers, steel fiber, polypropylene fiber, Improvement in mechanical properties.
Material management in construction – a case studyeSAT Journals
Abstract
The objective of the present study is to understand about all the problems occurring in the company because of improper application
of material management. In construction project operation, often there is a project cost variance in terms of the material, equipments,
manpower, subcontractor, overhead cost, and general condition. Material is the main component in construction projects. Therefore,
if the material management is not properly managed it will create a project cost variance. Project cost can be controlled by taking
corrective actions towards the cost variance. Therefore a methodology is used to diagnose and evaluate the procurement process
involved in material management and launch a continuous improvement was developed and applied. A thorough study was carried
out along with study of cases, surveys and interviews to professionals involved in this area. As a result, a methodology for diagnosis
and improvement was proposed and tested in selected projects. The results obtained show that the main problem of procurement is
related to schedule delays and lack of specified quality for the project. To prevent this situation it is often necessary to dedicate
important resources like money, personnel, time, etc. To monitor and control the process. A great potential for improvement was
detected if state of the art technologies such as, electronic mail, electronic data interchange (EDI), and analysis were applied to the
procurement process. These helped to eliminate the root causes for many types of problems that were detected.
Managing drought short term strategies in semi arid regions a case studyeSAT Journals
Abstract
Drought management needs multidisciplinary action. Interdisciplinary efforts among the experts in various fields of the droughts
prone areas are helpful to achieve tangible and permanent solution for this recurring problem. The Gulbarga district having the total
area around 16, 240 sq.km, and accounts 8.45 per cent of the Karnataka state area. The district has been situated with latitude 17º 19'
60" North and longitude of 76 º 49' 60" east. The district is situated entirely on the Deccan plateau positioned at a height of 300 to
750 m above MSL. Sub-tropical, semi-arid type is one among the drought prone districts of Karnataka State. The drought
management is very important for a district like Gulbarga. In this paper various short term strategies are discussed to mitigate the
drought condition in the district.
Keywords: Drought, South-West monsoon, Semi-Arid, Rainfall, Strategies etc.
Life cycle cost analysis of overlay for an urban road in bangaloreeSAT Journals
Abstract
Pavements are subjected to severe condition of stresses and weathering effects from the day they are constructed and opened to traffic
mainly due to its fatigue behavior and environmental effects. Therefore, pavement rehabilitation is one of the most important
components of entire road systems. This paper highlights the design of concrete pavement with added mono fibers like polypropylene,
steel and hybrid fibres for a widened portion of existing concrete pavement and various overlay alternatives for an existing
bituminous pavement in an urban road in Bangalore. Along with this, Life cycle cost analyses at these sections are done by Net
Present Value (NPV) method to identify the most feasible option. The results show that though the initial cost of construction of
concrete overlay is high, over a period of time it prove to be better than the bituminous overlay considering the whole life cycle cost.
The economic analysis also indicates that, out of the three fibre options, hybrid reinforced concrete would be economical without
compromising the performance of the pavement.
Keywords: - Fatigue, Life cycle cost analysis, Net Present Value method, Overlay, Rehabilitation
Laboratory studies of dense bituminous mixes ii with reclaimed asphalt materialseSAT Journals
Abstract
The issue of growing demand on our nation’s roadways over that past couple of decades, decreasing budgetary funds, and the need to
provide a safe, efficient, and cost effective roadway system has led to a dramatic increase in the need to rehabilitate our existing
pavements and the issue of building sustainable road infrastructure in India. With these emergency of the mentioned needs and this
are today’s burning issue and has become the purpose of the study.
In the present study, the samples of existing bituminous layer materials were collected from NH-48(Devahalli to Hassan) site.The
mixtures were designed by Marshall Method as per Asphalt institute (MS-II) at 20% and 30% Reclaimed Asphalt Pavement (RAP).
RAP material was blended with virgin aggregate such that all specimens tested for the, Dense Bituminous Macadam-II (DBM-II)
gradation as per Ministry of Roads, Transport, and Highways (MoRT&H) and cost analysis were carried out to know the economics.
Laboratory results and analysis showed the use of recycled materials showed significant variability in Marshall Stability, and the
variability increased with the increase in RAP content. The saving can be realized from utilization of recycled materials as per the
methodology, the reduction in the total cost is 19%, 30%, comparing with the virgin mixes.
Keywords: Reclaimed Asphalt Pavement, Marshall Stability, MS-II, Dense Bituminous Macadam-II
Laboratory investigation of expansive soil stabilized with natural inorganic ...eSAT Journals
Abstract
Soil stabilization has proven to be one of the oldest techniques to improve the soil properties. Literature review conducted revealed
that uses of natural inorganic stabilizers are found to be one of the best options for soil stabilization. In this regard an attempt has
been made to evaluate the influence of RBI-81 stabilizer on properties of black cotton soil through laboratory investigations. Black
cotton soil with varying percentages of RBI-81 viz., 0, 0.5, 1, 1.5, 2, and 2.5 percent were studied for moisture density relationships
and strength behaviour of soils. Also the effect of curing period was evaluated as literature review clearly emphasized the strength
gain of soils stabilized with RBI-81 over a period of time. The results obtained shows that the unconfined compressive strength of
specimens treated with RBI-81 increased approximately by 250% for a curing period of 28 days as compared to virgin soil. Further
the CBR value improved approximately by 400%. The studies indicated an increasing trend for soil strength behaviour with
increasing percentage of RBI-81 suggesting its potential applications in soil stabilization.
Influence of reinforcement on the behavior of hollow concrete block masonry p...eSAT Journals
Abstract
Reinforced masonry was developed to exploit the strength potential of masonry and to solve its lack of tensile strength. Experimental
and analytical studies have been carried out to investigate the effect of reinforcement on the behavior of hollow concrete block
masonry prisms under compression and to predict ultimate failure compressive strength. In the numerical program, three dimensional
non-linear finite elements (FE) model based on the micro-modeling approach is developed for both unreinforced and reinforced
masonry prisms using ANSYS (14.5). The proposed FE model uses multi-linear stress-strain relationships to model the non-linear
behavior of hollow concrete block, mortar, and grout. Willam-Warnke’s five parameter failure theory has been adopted to model the
failure of masonry materials. The comparison of the numerical and experimental results indicates that the FE models can successfully
capture the highly nonlinear behavior of the physical specimens and accurately predict their strength and failure mechanisms.
Keywords: Structural masonry, Hollow concrete block prism, grout, Compression failure, Finite element method,
Numerical modeling.
Influence of compaction energy on soil stabilized with chemical stabilizereSAT Journals
Abstract
Increase in traffic along with heavier magnitude of wheel loads cause rapid deterioration in pavements. There is a need to improve
density, strength of soil subgrade and other pavement layers. In this study an attempt is made to improve the properties of locally
available loamy soil using twin approaches viz., i) increasing the compaction of soil and ii) treating the soil with chemical stabilizer.
Laboratory studies are carried out on both untreated and treated soil samples compacted by different compaction efforts. Studies
show that increase in compaction effort results in increase in density of soil. However in soil treated with chemical stabilizer, rate of
increase in density is not significant. The soil treated with chemical stabilizer exhibits improvement in both strength and performance
properties.
Keywords: compaction, density, subgradestabilization, resilient modulus
Geographical information system (gis) for water resources managementeSAT Journals
Abstract
Water resources projects are inherited with overlapping and at times conflicting objectives. These projects are often of varied sizes
ranging from major projects with command areas of millions of hectares to very small projects implemented at the local level. Thus,
in all these projects there is seldom proper coordination which is essential for ensuring collective sustainability.
Integrated watershed development and management is the accepted answer but in turn requires a comprehensive framework that can
enable planning process involving all the stakeholders at different levels and scales is compulsory. Such a unified hydrological
framework is essential to evaluate the cause and effect of all the proposed actions within the drainage basins.
The present paper describes a hydrological framework developed in the form of a Hydrologic Information System (HIS) which is
intended to meet the specific information needs of the various line departments of a typical State connected with water related aspects.
The HIS consist of a hydrologic information database coupled with tools for collating primary and secondary data and tools for
analyzing and visualizing the data and information. The HIS also incorporates hydrological model base for indirect assessment of
various entities of water balance in space and time. The framework would be maintained and updated to reflect fully the most
accurate ground truth data and the infrastructure requirements for planning and management.
Keywords: Hydrological Information System (HIS); WebGIS; Data Model; Web Mapping Services
Forest type mapping of bidar forest division, karnataka using geoinformatics ...eSAT Journals
Abstract
The study demonstrate the potentiality of satellite remote sensing technique for the generation of baseline information on forest types
including tree plantation details in Bidar forest division, Karnataka covering an area of 5814.60Sq.Kms. The Total Area of Bidar
forest division is 5814Sq.Kms analysis of the satellite data in the study area reveals that about 84% of the total area is Covered by
crop land, 1.778% of the area is covered by dry deciduous forest, 1.38 % of mixed plantation, which is very threatening to the
environmental stability of the forest, future plantation site has been mapped. With the use of latest Geo-informatics technology proper
and exact condition of the trees can be observed and necessary precautions can be taken for future plantation works in an appropriate
manner
Keywords:-RS, GIS, GPS, Forest Type, Tree Plantation
Factors influencing compressive strength of geopolymer concreteeSAT Journals
Abstract
To study effects of several factors on the properties of fly ash based geopolymer concrete on the compressive strength and also the
cost comparison with the normal concrete. The test variables were molarities of sodium hydroxide(NaOH) 8M,14M and 16M, ratio of
NaOH to sodium silicate (Na2SiO3) 1, 1.5, 2 and 2.5, alkaline liquid to fly ash ratio 0.35 and 0.40 and replacement of water in
Na2SiO3 solution by 10%, 20% and 30% were used in the present study. The test results indicated that the highest compressive
strength 54 MPa was observed for 16M of NaOH, ratio of NaOH to Na2SiO3 2.5 and alkaline liquid to fly ash ratio of 0.35. Lowest
compressive strength of 27 MPa was observed for 8M of NaOH, ratio of NaOH to Na2SiO3 is 1 and alkaline liquid to fly ash ratio of
0.40. Alkaline liquid to fly ash ratio of 0.35, water replacement of 10% and 30% for 8 and 16 molarity of NaOH and has resulted in
compressive strength of 36 MPa and 20 MPa respectively. Superplasticiser dosage of 2 % by weight of fly ash has given higher
strength in all cases.
Keywords: compressive strength, alkaline liquid, fly ash
Experimental investigation on circular hollow steel columns in filled with li...eSAT Journals
Abstract
Composite Circular hollow Steel tubes with and without GFRP infill for three different grades of Light weight concrete are tested for
ultimate load capacity and axial shortening , under Cyclic loading. Steel tubes are compared for different lengths, cross sections and
thickness. Specimens were tested separately after adopting Taguchi’s L9 (Latin Squares) Orthogonal array in order to save the initial
experimental cost on number of specimens and experimental duration. Analysis was carried out using ANN (Artificial Neural
Network) technique with the assistance of Mini Tab- a statistical soft tool. Comparison for predicted, experimental & ANN output is
obtained from linear regression plots. From this research study, it can be concluded that *Cross sectional area of steel tube has most
significant effect on ultimate load carrying capacity, *as length of steel tube increased- load carrying capacity decreased & *ANN
modeling predicted acceptable results. Thus ANN tool can be utilized for predicting ultimate load carrying capacity for composite
columns.
Keywords: Light weight concrete, GFRP, Artificial Neural Network, Linear Regression, Back propagation, orthogonal
Array, Latin Squares
Experimental behavior of circular hsscfrc filled steel tubular columns under ...eSAT Journals
Abstract
This paper presents an outlook on experimental behavior and a comparison with predicted formula on the behaviour of circular
concentrically loaded self-consolidating fibre reinforced concrete filled steel tube columns (HSSCFRC). Forty-five specimens were
tested. The main parameters varied in the tests are: (1) percentage of fiber (2) tube diameter or width to wall thickness ratio (D/t
from 15 to 25) (3) L/d ratio from 2.97 to 7.04 the results from these predictions were compared with the experimental data. The
experimental results) were also validated in this study.
Keywords: Self-compacting concrete; Concrete-filled steel tube; axial load behavior; Ultimate capacity.
Evaluation of punching shear in flat slabseSAT Journals
Abstract
Flat-slab construction has been widely used in construction today because of many advantages that it offers. The basic philosophy in
the design of flat slab is to consider only gravity forces; this method ignores the effect of punching shear due to unbalanced moments
at the slab column junction which is critical. An attempt has been made to generate generalized design sheets which accounts both
punching shear due to gravity loads and unbalanced moments for cases (a) interior column; (b) edge column (bending perpendicular
to shorter edge); (c) edge column (bending parallel to shorter edge); (d) corner column. These design sheets are prepared as per
codal provisions of IS 456-2000. These design sheets will be helpful in calculating the shear reinforcement to be provided at the
critical section which is ignored in many design offices. Apart from its usefulness in evaluating punching shear and the necessary
shear reinforcement, the design sheets developed will enable the designer to fix the depth of flat slab during the initial phase of the
design.
Keywords: Flat slabs, punching shear, unbalanced moment.
Evaluation of performance of intake tower dam for recent earthquake in indiaeSAT Journals
Abstract
Intake towers are typically tall, hollow, reinforced concrete structures and form entrance to reservoir outlet works. A parametric
study on dynamic behavior of circular cylindrical towers can be carried out to study the effect of depth of submergence, wall thickness
and slenderness ratio, and also effect on tower considering dynamic analysis for time history function of different soil condition and
by Goyal and Chopra accounting interaction effects of added hydrodynamic mass of surrounding and inside water in intake tower of
dam
Key words: Hydrodynamic mass, Depth of submergence, Reservoir, Time history analysis,
Evaluation of operational efficiency of urban road network using travel time ...eSAT Journals
Abstract
Efficiency of the road network system is analyzed by travel time reliability measures. The study overlooks on an important measure of
travel time reliability and prioritizing Tiruchirappalli road network. Traffic volume and travel time were collected using license plate
matching method. Travel time measures were estimated from average travel time and 95th travel time. Effect of non-motorized vehicle
on efficiency of road system was evaluated. Relation between buffer time index and traffic volume was created. Travel time model has
been developed and travel time measure was validated. Then service quality of road sections in network were graded based on
travel time reliability measures.
Keywords: Buffer Time Index (BTI); Average Travel Time (ATT); Travel Time Reliability (TTR); Buffer Time (BT).
Estimation of morphometric parameters and runoff using rs & gis techniqueseSAT Journals
Abstract
Land and water are the two vital natural resources, the optimal management of these resources with minimum adverse environmental
impact are essential not only for sustainable development but also for human survival. Satellite remote sensing with geographic
information system has a pragmatic approach to map and generate spatial input layers of predicting response behavior and yield of
watershed. Hence, in the present study an attempt has been made to understand the hydrological process of the catchment at the
watershed level by drawing the inferences from moprhometric analysis and runoff. The study area chosen for the present study is
Yagachi catchment situated in Chickamaglur and Hassan district lies geographically at a longitude 75⁰52’08.77”E and
13⁰10’50.77”N latitude. It covers an area of 559.493 Sq.km. Morphometric analysis is carried out to estimate morphometric
parameters at Micro-watershed to understand the hydrological response of the catchment at the Micro-watershed level. Daily runoff
is estimated using USDA SCS curve number model for a period of 10 years from 2001 to 2010. The rainfall runoff relationship of the
study shows there is a positive correlation.
Keywords: morphometric analysis, runoff, remote sensing and GIS, SCS - method
-
Effect of variation of plastic hinge length on the results of non linear anal...eSAT Journals
Abstract The nonlinear Static procedure also well known as pushover analysis is method where in monotonically increasing loads are applied to the structure till the structure is unable to resist any further load. It is a popular tool for seismic performance evaluation of existing and new structures. In literature lot of research has been carried out on conventional pushover analysis and after knowing deficiency efforts have been made to improve it. But actual test results to verify the analytically obtained pushover results are rarely available. It has been found that some amount of variation is always expected to exist in seismic demand prediction of pushover analysis. Initial study is carried out by considering user defined hinge properties and default hinge length. Attempt is being made to assess the variation of pushover analysis results by considering user defined hinge properties and various hinge length formulations available in literature and results compared with experimentally obtained results based on test carried out on a G+2 storied RCC framed structure. For the present study two geometric models viz bare frame and rigid frame model is considered and it is found that the results of pushover analysis are very sensitive to geometric model and hinge length adopted. Keywords: Pushover analysis, Base shear, Displacement, hinge length, moment curvature analysis
Effect of use of recycled materials on indirect tensile strength of asphalt c...eSAT Journals
Abstract
Depletion of natural resources and aggregate quarries for the road construction is a serious problem to procure materials. Hence
recycling or reuse of material is beneficial. On emphasizing development in sustainable construction in the present era, recycling of
asphalt pavements is one of the effective and proven rehabilitation processes. For the laboratory investigations reclaimed asphalt
pavement (RAP) from NH-4 and crumb rubber modified binder (CRMB-55) was used. Foundry waste was used as a replacement to
conventional filler. Laboratory tests were conducted on asphalt concrete mixes with 30, 40, 50, and 60 percent replacement with RAP.
These test results were compared with conventional mixes and asphalt concrete mixes with complete binder extracted RAP
aggregates. Mix design was carried out by Marshall Method. The Marshall Tests indicated highest stability values for asphalt
concrete (AC) mixes with 60% RAP. The optimum binder content (OBC) decreased with increased in RAP in AC mixes. The Indirect
Tensile Strength (ITS) for AC mixes with RAP also was found to be higher when compared to conventional AC mixes at 300C.
Keywords: Reclaimed asphalt pavement, Foundry waste, Recycling, Marshall Stability, Indirect tensile strength.
Effect of skew angle on static behaviour of reinforced concrete slab bridge d...eSAT Journals
Abstract
The effect of a skew angle on single-span reinforced concrete bridges is analyzed using the finite-element method and the results are
presented in this paper. Investigations are carried out on RC slab bridge decks with and without edge beams to study the influence of
aspect ratio, skew angle and type of load. The finite-element analysis results for skewed bridges are compared to the reference
straight bridges for dead load, IRC Class A loading and IRC 70R loading for with and without edge beam. A total of 90 bridge models
are analyzed. The variation of maximum deflection, maximum longitudinal sagging bending moment, maximum torsional moment, and
maximum support reaction with skew angle is studied for all 90 bridge deck models. The FEA results of Dead load and Live load
bending moments and deflections decreases with increase in skew angle, where as maximum support reactions increases with increase
in skew angle and the maximum torsional moment increases with skew angle up to 45 degrees and there after decreases. The benefit
of providing edge beam is reflected in significant decrease in deflection, longitudinal bending moment and torsional moment.
Keywords: Bridges, skew angle; Concrete slabs; Finite element method; span length; dead load; IRC Class A loading
and IRC Class 70R loading.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Final project report on grocery store management system..pdf
Hydrologic modeling of detention pond
1. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 657
HYDROLOGIC MODELING OF DETENTION POND
Narayanan Kannan1
, Jaehak Jeong2
, Jeff Arnold3
, Roger Glick4
, Leila Gosselink5
, Raghavan Srinivasan6
1
Associate Research Scientist, Texas Institute of Applied Environmental Research, Tarleton State University, Stephenville,
Texas, USA
2
Assistant Professor, Texas AgriLife Research, Blackland Research and Extension Center, Temple, Texas, USA
3
Supervisory Agricultural Engineer, Agricultural Research Service-United States Department of Agriculture, Grassland
Soil and Water Research Laboratory, Temple, Texas, USA
4
Manager, Watershed Protection and Development Review Department, City of Austin, Texas, USA,
5
Watershed Protection and Development Review Department, City of Austin, Texas, USA
6
Professor and Director, Spatial Sciences Lab, Texas A&M University, College Station, Texas, USA,
Abstract
Urban watersheds produce an instantaneous response to rainfall. That results in stormwater runoff in excess of the capacity of
drainage systems. The excess stormwater must be managed to prevent flooding and erosion of streams. Management can be achieved
with the help of structural stormwater Best Management Practices (BMPs). Detention ponds is one such BMP commonly found in the
Austin, TX, USA. The City of Austin developed a plan to mitigate future events of flooding and erosion, resulting in the development
and integration of stormwater BMP algorithms into the sub-hourly version of SWAT model. This paper deals with the development of
a physically based algorithm for detention pond. The algorithm was tested using a previously flow-calibrated watershed in the Austin
area. From the test results obtained it appears that the detention pond algorithm is functioning satisfactorily. The algorithm
developed could be used a) to evaluate the functionality of individual detention pond b) to analyze the benefits of such structures at
watershed or higher scales and c) as design tool.
Keywords: flooding, detention, urban, watershed, BMP, algorithm, stormwater, modeling
----------------------------------------------------------------------***------------------------------------------------------------------------
1. INTRODUCTION
A detention pond is a stormwater Best Management Practice
(BMP) aimed to protect against flooding. It uses a controlled
outflow structure to limit the outflow for large volumes of
inflow [1,2]. The outflow structure can be a weir or orifice
depending on the need (Figure 1). Detention ponds are
typically built across creeks or rivers (on-stream structure)
near new land development projects to mitigate flooding and
subsequent erosion as a result of increased flow velocity. The
outflow from detention ponds is generally passed to the same
river or creek from where it received the inflow. Sometimes
they are built primarily to control extreme events such as a
100 year storm event. They are typically designed to empty
within 6 to 12 hours after the storm [2]. Detention ponds are
widely used in many parts of the United States (especially
Texas and California) to mitigate flood peaks and magnitude
[3].
Scientists [4,5] made an attempt to simulate detention
reservoirs using numerical modeling approach with an implicit
finite difference scheme. They used the 1D Saint Venant
equations to model the unsteady water flow in detention
reservoirs. They also developed criteria to estimate the
appropriate time step for modeling. They evaluated their
approach with observations from Caloosahatchee River Basin
in Florida. A watershed-scale evaluation of detention pond
was carried out [6]. A model was developed [7] to optimize
the size of detention ponds for Austin area. Monitoring of flow
and water quality at detention basins is rare given the quick
and infrequent nature of rainfall events and other constraints
such as cost.
For this study modeling tools were developed to simulate
detention pond and integrated with the sub-daily version of
SWAT model [8]. To our knowledge this is the first model
development study for a detention pond using analytical
modeling approach from a hydrologic perspective (rather than
a design perspective) intended for applications to watershed
and higher scales.
2. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 658
Fig -1: Typical detention ponds of Austin, TX, USA
2. MODEL THEORY AND CONFIGURATION
2.1 Detention Pond-Water Balance
The water balance for a detention pond is:
(1)
Where V is the volume of water in the detention pond at the
end of the time step (m3
of water), Vbackup is the volume of
water stored in the pond at the beginning of the time step (m3
of water), Vflowin is the volume of water entering detention
pond during the time step (m3
of water), Vflowout is the volume
of water flowing out of pond during the time step (m3
of
water), Vpcp is the volume of precipitation falling on the
detention pod during the time step (m3
of water), Vevap is the
volume of water removed from the pond by evaporation
during the time step (m3
of water), and Vseep is the volume of
water lost from the pond by seepage (m3
of water).
2.2 Water Backup Volume
A detention pond is a controlled release structure. Therefore,
for a large volume of water inflow there will be detained water
on the upstream side. If the shape and size of water backup is
computed, the water balance at any time can be computed.
The inflow will be computed by the model depending on the
contributing drainage area. Although detention ponds can take
many shapes, large detention basins are frequently designed
by detaining water within the drainage way and the water
backed-up can be assumed to be a semi parabolic wedge
behind a dam structure (Figure 2).
ESA-Evaporative surface area SSA-Seepage surface area
Fig -2: Shape of water backup behind a detention pond
Volume of parabolic wedge (V) is a function of area of cross
section and length.
2
lA
V
(2)
Where, V is volume of parabolic wedge (volume of water back
up) (m3
) and l is length of water backed-up (m) and the areas
is
3
2 wd
A
(3)
Where d is the depth (m) and w is width (m).
Substituting equation 3 in 2,
3
lwd
V
(4)
And evaluating the slope of the creek, S,
l
d
S (5)
From (5) we have
lSd (6)
w
l
R (7)
Where, R is the ratio of length to width of water back up
(needed data from user/design monograph/thumb rules)
d
w
d
l
ESA
SSA
r
A
3. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 659
Rearranging equation 7
R
l
w (8)
and substituting equations (6) and (8) in equation (4), give
R
lS
V
3
3
(9)
Or
3
3
S
VR
l
(10)
Once l is known, w and other required parameters can be
computed from the above set of equations
2.3 Water Backup Surface Area
Seepage surface area (see Figure 2) is a function of wetted
perimeter and channel length
2
lP
SSA
(11)
Where, SSA is seepage surface area, P is wetted perimeter (m)
and l is length of water backup (m)
)
3
8
(
2
w
d
wP
(12)
Where w is width (m) and d is depth (m) of water backup
Substituting P from 12 into equation 11,
2
)
3
8
(
2
l
w
d
wSSA
(13)
Evaporative surface area (ESA) is a function of channel length
(m) and width (m)
3
2 lw
ESA
(14)
2.4 Precipitation
The volume of precipitation falling on the detention pond
during a given time step is calculated as:
(15)
Where Vpcp is the volume of water added to the detention pond
by precipitation during the time step (m3
of water), Rstep is the
amount of precipitation falling on a given time step (mm of
water), and ESA is the evaporative surface area of the
detention pond (ha).
2.5 Evaporation
The volume of water lost to evaporation on a given time step
is calculated as:
(16)
Where Vevap is the volume of water removed from the
detention pond by evaporation during the time step (m3
of
water), ε is an evaporation coefficient, E0 is potential
evapotranspiration for a given time step (mm of water), and
ESA is the evaporative surface area of detention pond (ha).
2.6 Seepage
The volume of water lost by seepage (assuming uniform
pressure gradient along the seepage surface area and gravity
drainage) through the bottom of the reservoir on a given time
step is calculated as:
(17)
Where Vseep is the volume of water lost from the water body by
seepage (m3
of water), Ksat is the effective saturated hydraulic
conductivity of the creek/river bottom (mm/hr), and SSA is the
seepage surface area of detention pond (ha).
2.7 Outflow
The volume of outflow may be calculated using one of three
different methods: measured outflow, controlled release rate
from weir (circular and rectangular weirs only), stage-
discharge relationship.
2.7.1 Measured Outflow
When measured outflow is chosen as the method to calculate
detention pond outflow, a file with the outflow rate from the
detention pond for every time step should be provided. The
volume of outflow from the detention pond is then calculated
as:
(18)
Where Vflowout is the volume of water flowing out of the
detention pond during the time step (m3
), ∆t is time step and
qout is the outflow rate (m3
/s).
4. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
_______________________________________________________________________________________
Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 660
2.7.2 Controlled Release Outflow
When the outflow method is chosen as the controlled release
outflow, the water release rate is computed using one of the
two weir options (rectangular weir or circular weir (orifice)).
If rectangular weir is chosen, discharge through the weir is
calculated as [9, 10]
(19)
(20)
Where, Vflowout is the volume of water flowing out of the
detention pond during the time step (m3
), dtpcdis is the
discharge coefficient for the rectangular weir, dtp_totwrwid is
total weir width of detention pond (m) and qdepth is depth of
flow in the weir (m), dtp_parm is detention pond outflow
hydrograph shape parameter, flowin is volume of water inflow
to the detention pond (m3
), ch_sl is the channel slope in
fraction and idt is modeling time step.
If circular weir is chosen, discharge through the weir is
calculated as
(21)
(22)
(23)
Where, Vflowout is the volume of water flowing out of the
detention pond during the time step (m3
), dtpcdis is the
discharge coefficient for the circular weir/orifice, warea is the
area of cross section of weir (m2
), diaweir is the diameter of
the orifice (m) and watdep is depth of water in the weir (m),
qdepth is depth of flow in the weir (m), dtp_depweir is the
depth of circular weir (m). For partially submerged weir,
depth, width and flow calculations are computed by making
necessary changes in the above equations.
2.7.3 Stage Discharge Relationship
Apart from the physically based algorithm developed for
routing flow through detention pond, stage-discharge
relationship is provided as one of the options. For using stage-
discharge method, the relationship between inflow and
outflow of the detention pond in question should be provided.
The relationship can be linear (described by a coefficient and
an intercept), logarithmic (a coefficient and an intercept),
polynomial (one or more depending on the degree of
polynomial and an intercept [e.g. two coefficients and an
intercept are required for a second degree polynomial]),
exponential (a coefficient and an exponent) or a power
function (a coefficient and an exponent). The relationship that
most closely fits the outflow hydrograph for a given inflow
hydrograph for the study area should be accepted. More
information on the stage-discharge relationships are provided
in Table 1.
Table -1: Stage-discharge relationships for detention pond
Relation-
ship
Form
Data needed
Coeffi-
cient
Inter-
cept
Expo-
nent
Linear Y=AX+B A B
Logarithmic Y=A Ln(X)+B A B
Exponential Y=A eBX
A B
Polynomial Y=AX2
+BX+C A,B C
Power Y=AXB
A B
2.8 Model Configuration for Detention Pond
A detention pond in general is built across a creek/river. It
drains water from all upstream areas. Therefore, in terms of
configuration it is analogous to a reservoir. The detention
pond can be configured to become operational in the middle of
a simulation period (e.g. in a simulation of 1981-2000 we can
have detention pond from 1995) to reflect construction dates.
If available the physical characteristics of the pond need to be
entered; if not, the algorithm developed will use model default
values based on City of Austin Environmental Criteria manual
[2]. The pond can receive direct precipitation, seep water
through the bed and evaporate water from its surface.
Presently rectangular weir and orifice are included for outlet
structures (Figure 1). The outlet can be in multiple stages
(vertically) for control of different storm events.
2.9 Data Availability
A Digital Elevation Model (DEM) with 0.3 meter (1 foot)
resolution was prepared by City of Austin for watershed
delineation. Soil data was obtained from Natural Resources
Conservation Service (NRCS) Soil SURvey GeOgraphic
(SSURGO) database [11]. A land cover map of the study area
for the year 2003 was prepared by City of Austin through
aerial survey. The watershed was divided into 4 sub-basins
based on the delineated stream network, and 36 HRUs based
on land cover, soil and slope combinations (Figure 5). The
5. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 661
dominant soils are fine textured (proportion of clay+silt > 65
%) shallow soils underlain by karstic rocks. Most of the soils
are classified as hydrologic soil groups C and D. The
dominant land cover is undeveloped (70 %), which includes
small residential structures and roads. Golf course/pasture (18
%) and residential (12 %) are other dominant land covers in
the watershed. The main channel in the LGA watershed is
highly ephemeral, having no stream flow for more than 70% -
80% of time during the test period. Rainfall data at 1 minute
interval recorded at a weather station near the watershed outlet
was collected, and then aggregated to 15 minute interval. Flow
calibrated LGA watershed model setup was used for testing
detention pond algorithm.
Fig-3: Study area-LGA watershed
3. RESULTS AND DISCUSSION
Monitored outflow data from a detention pond is not available
to validate the developed algorithm. Instead the flow
calibrated LGA watershed (from a previous study) was used as
a hypothetical case study to simulate the detention pond
performance. Flow results from the outlet of LGA watershed
for year 2004 (annual precipitation about 1318 mm) were
assumed to flow through a detention pond with two different
outlet structures namely a stepped rectangular weir and
circular weir (or orifice) (Figure 1). Year 2004 was one of the
wettest years for Austin and therefore the runoff from that
year offered a good data set to test the detention pond
algorithm. The outflow from each case corresponding to
inflow was plotted to analyze the behavior of the detention
pond algorithm and to check whether the algorithm is
performing as is expected. From the analysis, we see that the
detention pond algorithm is mitigating the hydrograph peaks
and delay the recession which is expected from the
functionality of the BMP in reality. In addition, it makes sense
from the results that the detention pond algorithm describing
multiple outlets (weirs with 2 or more stages) pass more water
through the structure at a given time than single stage weir
outlet (Figure 4 and Figure 5). In addition, the pattern of
detention pond outflow results looks similar to some of the
published results from previous studies [12-16]. Therefore, it
appears that the developed algorithm for the detention pond is
working well.
Fig-4: Flow through a detention pond with rectangular weir
Fig -5: Flow through a detention pond with circular weir
4. CONCLUSIONS
Texas AgriLIfe Research in collaboration with City of Austin
is developing modeling tools in SWAT to simulate urban and
urbanizing watersheds at sub-hourly scale. As a part of this
project, modeling tools are developed to simulate structural
stormwater Best Management Practices (BMPs). One such
BMP is detention pond. This paper describes the development
of a detention pond modeling tool, testing and integration of
the tool in Soil and Water Assessment Tool (SWAT) model.
The integrated algorithm was tested with a previously
modeled and flow calibrated LGA watershed in Austin, Texas,
USA.
Hypothetical detention pond systems were modeled in LGA
and the results were analyzed to check whether the algorithm
developed is functioning well without programming and
logical errors. From the results obtained it appears that the
detention pond algorithm is functioning well. Detention pond
captures water and performs a controlled release and therefore
helps to mitigate the flood peaks and flow velocity in urban
streams. The results of hypothetical case study of LGA
watershed mimicked the expected functionality of detention
ponds. The detention pond modeling tool developed could be
6. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 662
used a) to evaluate the functionality of individual detention
ponds b) to analyze the benefits of such structures at
watershed or higher scales and c) use them as design tools.
ACKNOWLEDGEMENTS
The authors wish to thank City of Austin, TX, USA for
providing data for the study.
REFERENCES
[1]. Maine Department of Environmental Protection. (2006).
Stormwater Management for Maine, Maine Department of
Environmental Protection, Augusta, Maine. (No.
DEPLW0738).
[2]. City of Austin, TX (2011). Environmental Criteria
Manual American Legal Publishing Corporation, Cincinatti,
OH.
[3]. California Stormwater Quality Association. (2003).
California Stormwater BMP Handbook-New Development
and Redevelopment (TC-12). Menlo Park, CA.
[4]. Jaber, F.H. and Shukla, S. (2005). “Hydrodynamic
modeling approaches for agricultural stormwater
impoundments.” J. of Irr. and Drain. Eng., 131(4): 307-315.
[5]. Jaber, G.H. and Shulka, S. (2007). “Accuracy of
Hydrodynamic modeling of flood detention reservoirs.” J.
Hydrol. Eng., 12(2): 225-230.
[6]. Emerson, C., Welty, C., and Traver, R. 2005. Watershed-
Scale Evaluation of a System of Storm Water Detention
Basins Journal of Hydrologic Engineering, 10(3):237-242.
[7]. Taur, C., Toth, G., Oswald, G., and Mays, L. (1987).
Austin Detention Basin Optimization Model Journal of
Hydrologic Engineering, 113(7):860-878.
[8]. Jeong, J., Kannan, N., Arnold, J., Glick, R., Gosselink, L.
and Srinivasan, R. (2010). “Development and integration of
sub-hourly rainfall-runoff modeling capability within a
watershed model.” Water Resour. Manage., 24(15), 4505-
4527.
[9]. Chow, V.T., 1973. Open Channel Hydraulics, McGraw
Hill International Edition.
[10]. Horton, R.E., 1907. Weir experiments, coefficients, and
formulas (second edition).
[11]. Soil Survey Staff, Natural Resources Conservation
Service, United States Department of Agriculture. Soil Survey
Geographic (SSURGO) Database for [Survey Area, State].
[12]. McCuen, R.H., (1974). “A regional approach to urban
storm water detention.” Geophysical Research Letters, 1(7),
321-322.
[13]. Nix, S.J. and Durrans, S.R., (1996). “Off-line stormwater
detention systems”, J. Am. Water Res. Assn. 32(6), 1329-
1340.
[14]. Hathaway, J.M., W.F. Hunt, and A. Johnson. (2007a).
Morehead Dry Detention, Final Report – Stormwater
Treatment Capabilities. Report from Department of Biological
and Agricultural Engineering-North Carolina State University
to City of Charlotte Stormwater Services, Charlotte, NC.
[15]. Hathaway, J. Hunt, W.F. and Johnson, A. (2007b).
University Executive Park Dry Detention Basin-Final
Monitoring Report. A report from Department of Biological
and Agricultural Engineering-North Carolina State University
to City of Charlotte Stormwater Services, Charlotte, NC.
[16]. Guo, J. C. Y., (2012). “Off-stream detention design for
storm water management.” J. of Irr. and Drain. Eng. 138(4),
371-376.
BIOGRAPHIES
Dr. Narayanan Kannan is a scientist with expertise in
assessment of large-scale water quality and quantity issues.
Presently he is analyzing water and energy usage in animal
production.
Dr. Jaehak Jeong is involved in development and application
of watershed simulation models such as SWAT and APEX for
hydrologic and water quality modeling and urban watershed
management.
Dr. Jeff Arnold is the scientist who developed SWAT model
and involved in further evolution of the model for various
emerging large-scale water quality and quantity problems.
Dr. Roger Glick is managing projects that protect urban
watersheds from flooding, stream erosion and other water
quality problems.
Ms. Leila Gosselink is involved in managing projects that
protect urban watersheds from flooding, stream erosion and
other water quality problems.
Dr. Raghavan Srinivasan is one of the developers of Soil and
Water Assessment Tool (SWAT) model and travels around the
world teaching SWAT workshops.