The document discusses hydrology and the runoff process. It defines runoff and describes its key components: surface runoff, groundwater flow, and direct precipitation over rivers. It explains the runoff process when rainfall occurs and factors that affect runoff like precipitation characteristics, catchment shape and size, topography, geology, and storage. The runoff cycle and its four conditions - end of dry period, start of rainfall, end of heavy rainfall, and after rainfall - are outlined. Finally, the document summarizes the rainfall-runoff process and definitions of related terms.
Stream flow representing the runoff phase of the hydrologic cycle is the most important basic data for hydrologic studies. Runoff is generated by rainstorms. Its occurrence and quantity are dependent on the characteristics of the rainfall event, i.e. intensity, duration and distribution. This module highlights about runoff components of the hydrological cycle.
Hydrological cycle- Meteorological measurements – Requirements, types and forms of Precipitation-Rain Gauges-Spatial analysis of rainfall data using Thiessen and Isohyetal methods Infiltration-Infiltration Index-Interception-Evaporation, Watershed, catchment and basin - Catchment characteristics - factors affecting runoff – Runoff estimation using empirical
Stream flow representing the runoff phase of the hydrologic cycle is the most important basic data for hydrologic studies. Runoff is generated by rainstorms. Its occurrence and quantity are dependent on the characteristics of the rainfall event, i.e. intensity, duration and distribution. This module highlights about runoff components of the hydrological cycle.
Hydrological cycle- Meteorological measurements – Requirements, types and forms of Precipitation-Rain Gauges-Spatial analysis of rainfall data using Thiessen and Isohyetal methods Infiltration-Infiltration Index-Interception-Evaporation, Watershed, catchment and basin - Catchment characteristics - factors affecting runoff – Runoff estimation using empirical
1. Distribution of Runoff
2. Hydrograph Analysis
a) Hydrograph & Unit Hydrograph
b) S - Hydrograph & Synthetic Unit Hydrograph
3. Computation of Design Discharge
a) Rational Formulae
b) SCS Curve Number Method
4. Flood Frequency Analysis
5. Flood Routing
Stream Gauging: Necessity; Selection of gauging sites; Methods of discharge measurement; Area-Velocity method; Venturi flume; Chemical method; weir method; Measurement of velocity; Floats Surface float, Sub–surface float or Double float, Twin float, Velocity rod or Rod float; Pitot tube; Current meter; Working of current meter; rating of current meter; Measurement of area of flow; Measurement of width - Pivot point method; Measurement of depth Sounding rod, Echo- sounder.
1. Ground Water Occurrence
2. Types of Aquifers
3. Aquifer Parameters
4. Darcy’s Law
5. Measurement of Coefficient of Permeability of Soil
6. Types of Wells
7. Well Construction
8. Well Development
Runoff is that portion of the rainfall or irrigation water which leaves a field either as surface or as subsurface flow. When rainfall intensity reaching the soil surface is less than the infiltration capacity, all the water is absorbed in to the soil. As rain continues, soil becomes saturated and infiltration capacity is reduced, shallow depression begins to fill with water, then the overland flow starts as runoff.
1. Distribution of Runoff
2. Hydrograph Analysis
a) Hydrograph & Unit Hydrograph
b) S - Hydrograph & Synthetic Unit Hydrograph
3. Computation of Design Discharge
a) Rational Formulae
b) SCS Curve Number Method
4. Flood Frequency Analysis
5. Flood Routing
Stream Gauging: Necessity; Selection of gauging sites; Methods of discharge measurement; Area-Velocity method; Venturi flume; Chemical method; weir method; Measurement of velocity; Floats Surface float, Sub–surface float or Double float, Twin float, Velocity rod or Rod float; Pitot tube; Current meter; Working of current meter; rating of current meter; Measurement of area of flow; Measurement of width - Pivot point method; Measurement of depth Sounding rod, Echo- sounder.
1. Ground Water Occurrence
2. Types of Aquifers
3. Aquifer Parameters
4. Darcy’s Law
5. Measurement of Coefficient of Permeability of Soil
6. Types of Wells
7. Well Construction
8. Well Development
Runoff is that portion of the rainfall or irrigation water which leaves a field either as surface or as subsurface flow. When rainfall intensity reaching the soil surface is less than the infiltration capacity, all the water is absorbed in to the soil. As rain continues, soil becomes saturated and infiltration capacity is reduced, shallow depression begins to fill with water, then the overland flow starts as runoff.
Short power point made by AS/A Level students with the aim of explaining Storm Hydrographs and the foundations of the Drainage Basin Hydrological Cycle.
Hydrology and irrigation engineering cel 303Gaurav Mittal
Topic of this power point presentation is INFILTRATION AND THEIR INDICES. In this presentation you will find the information related to infiltration and how to measure this phenomenon...
This document covers rivers from the CSEC Geography syllabus. It covers the water cycle, drainage basin, drainage density, drainage patterns, river processes, characteristics of rivers and river landforms
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.
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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.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
Presented at NUS: Fuzzing and Software Security Summer School 2024
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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
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Vaccine management system project report documentation..pdfKamal Acharya
The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
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.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
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/
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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.
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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.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
3. Definition of runoff
Portions of runoff
Runoff process
Surface runoff
Factors affecting runoff
Runoff cycle
Conditions of runoff cycle
Summary of Rainfall-Runoff process
4. Definition of Runoff
Runoff can be defined as the portion of the
precipitation that makes it’s way towards rivers
or oceans etc, as surface or subsurface flow.
Portion which is not absorbed by the deep
strata.
Runoff occurs only when the rate of
precipitation exceeds the rate at which water
may infiltrate into the soil.
5. Portions of Runoff
1. Surface runoff
2. Groundwater flow
3. Direct precipitation over the river stream.
6. Runoff Process
When rainfall occurs:
A part of rainfall/precipitation is intercepted by vegetation.
Some part is stored in depressions on the ground surface known as
depression storage (Sd), which later infilterates or evaporates.
Some part of rainfall is absorbed by the soil, the amount of which depends
upon the soil moisture condition at the time of percolation.
Now if the rain continues further;
The water starts infiltrating/percolating to the water table and if the rate of
rainfall or the rate at which the water is reaching the ground exceeds the
infiltration rate (f), resulting the surface detention (D).
This water flow overland and joins the rivers, lakes, streams, oceans, etc,
and is known as surface runoff.
7. One can say runoff as surface runoff.
1) The surface runoff is important for maximum flow.
2) Where as the ground water flow is important for
minimum flow.
3) Direct Precipitation over the river or stream is
negligible.
So for peak flow we are generally concerned with
surface runoff and therefore we can say runoff as
surface runoff.
8. Factors Affecting Runoff (Mod GargSK)
1. Precipitation characteristics,
2. Shape and size of the catchment,
3. Topography,
4. Geological characteristics,
5. Meteorological characteristics,
6. Character of the catchment surface,
7. Storage characteristics.
9. 1. Precipitation characteristics
It is the most important factor for runoff
Runoff depends on the type of the storm and it’s
duration, which causes precipitation.
Runoff depends on the intensity of rainfall.
More the rainfall, more will be runoff.
If the rainfall intensity is very less and it rains as light
showers then much of the water will be lost in
infiltration & evaporation resulting less runoff.
If precipitation is in case of snow then less runoff.
10. 2. Shape and size of the catchment
Runoff depends upon size, shape and location of the
catchment.
Generally more rainfall on smaller area resulting in
greater runoff.
Less runoff in larger catchments because due to
uniform rainfall over the entire area, thus only few
tributaries of the stream feed water to a main stream
during a particular storm.
12. A. Fan shaped catchment
All the tributaries are
approximately of the same size.
Gives greater runoff because
the peak flood from the
tributaries is likely to reach the
main stream approximately at
the same time.
13. B. Fern leaf catchment
The tributaries are generally of
different lengths and meet the
main stream at the regular
intervals.
Such a narrow catchments the
peak flood intensity is reduced
since discharges are likely to be
distributed over a long period of
time.
14. 3. Topography
Runoff depends on surface smoothness and
slope.
If slope is steep, flow will be quick and less
evaporation and absorption, resulting greater
runoff.
If the catchment is in mountainous area and
on the windward side of the mountain, then
more rain fall resulting more runoff.
15. 4. Geological characteristics
It is one of the important factor.
It includes the type of surface soil, subsoil, type of
rock and their permeability characteristics.
If soil and subsoil is porous, seepage will be more
resulting reduction of the peak flood.
If the surface is rocky, then absorption will be nil
resulting more runoff.
If rocks have fissures, are porous in nature, have lava
funnels water will be lost resulting less runoff.
16. 5. Meteorological characteristics
Runoff may also be affected by temperature,
wind and humidity.
If temperature is low and ground is saturated
then runoff will be greater.
If temperature is high and greater wind
velocity give rise to greater evaporation loss
and resulting in less runoff.
17. 6. Character of the Catchment surface
Runoff depends upon the surface conditions like
drained, undrained, natural or cultivated.
If the surface has no natural drainage then absorption
loss will be more.
If more area of a catchment is cultivated resulting
less runoff.
Vegetal cover reduces the runoff in smaller storms.
No vegetal cover reduction in bigger storm.
18. 7. Storage characteristics
The artificial storage such as dams, weirs, etc
and natural storage such as lakes, ponds, etc
tend to reduce the peak flow.
They also give rise to greater evaporation
losses.
19. Runoff Cycle
It is a part of hydrological cycle
The part between the precipitation from the
atmosphere over land areas and it’s
subsequent discharge through streams
channels.
20. Conditions of Runoff Cycle
1. End of dry period
2. Shortly after beginning of rainfall
3. Near the end of isolated heavy rainfall
4. After the end of rainfall
21. 1. End of dry period
At the end of dry period and just beginning of
heavy rainfall all the surface and channel
storage gets depleted (dried) expect from
lakes, reservoirs and ponds resulted from the
previous rains.
The only source of stream flow is the ground
water flow entering the river channel.
22. 2. Shortly after beginning of rainfall
Shortly after beginning of rainfall and before
interception, depression storage have been satisfied.
The stream flow intercepted by vegetation and
buildings can’t contribute to runoff.
This intercepted water is eventually returned to the
atmosphere through evaporation.
At this stage, a part of precipitation falls directly on
the stream which gives an immediate increment to
stream flow.
23. 3. Near the end of isolated heavy rainfall
After many hours of heavy rainfall virtually all depression storage
and interception requirements gets filled up.
The soil moisture deficiency is also satisfied to a considerable
extent.
Infiltration rate is near the minimum.
Similarly the flow into the filled depression is essentially balanced
by over land flow and infiltration.
Thus at this stage over land flow mainly contribute to stream flow.
Sub surface flow also contributes to stream flow.
24. 4. After the end of rainfall
When rain and overland flow ceases (stops), the stream
flow consists of only base flow and channel storage.
Evaporation takes place quite from soil moisture.
Transpiration also takes place from vegetative cover.
Water from depression storages also continues to
infiltrate.
Also the gravity water still not drained up to the water table
continues its downward journey to join water table.
25. Summary of Rainfall-Runoff Process
When a rain starts falling, it is first of all intercepted by buildings, trees,
and other objects, which prevent it from reaching the ground. This
quantity is known as rainfall interception.
Since this quantity is generally very small, it is not of much importance
for intense rains; but many a times, large portions of lighter rains are
disposed of in this manner.
The difference between the total rainfall and that which is intercepted is
called ground rainfall.
when the rainfall rate exceeds the interception rate, water starts
reaching the ground and infiltration into the sub soil starts. The
maximum rate at which the soil in a given condition can absorb water is
known as its infiltration capacity.
26. The excess rainwater gets collected into the innumerable small and
large depressions existing in the basin, filling them to their overflow
levels. This quantity is known as depression storage.
All this storage is either evaporated or used by vegetation, or later
infiltrates into the soil. None of it appears as surface runoff.
If after the depression storage is filled, the rain intensity (p) continues to
exceed the infiltration capacity of the soil (f), the difference appears as
rainfall excess, which initially accumulates on the ground as surface
detention (D), and then flows as overland flow on the basin surface
before entering a stream channel.
The water that reaches the stream channel of a basin in this manner is
called surface runoff (SRO) or direct runoff (DRO).
27. The surface runoff can, therefore, occur only from those storms, which
can contribute to excess rainfall, and are simply not dissipated in fulfilling
the interception, depression storage, and infiltration needs of the basin.
Hence,
Excess Rainfall = Rainfall – Interception - Depression storage –
Infiltration
The sum total of interception and depression storage for a basin is
usually called the initial loss or basin loss or initial basin recharge.
Excess rainfall can therefore be represented as:
Excess rainfall = Rainfall – Initial Basin loss – Infiltration
The sum total of initial basin loss and infiltration, is called potential
infiltration.
28. Since for intense rains, the initial loss is very small as compared to
excess rain, it is usually ignored in hydrological analysis of such rainfalls;
or is considered to be included in the infiltration itself.
The excess rainfall is, thus, represented as:
Excess Rainfall = (Rainfall – Potential Infiltration
The rain that falls in the beginning of a storm before the depression
storage is completely filled is called the initial rain,
and
the rain that falls near the end of the storm at a rate less than the
infiltration capacity is called the residual rain.
The intervening period is the net supply interval. The infiltration occurring
after the net supply interval is called the residual infiltration.
29. Runoff and surface runoff are two different terms and should not be
confused.
Runoff or Discharge or the Stream flow includes all the water flowing
in the stream channel at any given section.
While
Surface Runoff or Direct Runoff includes only the water that reaches
the stream channel without first percolating down to the water table.
Yield of a drainage basin is same as runoff, with the only difference
that it is expressed over long periods (M.m3
/year),
while
Runoff is expressed for short periods (m3
/sec or m3
/hr).