This presentation summarizes key concepts related to hydrographs including:
1) A hydrograph shows the variation of discharge over time at a particular point in a river. It has three main components: the rising limb, peak, and recession curve.
2) Factors like area, slope, land use, and precipitation affect hydrograph shape.
3) A unit hydrograph represents the response of a watershed to 1 cm of direct runoff from rainfall of a given duration, and is used to estimate flood discharge from future rainfall.
4) Methods like superposition and S-curves are used to derive unit hydrographs from storm hydrographs and to estimate hydrographs for different rainfall scenarios.
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
Canal fall- necessity and location- types of falls- Cross regulator and
distributory head regulator- their functions, Silt control devices, Canal
escapes- types of escapes.
Topics:
1. Causes of Failures of Weirs on Permeable Foundations
2. Bligh’s Creep Theory
3. Lane’s Weighted Creep Theory
4. Khosla’s Theory
5. Application of Correction Factors
6. Launching Apron
WEIRS VERSUS BERRAGE
TYPES OF WEIRS
COMPONENT PARTS OF A WEIR
CAUSES OF FAILURE OF WEIRS & THEIR REMEDIES
DESIGN CONSIDERATIONS
DESIGN FOR SURFACE FLOW
DESIGN OF BARRAGE OR WEIR
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
Canal fall- necessity and location- types of falls- Cross regulator and
distributory head regulator- their functions, Silt control devices, Canal
escapes- types of escapes.
Topics:
1. Causes of Failures of Weirs on Permeable Foundations
2. Bligh’s Creep Theory
3. Lane’s Weighted Creep Theory
4. Khosla’s Theory
5. Application of Correction Factors
6. Launching Apron
WEIRS VERSUS BERRAGE
TYPES OF WEIRS
COMPONENT PARTS OF A WEIR
CAUSES OF FAILURE OF WEIRS & THEIR REMEDIES
DESIGN CONSIDERATIONS
DESIGN FOR SURFACE FLOW
DESIGN OF BARRAGE OR WEIR
Hydrology means science of water.
It is the science that deals with the occurance, circulation and distribution of water on the earth.
Hydrology is a broad subject of an inter-disciplinary nature drawing support from allied sciences.
Determining The Coefficient Of Tr, Α And River Length (L) Of Flood Runoff Mod...iosrjce
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of mechanical and civil engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in mechanical and civil engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
The Aerial Wetted Path of Geostationary Transmissionijceronline
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The Aerial Wetted Path of Geostationary Transmissionijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
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.
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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/
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
3. Content:3
Hydrograph
Components
Factors affecting Hydrograph
Unit Hydrograph
Assumptions, Derivation, Limitation of Unit Hydrograph
Application
Method of superposition
S – Hydrograph
Distribution Hydrograph
4. Introduction:
HYDROGRAPH :
A Hydrograph is a graph showing variation of discharge (Q) with time (T), at a particular point of stream
or river.
Discharge is usually expressed in cumecs or hectare meter per day and time is expressed in hours or days.
Discharged is plotted on y-axis and corresponding time is plotted on x-axis.
6. Component :6
Rising Limb : Also known as concentration curve – represent the increase in discharge due to gradual building
up of storage in channel and the catchment surface.
Peak of crest segment : The peak flow occur when the runoff from various parts of the catchment
simultaneously contribute amounts to achieve the maximum amount of flow at basin outlet.
Recession Limb : Extent from the point of infection at the end of the crest segment to the commencement of the
natural groundwater flow represent the withdrawal of water from the storage built up in the basin during the
earlier phase of hydrograph.
7. Factors affecting hydrograph :7
• Area
• Shape
• Slope
• Rock Type
• Soil
• Land Use
• Drainage Density
• Precipitation / Temp
• Tidal Conditions
8. Unit hydrograph :8
A unit hydrograph is a hydrograph representing 1 cm of runoff from a rainfall of some unit duration.
For example: A 3-hours unit hydrograph indicates the hydrograph which gives 1 cm depth of direct runoff
when a storm of 3-hour duration occurs uniformly over the catchment.
9. Assumptions of Unit hydrograph :9
• The excess rainfall has a constant intensity within the effective duration.
• The excess rainfall is uniformly distributed throughout the whole drainage area.
• The base time of the DRH (the duration of direct runoff) resulting from an excess rainfall of given
duration is constant.
• The ordinates of all DRH’s of a common base time are directly proportional to the total amount of direct
runoff represented by each hydrograph.
• For a given watershed, the hydrograph resulting from a given excess rainfall reflects the unchanging
characteristics of the watershed.
10. Limitations :10
The unit hydrograph theory cannot be applied to catchment areas greater than 5000 km sq.
The unit hydrograph theory cannot be applied to very small catchments with area less than 2 km sq.
This theory cannot be applied when the major portion of the storm is in the form of snow.
This theory is not very accurate. The accuracy obtained is + 10%.
A large number of unit hydrographs are required for a catchment because as the unit duration changes,
the unit hydrograph also changes.
11. Derivation:11
A unit hydrograph method is used for the estimation of the maximum flood discharge of a stream as well
as for developing a flood hydrograph corresponding to any anticipated rainfall.
In order to derive the unit hydrograph from storm hydrograph of same unit duration the following steps
are followed.
From the past records, select a hydrograph resulting from an isolated, intense, short duration rainfall over
the entire drainage basin.
12. 12
Separate the base flow (ground water flow) from the direct runoff.
Subtracting the ordinates of base flow from the total ordinates, find the ordinates of direct runoff.
Construction of unit hydrograph:
13. 13
Compute the depth of direct runoff as under.
Depth of direct runoff = Volume of the direct
runoff
Area of the drainage basin
=(∑O*t*3600) m^3
(A*10^6) m^2
= 0.36∑O*t cm
A
Where,
∑O = Sum of direct runoff ordinates in cumec
T = time interval in hours between the successive ordinates.
A = Area of drainage basin in square kilometers.
By dividing each of the direct runoff by the depth of direct runoff, the ordinates of unit hydrograph are
obtained.
Ordinates of unit hydrograph = Ordinate of
direct runoff
Direct runoff in cm
14. Application :14
Once a unit hydrograph for a duration try has been developed for a basin, the storm hydrograph for that
basin for any other storm of different intensity but the same duration can be easily developed.
To draw maximum flood hydrograph for the design of spillways.
It can be used for flooding and flood warning based on the observed rainfall in the basin.
To determine runoff from a storm of unit duration.
16. Method of superposition.16
If a unit hydrograph is available and it is desired to estimate a unit hydrograph of nD-hr UH where, n is
an integers which can be easily detremine by superposing n-UH with each graph separated from the
previous D-hr UH.
18. S – Hydrograph :18
S-Hydrograph or S-curve is a hydrograph that is produced by a continuous effective rainfall at a constant
rate for indefinite period.
It is continuous rising curve, in the form of letter S, till equilibrium is reached.
At the time of equilibrium, the S-curve will represent a runoff discharge given by:
Qo = ( A*100*100) * Ro = A . Ro cumecs
100*3600 36
Where ,
A = area of catchment in hectares.
Ro = constant rate of effective rainfall (cm/hour).
19. 19
If the catchment area A is in km^2, the discharge represent by S-curve at the time of equilibrium is given
by,
Qo = ( A* 1000*1000 )*Ro = 2.78 ARo cumecs
100*3600
Qo = 2.78 A cumecs
To
Ro = 1
To
where, To = unit time duration