Hydrological analysis for dams

Hydrological analysis for dams consists of the following components: 

·         Collection & Review of Previous Study Reports

·         Hydro -Meteorological  Data

­   Rainfall Data

-       Daily rainfall data

-       1-day annual maximum rainfall data

-       Hourly rainfall data

­   Discharge Data

-       Instantaneous peak discharge data

­   Evaporation Data

­   Sedimentation Data

·         Preliminary Desk study

·         Site Visit

·         Marking of Catchment Area

·         Determination of Catchment Parameters

­   Catchment area

­   Length of longest stream

­   Top & bottom elevation of longest stream

­   Longitudinal profile of longest stream

­   Curve number

·         Water Availability studies

­   Water availability with stream flow data

­   Water availability with stream flow data

·         Flow Duration Curve

·         Frequency analysis

­   1-day EV1

­   Log pearson type III

­   GEV

·         Intensity Duration Frequency Curve

·         Design Flood  Studies

­   NRCS Unit Hydrograph Method

-       Unit hydrograph

­   Input Parameters for Worksheet Model

-       Average precipitation

-       Return period

-       Time of concentration

-       n-coefficient

-       1-day to 24 hour rainfall conversion factor

-        Point to area reduction factor

-       Cutoff value

-       Time interval

­   Methodology For Worksheet Model

·         PMP/PMF Studies

­   Data Required for Estimation of Standard PMP

­   Probable maximum precipitation (PMP)

­   Meteorological Analysis

·         Flood Routing Studies

­   Purpose of flood routing

­   Input data

-       Elevation-area-capacity

-        Maximum conservation level

-       Inflow flood hydrograph (From design flood worksheet)

­   Methodology For Worksheet Model

·         Sedimentation Studies

­   Measurement methods for sediment

-       Direct measurement

-        Mathematical models

­    Models for sedimentation studies

·         Reservoir Operation Studies

­   Input data

-       Elevation, area, capacity data

-       Evaporation data

-       Water demand

-       10-daily Inflow data

-       Maximum conservation level

-       Storage at maximum conservation level

-       Dead storage level

-       Dead storage capacity

­   Methodology For Worksheet Model

-       MIKE by DHI has different sediment transport modules for its software

-       HEC RAS sediment transport module (free of cost)

-       HEC-6 (free of cost)

·         Dam Break Studies

­   Components

-                 Breach parameters

-       Downstream flood wave propogation

·         Design Flood

­   By Rational Method

-       Assumptions for using rational formula

-       Input parameters