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Basic Data/ Information Required for Hydrological Design General: Brief History of the Project giving salient features related to the Dam & spillway. Data Required Maps & Plans: Catchment Area Plans Scale 1:50,000 or 1:25,000 showing contour lines River course & tributaries to be shown with their names Location of all gauge & discharge sites Location of water storage structures intercepting the catchment Location of ordinary & SRRG raingauge stations in & around the vicinity of the catchment of dam site / G.D. site Location of nearby minor medium and major dams I-Flood Studies Following basic data are required for flood computation studies. Critical Flood Events: Rain fall & corresponding run off data for three or four flood events with date & time experienced in the catchment. Hourly gauge /discharge data at the nearest G & D station preferably on the same side of ridge Corresponding hourly rainfall data of rain gauge station including data & charts of SRRG located in the catchment or in the close vicinity of it If observed short duration data are not available, then respective sub zone reports published by CWC is to be referred & used Generalized P.M.P. (Probable Maximum Precipitation) Atlas for those river basins for which CWC have prepared & published Type of strata of bed and sides of Nalla /River Other Miscellaneous data like silt load etc. Drawings: L - Section of longest stream in the catchment for computing equivalent slope The suitable cross sections upstream and downstream of proposed dam axis including L- section with observed HFL marked with time & date II-Yield Studies Following basic data are required for Yield Studies Rainfall Data: Monthly rainfall data for all the rain gauge stations in and around the catchment for minimum 25 years. Run-off Data: Monthly Runoff Data at the location nearest gauge & discharge sites for maximum available period Monthly average data of all the water storage structures intercepting the catchment Monthly volumes of out flows from spillways of intercepting storage structures Monthly data of storage/spillway in nearby two tanks for comparison of data Steps For Computation of Yield Based on Observed Discharge Data at G&D Site: Mark the location of proposed Dam site on G. T. sheet. Mark the Catchment Area on G.T sheet & measure it by Planimeter or by any other method. Mark rain gauge stations in and around the catchment & construct "Thiessen's polygon" by drawing perpendicular bisectors to the lines joining rain gauge stations. Measure effective catchment area of each rain gauge Calculate influence factor for each rain gauge station Effective Catchment Area Influence Factor = ---------------------------- Total Catchment Area Collect monthly rainfall data (for monsoon period) of the considered rain gauge stations for minimum 25 - 30 years Arrange rainfall data month wise for monsoon period i.e. from June to October Compute weighted rainfall by multiplying monthly rainfall with Influence Factor Compute month wise total weighted rainfall (Pd)) in the catchment. Select nearby G&D site where discharge data for minimum 25-30 years are available. Collect runoff data (Rg) at G&D site for the months June to Oct. Compute month wise total weighted rainfall at G&D site (Pg) by repeating step a to i Compute month wise linear relation between weighted rainfall (Pg) & Runoff (Rg) at G&D Site by using "Linear regression analysis" Compute month wise linear relation between observed weighted rainfall at G&D site (Pg) and observed weighted rainfall at dam site (Pd) Pd= CPg + D Compute modified total weighted rainfall at dam site (Pm) using correlation computed in step n for each month Pm= CPg + D Compute runoff at dam site (Rd) using modified total rainfall at dam site (Pm) and correlation computed step n for each month . Rd= A Pm + B Convert runoff (Rd) to volume in cubic unit Yield(Y) = Rd * Catchment area Arrange yield (Y) in descending order Compute probability of every year from (N+1) years, where N is number of years for which runoff data are available. Considering yield at 50% dependability, the yield is calculated using formula. {M/(N+1).}x 100

Basic Data/ Information Required for Hydrological Design

I-Flood Studies Following basic data are required for flood computation studies.

Following basic data are required for flood computation studies.

II-Yield Studies Following basic data are required for Yield Studies

Following basic data are required for Yield Studies

Effective Catchment Area

Influence Factor = ----------------------------

Total Catchment Area

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Nodal Officer :Vimal Kumar Meena, S. E. (PMU), RWSRP, 5167550 Email : sepmu.wr-rj@rajasthan.gov.in.

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