GENERAL OBJECTIVE: Assessment of proposed dam site technical feasibility based on the
hydrological characteristics of watershed, and on available data of climate patterns and flow
regime, through the use of hydrologic models to perform the necessary hydrologic analyses.
WATERSHED CHARACTERISTICS
Basin delineation and computation of basin parameters based on available elevation,
topographic map, and aerial photography data.
CLIMATE AND FLOW REGIME
Analysis of precipitation data (mean areal rainfall by Thiessen polygons or isohyets or both),
Analysis of extreme precipitation data (maximum and minimum)
Analysis of stream flow records (mean, maximum and minimum flows)
Process data to fill in missing data or augment stream flow records if necessary
Correlation between rainfall and discharge data
DAM SITE CHARACTERISTICS
Develop elevation-area-volume curves
Required reservoir capacity to assure adequate water for irrigation or municipal water supply or
hydropower (drought conditions specially considered). This could be done by the old Rippl
method or through the sequent peak algorithm or any other method.
WATER AVAILABILITY and WATER BALANCE
Compute the water balance based on water demands for municipal water supply, agriculture,
tourism, hydropower, etc. and water yield analysis or the variation of water production from
catchments.
FLOOD CONTROL
Maximum probable flood at proposed sites or expected flood flows over a spillway (probable
maximum flow - PMF).
Delineate floodplain extents of flood prone areas for communities