I have created the watershed for a proposed dam site point using SRTM 90m DEM. Now my task is to create a reservoir or pondage where water would be collected from the watershed.
Above a watershed can be seen with a red line on which Dam can be created. A dam also has a reservoir where water is collected and it is always inside the watershed, now problem is to delineate that reservoir.
Practically, reservoir should be in lowest elevation (flat area), so can we create such using Dem data.