dear users
please
if we do not have the head flow is it possible to use just the precipitations and how i have to use it for the hydrologique model.

Dear Bekhta,

You can use your precipitation data as water supply to your model through a hydrologic model that calculates streamflow runoff. In WEAP, the hydrologic models (there are a few options) are embedded in the catchment elements. The Hydrology chapter in the wEAP tutorial (available www.WEAP21.org/tutorial ) can get you started with two different options for hydrologic modeling.