Data View, Branch: Supply
and Resources \ Reservoir, Tabs: Inflow Local reservoirs by definition are modeled independently of river streamflow. For this reason, you must explicitly enter monthly inflows to local reservoir sources. The monthly inflows you enter should not include return flows from demand sites and wastewater treatment plants--WEAP will calculate the inflows from return flows separately. You may specify the inflow using the Water Year Method, the Read from File method, or with an expression. See Specifying Inflow for details.
Entered on: Data View, Branch: Supply
and Resources \ Reservoir, Tabs: Inflow