dear users
i have the head flow from 1990to 2016 and i have the précipitation (RCM 4.5) futur precipitation how can weap calcculate futur head flow .
all the best

Dear Bekhta,

To use the RCM 4.5 precipitation data, you will want to create a hydrology models in WEAP using catchments. The tutorial has a demonstration of two different hydrology models (simplified coefficient method and rainfall-runoff method) in the hydrology chapter. You can download the tutorial at www.WEAP21.org/tutorial.

Once you have added a catchment to your WEAP model, you will need to use the historic flow record AND historic weather data (esp precipitation and temperature) to calibrate your model so it produces a simulated flow that approximates your historic data for flow.

When you have a calibrated model, you can change the years (and initial conditions, if applicable) and use the RCP 4.5 climate data.