Hello everyone,

In the Groundwater - Surface Water Interactions help page, WEAP lists four options (direct inflow/outflow, wedge, Soil Moisture deep layer, and MODFLOW). I would like to use the Soil Moisture method where the deep soil layer provides baseflow to the river ; and calibrate the hydrology (Soil Moisture parameters) against observed streamflow.

Question: is it possible to represent groundwater withdrawals (pumping) within this configuration so that the withdrawals and any associated releases/returns are taken into account during the Soil Moisture calibration? If not what is the best alternative ?

Regards,

Guillaume

Guillaume,

Yes, all of these processes can interact with a common groundwater object and account for the pumping effects. In the Groundwater-Surface Water interactions of the river object, you can connect to a groundwater object by selecting it in the Data Tree. The catchments can also link to a groundwater object in the Soil Moisture method in the schematic by using a runoff/infiltration link. Lastly, you can draw a transmission link to a demand site in the schematic to simulate pumping. Now, when the volume in the groundwater object decreases due to pumping or increases due to percolation from the catchment, the surface-groundwater interactions react and change the streamflow in the river.

Hope this helps!
-Doug