Hi Alexandra, what was the reason for subtracting the groundwater level from the land surface elevation for each phase? was it to determine the hydraulic head? Also, what is the purpose of adding the DEM file to the map?
The DEM is needed for land surface elevations when they have not been measured in the field or are otherwise not available. Yes, the reason to subtract is to determine hydraulic head. Hope this helps!
@@alexandralutz7844 Thanks for the reply! I have a DEM and data for the initial GWL, lowest GWL and highest GWL taken at wells on the site. I'm wondering if I can use the initial GWL as say phase 1, lowest GWL as phase 2 and highest GWL as phase 3?