Make groundwater level map 

I'm not sure I understand the question. There is one point where groundwater is discharging, a spring? Try the drain package as a point? Good luck!

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!

Should work if you substitute the metals for the groundwater levels. Does that make sense? Let me know if it doesn't work. Good luck!

@@alexandralutz7844 yes, you can make contour of any data. Like equal concentration, elevation, rainfall, humidity etc.

Hi Erika- these are specific to the data set being used as an example. Think of it as time steps 1, 2, and 3. Something like that. 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?

@@erikahansen2684 that should work! Let me know how it goes.

IDW is a choice for interpolation in ArcGIS, the program shown in the video. You can try both and compare.

@@alexandralutz7844 yes i did before , but which one is the best for mapping groundwater level i mean?

Hello - try this website alexandralutz.com/water-work-data-scarce/ Please let me know if it does not work. Thanks for your question!!

Try this, let me know if you have problems alexandralutz.com/files/