In order to find the piezometric pressure, we need the elevation of the bottom of the well casing from datum. The ground surface elevation, static and pumping water level were given as well as the well depth. Can the bottom elevation be found from simple subtraction of the surface elevation from NAVD88 datum and the well depth?
By bottom of the well casing, do you mean the top of the screened interval? Otherwise unless the bottom of the borehole is in consolidated rock (hardrock), the bottom of the casing would also be the bottom of the well.
Yes, You will get elevation of bottom of the well casing by simple subtraction of the surface elevation with depth of well ( depth upto bottom of casing) .
Hello Em Miran,
normally you will run at least a natural Gamma-ray log where the end of the casing is marked by a strong increase in activity.
regards
Rainer
It depends, if it is hanging or full casing.
If it's full casing then the bottom elevation is the depth of the well.
If the casing rests on the bottom of the well, the bottom casing refers to the depth of the well. Thus, the bottom part of the casing can be found by subtracting the well depth from surface elevation of the well.
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