Atmospheric pressure Even though it is convention to use gauge pressure in the calculation of hydraulic head , it is more correct to use total pressure -LRB- gauge pressure + atmospheric pressure -RRB- , since this is truly what drives groundwater flow .

Atmospheric pressure Even though it is conventional to use gauge pressure in the calculation of hydraulic head , it is more correct to use total pressure -LRB- gauge pressure + atmospheric pressure -RRB- , since this is truly what drives groundwater flow .
