# Calculators

by Glenn M. Duffield, President, HydroSOLVE, Inc.

### Radius of Influence

Compute the radius of influence for a pumping well in a confined aquifer.

### Specific Transmissivity to Transmissivity Conversion

Estimate the transmissivity of an aquifer from the specific capacity of a well using exact or approximate formulas.

### Groundwater Mounding

Compute the maximum height of the water table beneath a circular or rectangular recharge area.

** See also:** Aquifer Testing 101