Radius of Influence

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The radius of influence for a pumping well in an infinite confined aquifer is given as follows (Bear 1979):

R(t) = 1.5(Tt/S)^1/2

where R(t) is radius of influence [L], T is transmissivity [L²/T], t is time [T], and S is storage coefficient [dimensionless].

Radius of Influence Calculator

Transmissivity (T) =	[L²/T]
Storage Coefficient (S) =	[dimensionless]
Time (t) =	[T]

Use consistent units for the above input parameters. For example, enter T in m²/day and t in days to compute R(t) in m.

Radius of Influence Calculator developed by Glenn M. Duffield, HydroSOLVE, Inc.