Permeability and Seepage Flow - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 158

Figure 6.21 Vertical section through well, drawdown curves after 11 h of pumping

The drawdown h(r,t) of the water table due to a pumping rate Q P around a well as a

function of distance r from the well's axis and time t in a homogeneous aquifer with
isotropic permeability k can be calculated as follows (Theis 1935):

Δ

(6.67)

where

is the so-called well function with