Processing math: 100%
Unconfined Aquifer System

Calculate the radial flow to a well in an unconfined aquifer system.


Solve the governing equation


1r∂∂r(rbK∂h∂r)=0

where b= constant saturated thickness of the aquifer
Subject to: h=hw at well radius, h=h0 at radius of influence

Conditions and Assumptions


  1. The aquifer is unconfined
  2. The aquifer has a seemingly infinite areal extent
  3. The aquifer is homogeneous and of uniform thickness over the area influenced by the test
  4. Prior to pumping, the piezometric surface is horizontal (or nearly so) over the area that will be influenced by the test
  5. The aquifer is pumped at a constant discharge rate
  6. The well penetrates the entire aquifer and thus receives water from the entire saturated thickness of the aquifer

Inputs

Output

 Value of pumping rate for input values:

   Qw =

 

  m3/s

     Qw =

 

  Litre/sec



  Table of Values: Head at radius, r

Graph


Drag over an area to zoom in on the chart. Double click to zoom out again.