• Cornelis B. Vreugdenhil


Consider the flow of groundwater in a more or less horizontal porous layer of soil (Fig. 7.1). The mass balance for a column of soil is similar to that for a river:
$$\frac{{\partial a}}{{\partial t}} + \frac{\partial }{{\partial x}}\left( {au} \right) = w/n$$
$$\begin{array}{*{20}{c}} {a = thickness\;of\,the\,water\,layer\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {u = flow\,velocity\,averaged\,over\,the\,layer\,\,\,\,\,\,} \\ {w = ra\inf all\,in\,volume\,per\,unit\,surface\,area} \\ {n = porosity\,of\,the\,soil\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \end{array}$$
It has been assumed that rainfall reaches the groundwater layer very quickly; temporary storage in the unsaturated soil above the groundwater layer is not taken into account.


Permeability Porosity 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • Cornelis B. Vreugdenhil
    • 1
  1. 1.ENR Computer Services for TechnologyPettenThe Netherlands

Personalised recommendations