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Soil Science Society of America Journal Abstract -

A Numerical Solution of the Differential Equation of Flow for a Vertical Drainage Problem1

 

This article in SSSAJ

  1. Vol. 20 No. 4, p. 443-447
     
    Received: Aug 31, 1955


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doi:10.2136/sssaj1956.03615995002000040001x
  1. Paul R. Day and
  2. James N. Luthin2

Abstract

Abstract

The drainage rate of a uniform soil overlying a continuous gravel substratum is difficult to predict because of the fact that the soil moisture tension and the capillary conductivity of the soil vary with the water content. Richards' differential equation of flow furnishes a theoretical basis for analysis. The equation can be solved numerically by finite differences when the capillary conductivity and the water content have been determined at various values of the soil moisture tension. An illustration and experimental test of the method are given for the drainage of a column of fine sand.

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