Methods for Estimating the Drainable Porosity in Nonsteady Drainage Formulas

  • Weizhen Zhang
  • Yufang Zhang
Conference paper


The drainable porosity is one of the most important parameters for subsurface drainage design. At present time in most drainage formulas the specific yield is taken to be a constant value. As the existing concepts of specific yield differ greatly, the methods for estimating this parameter also vary.


Hydraulic Conductivity Water Table Specific Yield Water Table Depth Water Retention Curve 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • Weizhen Zhang
    • 1
  • Yufang Zhang
    • 1
  1. 1.Wuhan Institute of Hydraulic and Electrical EngineeringWuhan, HubeiChina

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