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Lecture Notes for ESS 110 - Hydrology and Climate at UC-Merced (UC Merced)

Notes Information

Material Type:Class Note
Professor:Staff
Class:ESS 110 - Hydrology and Climate
Subject:Earth Systems Science
University:University of California-Merced
Term:Fall Semester 2008
Keywords:
  • Total Runoff
  • Infiltration Rate
  • Infiltration
  • Conductivity
  • In Front Of
  • In Front (of)
  • Following Equations
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Sample Document Text

  EnvE/ESS 110, Hydrology and Climate  1 Green-and-Ampt Example  Problem:  Using the Green-and-Ampt model determine the total runoff and infiltration from a  2hr  rainfall  event with a  1 0.5cmhr ?  intensity.  When does runoff begin?  The soil's saturated hydraulic conductivity is  1 0.044cmhr ? , initial moisture content before infiltration begins is 0.25, porosity is 0.50, and the pressure head  at the wetting front is  22.4cm? .  What's the infiltration rate at the end of the storm?    Solution:  The given parameters are 2 w thr= ,  1 0.5wcmhr ? = ,  1 0.044 s Kcmhr ? = ,  0 0.25? = ,  0.50? = , and  22.4 f cm? =? .  First, calculate the cumulative amount of water that has infiltrated by the time of ponding,    () () () ()() () 0 1 11 0.044 22.4 0.50 0.25 0.5 0.044 0.54 sf p s p p K Ft wK cmhr cm Ft cmhr cmhr Ft cm ??? ? ?? ??? = ? ?? ? ? = ? =   The time of ponding,  p t , is then calculated as    () 1 0.54 0.5 1.08 p p p ...

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