Evaluation of Infiltration Equations Used in Surface Irrigationby Aziz A. Eddebbarh, Colorado State Univ, United States,
Terence H. Podmore, Colorado State Univ, United States,
Abstract: Computer simulations of an irrigation event were conducted using 6 full hydrodynamic models. All 6 models used the same surface flow equations and a different infiltration component. The surface-subsurface flow model, for which the infiltration component is based on a solution to the Richards' equation was used as a basis of comparing the other models. The infiltration component based on the W.H. Green-G.A. Ampt assumption gave results in close agreement with those obtained with the surface-subsurface flow model, was as easy to program as the A.N. Kostiakov or modified Kostiakov infiltration function, and was able to incorporate the soil hydraulic properties and the variation of the ponding depth during the whole irrigation event. Such model can be a useful tool in surface irrigation modeling.
Subject Headings: Terrain models | Infiltration | Surface irrigation | Mathematical models | Computer models | Simulation models | Hydrologic models
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