Evaluation of Infiltration Equations Used in Surface Irrigation

by Aziz A. Eddebbarh, Colorado State Univ, United States,
Terence H. Podmore, Colorado State Univ, United States,



Document Type: Proceeding Paper

Part of: Planning Now for Irrigation and Drainage in the 21st Century

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: Computer models | Surface irrigation | Infiltration | Simulation models | Overland flow | Hydrologic models | Hydraulic models

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