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United States Department of Agriculture

Agricultural Research Service

Irrigation
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AnnAGNPS Pollutant Loading Model

K. Green BulletIrrigation

Abstract:

The irrigation module determines each day if an irrigation event takes place. If so, the depth of water applied is calculated as well as a first estimate of runoff (later revised in Soil_Moisture) and the net amount of water entering the soil. Several types of furrow, sprinkler, and other irrigation methods are considered as well as three types of scheduling: automatic, which is triggered by soil moisture falling below a threshold; manual interval, where a specified amount of water is applied on a regular schedule; and manual irrigation on irregularly spaced dates. The occurrence of chemical irrigation is also tracked.

Contact:

Tom Spofford or Dave Garen


Last Modified: 8/6/2004
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