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United States Department of Agriculture

Agricultural Research Service

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AnnAGNPS Pollutant Loading Model

K. Green BulletIrrigation


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.


Tom Spofford or Dave Garen

Last Modified: 8/6/2004
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