Irrigation Canals or Laterals on Agricultural Land in the Conterminous United States, 1992: National Resource Inventory Conservation Practice 320

This data set represents the estimated percentage of the 1-km grid cell that is covered by or subject to the
agricultural conservation practice (CP320), Irrigation Canals or Laterals on agricultural land by county. An
Irrigation Canals or Laterals (ICL) is a "permanent channel constructed to convey irrigation water from the
source of supply to one or more irrigated areas." (U.S. Department of Agriculture, 1995) This data set was
created with geographic information systems (GIS) and database management tools. The acres on which
ICL's are applied were totaled at the county level in the tabular NRI database and then apportioned to a raster
coverage of agricultural land within the county based on the Enhanced National Land Cover Dataset (NLCDe)
1-kilometer resolution land cover grids (Nakagaki, 2003). Federal land is not considered in this analysis
because NRI does not record information on those lands.