Pond, Lake, or Reservoir as an Irrigation Source on Agricultural Land in the Conterminous United States, 1992: National Resource Inventory Conservation Practice ISO02

This data set represents the estimated percentage of the 1-km grid cell that is covered by or
subject to the agricultural conservation practice (CPIS02), Pond, Lake or Reservoir as an
Irrigation Source (PLRIS) on agricultural land by county. Pond, Lake or Reservoir as an
Irrigation Source are described as an "inland body of water (fresh or salt) of considerable
size occupying a basin or hollow on the earth's surface, and which may or may not have
a current or single direction of flow." (U.S. Department of Agriculture, 1995) This data set
was created with geographic information systems (GIS) and database management tools.
The acres on which PLRIS'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.