Irrigation Water Conveyance by Ditch and Canal on Agricultural Land in the Conterminous United States, 1992: National Resource Inventory Conservation Practice 428
This data set represents the estimated percentage of the 1-km grid cell that is covered by or subject to the 
agricultural conservation practice (CP428), Irrigation Water Conveyance by Ditch and Canal (IWCDC) on 
agricultural land by county.  Irrigation Water Conveyance by Ditch and Canal is described as "a fixed …