From the Abstract: "In 2018, 40 percent of all water applied to irrigated cropland came from an off-farm water source. Irrigation districts, ditch companies, acequias, and other water delivery organizations use infrastructure such as canals, reservoirs, and turnouts to transport, store, and deliver off-farm water to farms and ranches. This infrastructure is a critical part of an organization's ability to meet the water needs of irrigated agriculture. The U.S. Department of Agriculture's 2019 Survey of Irrigation Organizations is a nationally representative review of the water management organizations that deliver water to farms or influence on-farm groundwater use. This report leverages these survey data to provide an overview of the vital irrigation infrastructure owned and managed by water delivery organizations."
Economic Brief Number 32
U.S. Department of Agriculture, Economic Research Service: https://www.ers.usda.gov/