* Although the U.S. Geological Survey collects data every five years, there are a few years of delay in releasing the data in order to fully process it.
Years Available: 2005, 2010, 2015
Permanent Link: http://data.sagepub.com/sagestats/6620
General Notes: *Median value gives the value for the "average" county for this metric, the 50th percentile of all counties reporting data. **Water that is applied by an irrigation system to assist crop and pasture growth, or to maintain vegetation on recreational lands such as parks and golf courses. Irrigation includes water that is applied for pre-irrigation, frost protection, chemical application, weed control, field preparation, crop cooling, harvesting, dust suppression, leaching of salts from the root zone, and conveyance losses. Irrigation by means of flood, furrow, or gravity. Flood irrigation is the application of irrigation water in which the entire soil surface is covered by ponded water. Furrow is a partial surface-flooding method of irrigation normally used with clean-tilled crops in which water is applied in furrows or rows of sufficient capacity to contain the design irrigation stream. Gravity is an irrigation method in which water is not pumped, but flows in ditches or pipes and is distributed by gravity. Also known as "flooding."