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GENERAL DEFINITIONS Acre-foot (Acre-Inch) - the quantity of water necessary to cover 1 acre to a depth of 1 foot, or 43,560 cubic feet = 1.233.4 cubic meters, 325.851 gallons, or 1,233,000 liters. An acre-inch is the quantity of water needed to cover 1 acre to a depth of 1 inch, or 3.630 cubic feet. 102.78 cubic meters, 27,154 gallons. or 102.750 liters. Application System - all those facilities. operations and management required to apply water to crops in the field. Aquifer - a subsurface water-bearing stratum (unit) that transmits water readily enough to supply useful quantities to springs or wells. Artificial Recharge - man induced additions of water to an aquifer through injection wells. surface spreading, or other means in areas overlying an aquifer. Automation - automatic water-control mechanisms which start or stop power units at predetermined times or in response to predetermined soil moisture or climatic conditions. Helps prevent excessive water application. Brackish/Saline Waters - waters less than 1000 mg/L of total dissolved solids (TDS) are generally considered fresh and suitable irrigation waters for most crops; waters with 1000-3000 mg/L are brackish (moderately saline), while waters over 3000 mg/L are considered saline. There are wide differences in the relative tolerance of crops to salinity and the salinity ranges cited here are only general averages not specific for any plant or crop. Many factors other than relative salinity also playa part in water suitability for irrigation. Conjunctive Use - combined or coordinated management and use of both surface and ground water resources as an integrated system. x I I I I I I I I I I I I I I I I I I I