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usually expressed in cubic feet per second per square mile. See also Yield, Firm; Yield, Perennial; <br />Yield, Safe. (Rice (1991)) <br />Yield, Average Annual <br />The average annual supply of water produced by a given stream or water development. (Rice (1991)) <br />Yield, Firm <br />The maximum annual supply of a given water development that is expected to be available on <br />demand, with the understanding that lower yields will occur in accordance with a predetermined <br />schedule or probability. (Rice (1991)) <br />Yield, Perennial <br />The amount of usable water of a groundwater reservoir that can be economically withdrawn and <br />consumed each year for an indefinite period of time. It cannot exceed the natural recharge to that <br />groundwater reservoir and ultimately is limited to the maximum amount of discharge that can be <br />utilized for beneficial use. (Rice (1991)) <br />Yield, Safe <br />With reference to either a surface or groundwater supply, the rate of diversion or extraction for <br />consumptive use which can be maintained indefinitely, within the limits of economic feasibility, under <br />specified conditions of water supply development (see also Yield, Perennial). (Rice (1991)) <br />Yield, Water Right <br />The volume of water diverted by a water right. Yield may be expressed as an average for a period of <br />years (average yield) or as the yield of one selected year representing the lowest or critical amount of <br />water provided (critical year yield). Yield also may refer to diversion at the headgate (headgate yield) <br />or at the farm turnout where it is applied to irrigation (farm yield). The difference between headgate <br />yield and farm yield is the amount of water lost to seepage and other causes related to the conveyance <br />of water through the ditch. (Rice (1991)) <br />Zanjero <br />Spanish term for ditch rider or water commissioner. One who regulates the delivery of water to <br />irrigation users. (Rice (1991)) <br />