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<br /> <br />.2...1 <br /> <br />PACIFIC 60U'l'HWl!:6T INTER-AGENcY COMMrrrEE <br /> <br />INTERFERENCE (OF WELUl)--A decline in the water level of one well caused <br />by pumping in another well. <br /> <br />INTERFLOW--Runoff that moves through upper soil layers and returns to the <br />sl.U'face or appears in streams without entering a sizable ground water <br />body. <br /> <br />INTERMEDIATE RmIONAL FLOOD--A flood having an average frequency of <br />exceedence in the order of about once in 100 years. <br /> <br />IRRIGABLE LANDS--Arable lands capable of being irrigated by any method, <br />and for which irrigation will enhance crop production. The Bl.U'eau <br />of RecJ.amation is required, by law, to use for irrigable land, <br />"arable land for which a water supply is available and which is <br />provided with or planned to be provided with irrigation, draillage, <br />flood protection, and other facilities as necessary for sustained <br />irrigation utilization." . ' <br />IRRIGATION DEPLETIOO--See IlIIIPJ:.lr.CION (WATJIlR). <br /> <br />IRRIGATIOOEFFICIENCY--The ratio of consUlllptive use 01' applied irrigation <br />water to the total amount. <br /> <br />IRRIGATION REQUIREMENT--The quantity of water, exclusive of percipitation, <br />that is required for production 01' food, tiber, or forage. <br /> <br />IRRIGATION RETURN FLOW--Water which is not consumptively used and returns <br />to a surface supply. Under conditions 01' water-right litigation, the <br />detinition may be restricted to measurable water returning to the <br />stream trom which it was diverted. See also !lIIlTl1.RN J'LCM. <br />