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2-A PACIFIC SOUTHWEST INTl!lR-AGENCY COM4ITTEE ANNuAL FLOOD--The highest stage or the greatest discharge in a water year. ANNUAL FLOOD PEAK SERJES--A list of ail the annual peak flood discharges known, arrenged either in order of magnitude or chronologically. ANmJAL LCM-FLOW--The lowest flow occurring each year, usually the lowest ,average flow for periods of perhaps 3, 7, 15, 30, 60, 120, or 180 consecutive days. Instantaneous ldw flow, unlike instantaneous peak flow, is usually of little interest. Because of the ennual cycle of runoff, the years of computation of low-flow periods are usually offset fran the conventional water year by six months and start on AprU 1 of the stated calendar year. ANTECEDENT PRECIPITATION--Precipitation that occurred prior to the particular event, condition, or time under consideration. Usually, it applies to that prior precipitation which is still effective in modifying infiltration or runoff. APPLlED WATER (IRRIGATION)--water made available for crop use. It does not include direct precipitation nor conveyance losses before reaching the edge of the field. APPLlED WATER RI!);l.UIREMI!lNT--The amount of water required to be delivered to a farmer's head gate for a crop in a given period of time. It does .not include direct precipitation. APPROPRIATED PUBLIC LANDS--Original public danain lands which are covered by entry, patent, certification, or other evidence of land disposal. For certain purposes, public lands which are within a reservation, which contain improvements constructed with the aid of Federal funds, or which are covered by certain classes of leases are also considered appropriated. ' APPROPRIATIVE WATER RIGHT--The legal right, acquired by fulfilling certain legal requirements, to take or divert water for beneficial use. ARABLE LANDS--Lands capable of being cultivated end suitable for the production of crops. The Bureau of RecJ.il.mat1on is required by law to use for arable land, "Land which, in adequate units and when properly provided with . the essential improvements of leveling, drainage, buildings, irrigation , facilities and the like, will have'a productiVe capacity, under sustained irrigation agriculture, sufficient to: meet all production expenses, including a reasonable return on investment; repay reasonable irrigation and improvement costs; and provide a satisfactory level of living for the farm family." ,-