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<br />1)31850 <br /> <br />>STOCK :rON:DtlYPROLOGY <br /> <br />Methods of estimating_water supply <br /> <br />Predicting the adequacy, and reliability of supply fOr stock <br /> <br />ponds is even more comple1< than for major reservoirs, yet the <br /> <br />smallness of a single project discourages extensive fact gathering <br /> <br />and analysis. Estimating the supply i$ cOmplica,ted Qy the fact <br /> <br />that very often the pond is filled from flashy_ surfa,ce runoff a,nd <br /> <br />. from wet weather springs rather than from steady-groun'd'..water <br /> <br />sources (.A,SCE, 1949); the wa.~ershed area ia small S9 its pecu- <br /> <br />lia;ritles make extrapolation from o~her areas ine:l(act, and pre- <br /> <br />Cipitation and runoff in{orma,tion is rarely available for the <br /> <br />supplying _area. In the face of these dJfficulties, tp.e engineer <br /> <br />must still make estirrlates of the supply of water before proceed- <br /> <br />ingwith his design of the stock pond. <br /> <br />. <br /> <br />What in{ormation is needed about the wate~ supply? Basi- <br /> <br />cally in{ormation is needed on thl" amount, time, distriQution, <br /> <br />probable rates, and quality of the runoff from a contributing .area. <br /> <br />The average amount of rUlloff, itllelf, is of little value-~livestock <br /> <br />can't drink averages. An an~lysis of the hydrographandanunder- <br />- . <br /> <br />standing of. the short-term qistribution of runoff, preferably on a <br />! <br /> <br />stor.m basis, with allowanctjfor snowmelt, are needed,and the <br /> <br />annual vari",tion ih the prob~ble supply must be known by the <br /> <br />2."~ <br /> <br />~"""'- <br /> <br />