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<br />. <br /> <br />that the waste fro,m most small springs, estimated in this manner, <br /> <br />often exceeds by several times the flow left for beneficial use, <br /> <br />The small yield requirements ofa properly developed range <br /> <br />stock water facility make it,possibletoconsidersources, such as <br /> <br />minor springs, that wouldbevalueles5 for other purposes. It <br /> <br />is a generally accepted rule in most arid -a,nddsemiarid areas <br /> <br />that no more than 100beado.f-.o-attle, or equivalent in other types <br /> <br />of stock,can beg,r-azed for ,any protr,actedperiod within the <br /> <br />serviceare,a of a single water ,facility without exceeding the carry- <br /> <br />ing capacity and causing d-amage to th-erange. Onpoor'er ranges <br /> <br />the number may be considerably less and on better ranges it <br /> <br />may be exceeded for short periods, but--even on the best range <br /> <br />the limitation of 100 seems to be generally accepted. The actual <br /> <br />drinking requirement for lOO head ofeattle is approximately <br /> <br />1,00-0, gpd {gallons p~r day) 'equivalent toa continuous yield of <br /> <br />O.7gpm(gaUons perl minut-e).'The requirements for larger <br /> <br />herds will be -in',d-i.r,ect pr(l,portionto the num,ber, but a's can be <br /> <br />E;een,a h-erdGt:300,needsa yield justsl-ightly in exces-s of 2 gpm. <br /> <br />R-elathig.a yi-eldoftMs- magnitude to--transpiration losses <br /> <br />.from- phreat-ophytes,.ort-oevaporation from,damp or 'swampy <br /> <br />gr,ound shows that only a relatively small-ar-e-a ,subj-ect to this loss <br /> <br />il; needed to furnish,the requirements for stock use. Evaporation <br /> <br />9 <br /> <br /> <br />U0l83G <br /> <br />. <br />