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<br />001838 <br /> <br /> <br />in the lower Gila and Colorado River basins in Arizona and parts of <br /> <br />southeastern Nevada. Based on curves developed by the Weather <br /> <br />Bureau, 1957, the summer (May-October) evaporation ranges from <br /> <br />80 percent in the Green River basin, in parts of the mountainous area <br /> <br />of east-central California, and in the northern Utah and Nevadasec- <br /> <br />Hons of the Great basin, to 68 percent in southern Arizona and 62 <br /> <br />percent along the coast in southern California. From this, it is seen <br /> <br />. that summer evaporation is highest in those areas where grazing <br /> <br />generally is limited to the summer season. Stock ponds should be <br /> <br />planned and designed accordingly. In the southern latitudes where <br /> <br />yearlong grazing is practised, the evaporation is more evenly <br /> <br />distributed although a major part again occurs in the summer ,season. <br /> <br />Evaporation losses may be reduced by an appreciable amount <br /> <br />through proper design of the stock pond and possibly to some extent <br /> <br />by application of monomolecular films. An obvious and desirable <br /> <br />. <br /> <br />design criteria for reducing losses is a low ratio of pond surface <br /> <br />area to volume. Unortunately most stock pond sites do not permit <br /> <br />much leeway in this regard but in selecting sites the possibilities <br /> <br />should be recognized and taken advantage of if favorable. Selecting <br /> <br />sites and designing the stock pond with the objective of securing <br /> <br />minimum wind movement across the water surface can also have <br /> <br />an effect on evaporation losses since one of the important factors <br />47 <br />