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<br />Computing the monthly pond conditions was based on mass balance of the <br />volume stored. The average volume for the month was computed by: <br /> <br />VAVG;(VSEGIN+VEND)/2, <br /> <br />(6) <br /> <br />where VAVG is the average storage, in cubic feet; <br /> VSEGIN is the storage at the beginning of the month, in cubic feet; and <br /> VEND is the storage at the end of the month, in cubic fee t. <br /> <br />(owever, VEND;VSEGIN+QIN-E-S, (7), <br /> <br /> <br /> <br />IWhere QIN is the inflow, in cubic feet per month; <br /> <br /> <br />lEis the evaporation, in cubic feet per month; and <br /> <br /> <br />S is the seepage, in cubic feet per month. <br /> <br /> <br />iBecause evaporation is a function of surface area and seepage is a function <br />iof depth, these values are actually functions of the average monthly volume. <br />IThus, there is an iterative process of estimating the average volume; comput- <br />:iog evaporation and seepage from that average volume; solving equation 7 for <br />iVEND; and then comparing the average volume computed with equation 6 with the <br />!initial estimate. The initial estimate can be systematically adjusted and <br />;the above step repeated several times until the computed and estimated <br />average volumes compare within an acceptable level of error. <br /> <br />Computations of pond surface area, depth, and shoreline perimeter were <br />:of interest to wi ldlife-habitat specialists. Because no specific pond sites <br />;have been chosen, a typical shape and slope of the potential ponds was deter- <br />:mined by evaluating depressions in the sand hills using topographic maps. <br />,This analysis led to the following formulations: <br />i <br />I <br />, <br />'and <br />j <br />i <br /> <br />2" <br />d =50, <br /> <br />d;0.4d, <br /> <br />(8) <br />(9) <br /> <br />:where 2" <br />d <br />d <br /> <br />is the radius of an assumed pond, in feet; <br />is the maximum depth, in feet; and <br /> <br />is the average depth, in feet. <br /> <br />; <br />i <br />i <br />iUs ing <br />I <br />, <br />! <br /> <br />the assumed circular surface area, then <br /> <br />i and <br />I <br />Iwhere <br /> <br />A;nr2;(50d)2n=15,625d2, <br />V=dA, <br /> <br />(10) <br /> <br />(11) <br /> <br />" <br /> <br />V is the volume in storage, in cubic feet; and <br />A._is_the_ surface_ar,ea ,_J n ..square. feet. <br /> <br />L6 <br /> <br />.....~ <br />