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<br />37. The physLcal and socLoeconomLc characterLstLcs are entered for a <br />proposed reservoLr and the program cllooses from the two most sLrnLlar reser- <br />voirs, one physical and- one soci.oeconomic~ Then the JJper capita use rate <br />versus distance" curves of the two siIni.lar reservoixs are averaged, giving <br />one "per capLta use rate versus dLstance to populated center" curve for the <br />proposed reservoir. The dLstance to the populated center of the county from <br />the proposed reservoLr is substituted into this equation to give a per capita <br />use rate. This per capita use rate is then multiplied by the county popula- <br />tion to give an initial annual visitation for that county. This is done for <br />all counties and summed to get the expected annual visitation for the pro- <br />posed reservoir. The expected camping use is added to this figure to give <br />'the total ini tial annual visi tation for the proposed reservoir. <br /> <br />38. The flood storage subroutine,>Block 9, requires as input the <br />effective drainage area, full pool storage, current pool, minimum pool <br />storage, and average monthly runoff. The program computes the runoff for <br />a given month (J) using the average monthly runoff. It then cycles to see <br />if the reservoir can store this runoff and allow enough space to compensate <br />for a flood (3 in. or 5 in. of runoff from the area above the dam). If <br />these conditions are met, then the flow program is run for month J. If the <br />reservoir cannot store the runoff, then the flow program is run for the <br />previous month (J-l), discharging water at a faster rate so that the reser- <br />voir will have enough space to hold the runoff for month J. This procedure <br />continues until either there is not enough water available to satisfy the <br />flow requirement in the flow program, or the reservoir cannot be drawn down <br />to a level that will allow acceptance of the monthly runoff. The output <br />states whether the reservoir satisfies or does not satisfy flood storage <br />req ui rements . <br /> <br />39. The flow augmentations subroutine, Block 10, requires as input <br />the minimum discharge requirement at Lock and Dam No.2, water available <br />for flow, and excess discharge rate (may be zero). The model determines if <br />there is sufficient water available to meet the flow requirement at Lock <br />and Darn No. 2 for a 3D-day period. If the reservoir (or any reservoir in <br />the system of reservoirs) fails, the requirement is not met and the program <br />ends. If the requirement is met for a given month (J), the routine repeats <br />the computation for the next month (J+l). This procedure is continued until <br />the reservoir fails or the time period in question is completed. The program <br />outputs a statement of whether the flow requirement is or is not met for the <br />month or year in question. <br /> <br />40. The darn construction subroutLne, Block 11, computes the cost of <br />dam and appurtenances as a function of maxLmum dLscharge rate of the dam. <br />The model is based on a dLrect relationship between discharge rate and cost <br />of dam and appurtenances. This relationship was derived from the Rowlesburg <br />General Design Manual (GDM) and from data from existing reservoirs in the <br />Rowlesburg area. <br /> <br />23 <br />