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Because the pond intercepts spring water, inflow to the pond cannot be <br />measured directly. Inflow to the pond can be calculated, however, using a <br />water balance equation. <br />In this case, inflow to the pond is equal to the outflow plus the change in <br />the volume stored in the pond: <br />Inflow = Outflow + AVolume (eq 2) <br />Outflow from the pond will be equal to the sum of the releases, irrigation <br />consumption, industrial consumption and evaporation losses: <br />Outflow = Releases + Irrigation + Industrial + Evaporation (eq 3) <br />Substituting (eq 3) into (eq 2) results in inflow being equal to the sum of <br />the outlet releases, irrigation consumption, industrial consumption, <br />evaporation losses, and the change in volume: <br />Inflow = (Releases + Irrigation + Industrial + Evaporation) + OVolume (eq 4) <br />Substituting (eq 4) into (eq 1) results in storage being equal to the sum of <br />the irrigation consumption, industrial consumption, evaporation losses, <br />and the change in volume: <br />Storage = Irrigation + Industrial + Evaporation + OVolume (eq 5) <br />All components of storage will be measured or estimated on a monthly <br />time step. Irrigation withdrawals to the southern lawn will be measured <br />through the use of totalizing flow meters; irrigation withdrawals to the <br />northern lawn will be estimated by multiplying the volume of water pumped <br />to the southern lawn by a ratio of (0.08 / 0.34). Irrigation consumption will <br />be calculated by multiplying the total irrigation withdrawals by 50% in order <br />to account for water applied to irrigation that is not consumed. Industrial <br />withdrawals to the gravel pit will be measured through the use of totalizing <br />flow meters; industrial consumption will be equal to the industrial <br />withdrawals. Evaporation losses will be estimated by multiplying the gross <br />evaporation amounts found in Table No. 3 by the current pond surface <br />area. The change in volume will be determined through the use of a rating <br />table and staff gauge calibrated for the pond. Exhibit A contains an area- <br />capacity table developed for the pond which will be used to determine <br />pond surface area and volume. <br />Out-of-priority storage in the pond will be calculated by multiplying the <br />percent of time a call is on in any given month by the storage that <br />occurred that month. Should the storage term be negative, no <br />8