Laserfiche WebLink
<br />000545 <br /> <br />After the calcalations for the cnrrent period are com- <br /> <br />pleted, the flows in the carryover storage links (i.e" the total ending <br /> <br />storage) are adjnsted as follows. <br /> <br />1. <br /> <br />"An initilLl guess EVP. of evaporation loss is first lIIade. <br />1 <br /> <br />The <br /> <br />total carryover storage, inclnding evaporation loss is: <br /> <br />qitotal = (qiS(desired) + qiSCfinal)) <br /> <br />2. The current estimate of actual ending storage is <br /> <br />Cq't t 1 - EVP.) <br />loa 1 <br /> <br />3. Now compute the average surface area A over the period: <br /> <br />A. = O.S [A.(S.) + A.Cq't t l-EVP.)] <br />1 11 1 loa 1 <br /> <br />and update the evaporation estimate EVP as <br /> <br />EVPi = ei <br /> <br />A. <br />1 <br /> <br />4. Return to Step 2 and repeat until successive evaporation <br /> <br />estimates converge within aOllle predefined error tolerance. <br /> <br />Hvdroloaic States <br /> <br />The target storage levels T. for each reservoir i can either be <br />1 <br /> <br />specified (and allowed to vary) for each period of the simulation, or <br /> <br />the target storage can be conditioned on the "hydrologic state." The <br /> <br />hydrologic state is defined as <br /> <br />R = ~ <br />hH <br /> <br />The set H represents the set of reservoirs for which it is desired to <br /> <br />[5. + I.] <br />1 1 <br /> <br />(9) <br /> <br />compnte a hydrologic <br /> <br />state, where S. <br />1 <br /> <br />is initial storage and I. is <br />1 <br /> <br />inflow. Since the hydrologic "state" is based On initial storage, <br /> <br />then it is fixed at the beginning of the time period and remains at that <br /> <br />state throughout that period. even though storage may change dramati- <br /> <br />cally during the period. <br /> <br />The user now defines parameters %1 and %2 (it may be necessary to <br /> <br />16b <br />