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<br /> <br />0020o't8 <br /> <br />. <br /> <br />volume is routed downstream. In this case the <br />minimum capacity is assumed sufficient to accomo- <br />date the entire volume. There is no maximum limit. <br /> <br />It should be noted that specification of a single number for the <br />minimum and maximum capacities in a zone ignores head effects. <br />This is only a first approximation to the true situation. Con- <br />sequently, the value used should be realistic in terms of the <br />needs of the study. <br /> <br />All capacities are specified with the units 1,000 acre-feet/day. <br />The required minimum or allowable maximum release for a month <br />is then based on the daily capacity and the number of days in <br />the month. Leap years are ignored and a perpetual calendar <br />assumed. <br /> <br />Reservoir Inputs - Evaporation Data (Card Types 8-1, 8-2, 8-3) <br /> <br />. <br /> <br />Evaporation rates are time. dependent requiring a specific <br />value for each month. A monthly distribution may be used <br />(Type 8-1) in conjunction with an annual rate (Card 8-2) to <br />yield the monthly values or they may be read directly <br />(Type 8-3). Rates are in acre-feet/acre/time frame (month <br />or annual). Values may be gross or net (difference between <br />evaporation and precipitation). <br /> <br />Reservoir Inputs - Single Reservoir Operation - Demand <br />Array (Card Type 10-4) <br /> <br />Details of the reservoir operating procedures are contained <br />in Section 3. Briefly, the program works from the upstream <br />to downstream boundaries. When a reservoir is encountered, <br />the demand array, IDMD(I), is used to determine how the reser- <br />voir is to be operated. The options are: <br /> <br />IDMD(I)=O - A specified release will not be made, but <br />releases are allowed to satisfy downstream <br />demands or boundary target flows as required. <br /> <br />. <br /> <br />IDMD(I)=l - A specified release is to be made. Specified <br />releases are time dependent. The amount may <br />be given as an annual volume (Card 10-2) which <br />is distributed using the monthly distribution <br />of Card 9-1 or as monthly values (Card 10-3). <br />Further releases to meet demands are not <br />allowed, although uncontrolled spills or over- <br />topping the dam may result in additional <br />releases of water. <br /> <br />2-6 <br /> <br />