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<br /> <br />" , <br />.. Otl2)44 <br /> <br />. <br /> <br />Provisions are also included to identify each node by a descriptive <br />24-character label supplied on the 1-3 Card. Certain element <br />types are similarly identified as indicated below: <br /> <br />Element type <br /> <br />Upstream boundary <br />Downstream boundary <br />River reach <br />Junction <br />Reservoir <br /> <br />Descriptive label on card type <br /> <br />11-1 <br />None <br />None <br />5-1 <br />7-1 <br /> <br />Element data on the 3-1 Card completely define the system con- <br />figuration. It includes the element number and type plus the <br />number of the element immediately downstream. The only exception <br />is for the downstream boundary element which has no element below <br />it. Additional information contained on the junction data card <br />(Type 5-1) includes the number of upstream branches entering the <br />junction as well as the element numbers. This information provides <br />a cross-check on the element data. <br /> <br />. <br /> <br />Figure 2 illustrates the node locating and numbering procedures <br />as well as the numbering and typing of elements for a hypothetical <br />river basin. <br /> <br />Only river reach and reservoir elements can have inputs to account <br />for additions or withdrawals of water and/or salt (see Section 2.3). <br /> <br />Node numbers are used for internal subscripting purposes. Element <br />numbers are considered as external and are employed by the user <br />for all inputs referencing a given element. However, the progTam <br />internally assigns subscripts for each element type, starting with <br />1 for the first element referenced by any input card. They are <br />cross-referenced to the external element numbers. Consequently, <br />rearranging the input deck can result in different internal sub- <br />scripts, although results should be the same. The internal <br />subscripts appear on the listings when initial inputs are requested <br />to be printed (lPRNT(l) on Card 2-3). These are useful for <br />debugging purposes. <br /> <br />2.2 <br /> <br />Reservoir Inputs <br /> <br />. <br /> <br />Reservoir inputs include basic parameters such as area-capacity <br />curves, outlet works capacities, and bank storage coefficients; <br />evaporation rates; initial conditions; and criteria for single <br />and multiple reservoir operations. Rather than using elevations <br />for items such as the top of the inactive storage pool or the <br />spillway crest, the program requires the corresponding reservoir <br /> <br />2-2 <br /> <br />