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<br /> <br />002053 <br /> <br />. <br /> <br />Letting ZI denote the zone number whose upper limit is <br />denoted by control volume VZI and lower limit by VZI_I' the <br />ratio for the zones intermealate between the lowest and <br />highest is given by: <br /> <br />RATIO <br /> <br />(V-VZI_I) <br />= <br />(VZI-VZI_I) <br /> <br />For the lowest zone (Zone 1) the corresponding equation is: <br /> <br />RATIO <br /> <br />(V-VDS) <br />= <br />(VZI-VDS) <br /> <br />For the highest zone (Zone ZIM+I), the ratio corresponds to <br />the quantity of water above VZIM since there is no upper limit: <br /> <br />RATIO = (V-VZIM)(I+BANK) <br /> <br />. <br /> <br />When water is in this zone for several reservoirs and exceeds <br />the demand, individual releases are based on taking the same <br />percentage of water in this zone from each reservoir. For all <br />lower zones, the procedure used for balanced operations is <br />applied successively to ea~h zone. <br /> <br />Since the control zone volumes may be specified in various ways <br />for each reservoir, a great deal of flexibility in reservoir <br />operations exists. For example, in Figure (4b) , the two <br />reservoirs would operate in similar ways. However, in Figure (4c), <br />Reservoir A would exhibit small fluctuations in content relative <br />to Reservoir B when contents are high but would experience <br />large variations when contents are low. <br /> <br />. <br /> <br />It should be noted that the release rule code is specified for a <br />reservoir and is not associated with the segment data. Conse- <br />quently, if one segment references A and B while another <br />references A, B, and C, it is impossible to use balanced opera- <br />tions for A and B operating together and control zone volumes <br />for A, B, and C. Thus, all reservoirs operating conjunctively <br />must have the same release rule code. When a logical analysis <br />of inputs is requested, this condition is checked after any <br />zero or blank release codes are set to 2. Otherwise, the program <br />uses the release rule code of the first available reservoir it <br />encounters. <br /> <br />2-11 <br /> <br />(rev. 07/75) <br /> <br />