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<br />~ <br />~ <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />b. Model Structure <br /> <br />The network shown on Figure IV-6 was used to model the Rio Grande <br />River basin through the San Luis Valley. The three reservoirs: Santa <br />Maria; Continental; and Rio Grande; are shown as triangles. Santa <br />Maria Reservoir has a storage capacity of 43,564 acre-feet (at the <br />spillway crest), Continental Reservoir has a storage capacity of <br />22,679 acre-feet (at the spillway crest), and Rio Grande reservoir was <br />given a capacity of 52,192 acre-feet. Santa Maria and Continental <br />reservoirs are isolated in the network such that water in storage can <br />only be called out by shareholders of the SMRC. <br /> <br />The network diagram al so contains nodes, shown as circles, which <br />are points of intersection of flow. The node names were selected so <br />as to have some geographical significance. The network also has unre- <br />gulated inflows which are shown as elipses. For example, PORC repre- <br />sents the monthly flows (1956-1986), in acre-feet, of North Clear <br />Creek which can be regulated by Continental Reservoir, (the name <br />"PORC" was derived from nearby Porcupi ne Gul ch). <br /> <br />Two unregul ated inflows are uni que; FREEl and FREE2. They repre- <br />sent inflows during May and June into Continental and Santa Maria <br />reservoirs respectively. Recent water rights adjudication pennits an <br />exchange of di rect flow rights of the Ri 0 Grande Canal to storage in <br />the reservoir. This exchange is pennitted if Rio Grande River fl ow <br />at the Del Norte gage exceeds 2,285 cfs and flow in the Rio Grande <br /> <br />IV - 15 <br />