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In addition to key structures, represented by a single headgate structures with one demand, the <br />modeling effort includes explicit representation of "demand structures" and "diversion systems". <br />Demand structures represent agricultural and/or municipal users that receive water from several <br />sources to meet a single demand. For instance, Riverside Irrigation System meets their irrigation <br />demand from a direct flow right through the Riverside Canal and, if necessary, from water <br />released from Riverside Reservoir. Riverside Reservoir is an "on-ditch" reservoir; therefore <br />releases are not carried through the headgate of Riverside Canal. Larger municipalities, such as <br />Ft Collins, often have several treatment plants that can deliver water throughout the city. The <br />river headgate diversions (or wells) that meet these demands will be modeled as carriers to a <br />single "demand" structure. <br />Diversion systems are defined as a group of diversion structures on the same tributary and <br />operated in a similar fashion to satisfy a common demand. Diversion systems represent the water <br />Diversion systems represent the water rights, acreage, and historical diversions of each <br />component diversion structure explicitly. <br />Results <br />Key Diversion Structures <br />Table 1 identifies the total number of key and diversion system structures, total decreed water <br />rights, and tota12001 acreage by Water District. The general headgate locations of the key <br />diversion structures are shown in the figures at the end of the memorandum. The headgate <br />locations on the figures are based on the GIS coverage available on the CDSS web site. Note that <br />some of these locations may not be on the stream or may overlap headgates from other <br />structures. The figures are intended to provide a general understanding of the spatial distribution <br />of key structures and diversion system structures that make up diversion systems. The Water <br />District identifiers are included on the figures for reference. Names of structures were not <br />included on the figures to ease readability. <br />As shown in Table 1, 359 structures were identified as key and recommended to be modeled <br />explicitly in the South Platte River Basin. These structures include individual structures and the <br />main identifier within diversion systems. 294 separate structures associated with diversion <br />systems were also identified in the South Platte basin. The water rights, acreages, and demands <br />associated with 653 total structures (key structures plus structures within diversion systems) will <br />be modeled explicitly in the SPDSS efforts. This represents 99 percent of the irrigation demand <br />in the basin. <br />Tables 2, included at the end of this memorandum, presents each key diversion structure and <br />primary structure in diversion systems and the associated 2001 acreage for the South Platte <br />basin. These key structures, as noted, include reservoir carriers, transbasin diversions, and <br />municipal/industrial diversions in addition to irrigation diversions. Acreage listed under the <br />primary structure of a diversion system includes acreage for all structures included. Table 3, also <br />included at the end of the memorandum, lists the individual structures in each diversion system <br />in the South Platte basin. The list of key structures is intended to be used in both the SPDSS <br />consumptive use and water resource planning model efforts. Additional information about each <br />