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key structure, including water source, total decree, diversion period of record, and average <br />annual diversions are included in each individual Task 3 Water District memorandum. <br />Key Demand Structures <br />A "demand" structure is recommended if: <br />• Demand can be met through more than one river headgate. For instance, North <br />Poudre Irrigation Company can meet their irrigation demand from headgates on both <br />the North Poudre and the mainstem Cache la Poudre Rivers. <br />• An off-channel reservoir delivers water directly to demand. The demand may also be <br />met from direct diversions, as with the Riverside example above, or the demand can <br />be met only from reservoir releases, as is the case with the FRICO-Milton demand. <br />• Demand can be met through a single headgate, but water sources have different <br />delivery losses. For instance, deliveries from an upstream reservoir may experience <br />both river losses and canal losses whereas direct diversions only experience canal <br />losses. <br />• River headgate delivers water to more than one demand, and at least one of those <br />demands is irrigation. For example, Evans #2 Ditch delivers water to both Milton <br />Reservoir (for FRICO-Milton use) and to lands irrigated under Evans #2 Ditch. In this <br />case, irrigation under Evans #2 is modeled as a separate "demand" structure, because <br />the Evans #2 headgate diverts water for two separate demands. <br />In the Task 66 memorandum (Collect and Develop Municipal and Industrial Consumptive Use <br />Estimates) it was recommended to model key municipal demands that are served by several <br />sources using indoor and outdoor demand nodes. For instance, the City of Greeley has a single <br />indoor demand, but has diversion points both on the Cache la Poudre River and the Big <br />Thompson River that meet that demand. <br />Key demand structures are included in Tables 2 and 3. As discussed above, the individual <br />diversions and water rights that will be modeled as carriers to these demands are shown Table 1 <br />and noted as such in the comment section column. Ten (10) municipalities and nine (9) industrial <br />structures will be modeled explicitly as demand structures -the remaining municipal and rural <br />demands will be modeled in aggregates. Twenty-five (25) irrigation systems will be modeled <br />explicitly with demand structures. Note that for modeling efforts, acreage assigned to the river <br />headgate structure is re-assigned to the demand structure. <br />The naming convention adopted for modeling demand structures is as follows: <br />• Municipal demand nodes include water district, abbreviated municipal name, and "P' <br />or "O" representing indoor or outdoor demand. Demand structure names are limited <br />to 12 characters. For instance, Thornton demand structures are 02THORTON I and <br />02THORTON_O. As discussed in the Task 66 memorandum, splitting demand into <br />indoor and outdoor allows outdoor demands to be given a lower use priority in times <br />of limited supply. <br />• Demand structures are given a unique identifier that includes the primary source <br />identifier with a ` I' extension. For example, the North Poudre Irrigation Company <br />demand structure is assigned the unique identifier `0300994_I' to designate that the <br />primary source is North Poudre Canal (0300994). Similarly, the demand structure <br />