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4.2 Diversions <br />Five files describe diversions in the White Model: <br />4.2.1 Direct Diversion Station File <br />4.2.2 Return Flow Delay File <br />4.2.3 Historic Diversion File <br />4.2.4 Direct Diversion Demand File <br />4.2.5 Direct Diversion Ri h <br />4.2.1 Direct Diversion Station File - whiteT.dds <br />The whiteT.dds file describes the physical properties of each diversion simulated in the White <br />Model. As described in Table 4.1.1 a, 111 key diversions (see Section 1.2) were modeled. Table <br />4.2.1 a presents the structures that were modeled, their capacity, area served, average annual system <br />efficiency, and average annual demand. Structures with zero or -999 acres, zero efficiency, or 100 <br />percent efficiency represent municipal, industrial, and/or transbasin diversions. <br />The Six-digit structure IDs used by the model and presented on Table 4.1.1 a are a combination of <br />water district number and structure ID obtained from DWR's structure and water rights tabulations. <br />Aggregated irrigation structures were identified sequentially as 43_ADW001 for Aggregated <br />Diversion White River basin. Similarly, Aggregated municipal and industrial structures were named <br />43_AMW001 for Aggregated Municipal White River basin. <br />System efficiencies describe the percentage of water diverted at a structure headgate that is <br />consumed. The portion of a diversion that is not consumed returns to the stream system and is <br />available for subsequent diversion. Efficiencies were estimated for different structures types as <br />follows: <br />• For explicitly modeled irrigation structures, a constant efficiency was determined for each <br />month of the year based on the ratio of average historic monthly diversions and the estimated <br />farm irrigation requirement. <br />• For aggregated irrigation diversions, monthly efficiencies were assigned to be the average <br />acreage weighted efficiency of explicitly modeled structures. <br />• For explicitly modeled M&I diversions a constant efficiency was determined based on use <br />and engineering judgment. <br />• For aggregated M&I diversions an efficiency of 100% assigned because it was modeled as a <br />depletion. <br />Return flow locations specify where return flows will re-enter the stream system. Table 4.2.1b <br />presents the return flow locations and patterns for each structure in the White Model. As presented, <br />all modeled structures use the irrigation delay pattern (1) described in Section 4.2.2 except for four <br />structures, which employ the municipal and industrial return pattern (4). These structures are the <br />Coal Creek Feeder Ditch, the towns of Rangely and Meeker, the California company water plant, and <br />the Aggregated Municipal and Industrial Diversion. <br />Phase IIIa enhancements which impact the direct diversion file include addition of six (6) explicitly <br />modeled structures, 16 aggregated diversions, and 1 aggregated municipal and industrial diversion. <br />Appendix D, Section D.3 lists the individual structures associated with each aggregated diversion. <br />Diversion <br />4-6 <br />