RGDSS_Task6-7_HistoricMonthlyModel_DiversionFiles

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Water District IDs Six-digit structure IDs are included in the direct diversion station file, which is a combination of water district number and structure ID obtained from the Division of Water Resources' (DWR) structure and water rights tabulations. Water District "90" was used to represent structures that divert water within the Rio Grande Basin but are located in the State of New Mexico (e.g. Costilla Creek). Ditch Capacities and Efficiencies The watright command file references the Rio Grande network file (rg.rin) and extracts diversion station data associated with all river diversion stations in this file. In its initial application, watright creates the diversion station file (rg.dds), and diversion rights file (rg.ddr) which is further discussed below. Application of the DMI demandts, in addition to creating the historic diversion file (rg.ddh) modifies the diversion station file to include capacity estimates which reflect actual diversion records and average monthly efficiency data which reflect actual diversion records and consumptive irrigation requirement estimates. The following general commands were used to set up specific characteristics of all diversion stations using the DMI demandts. Note that the irrigation efficiency values provided are expected to be refined in subsequent phases when consumptive irrigation estimates are available for every agricultural ditch. • ditch capacities: the capacities of all ditches were set to their historical maximum diversion amounts (usehistcap). • irrigation efficiencies: monthly efficiencies were set based on information developed by the RGDSS Consumptive Use contractor (Table 1) (eff12, seteff}. Subsequent modeling efforts will use efficiencies determined for each month of the year based on the ratio of the average crop water requirement for the month to the average historical monthly diversion. Table 1 Irrigat ion Efficiencies for Phase 1a Model Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep District 20 52% 0% 0% 0% 0% 0% 40% 40% 52% 52% 52% 52% District 21 49% 0% 0% 0% 0% 0% 38% 38% 49% 49% 49% 49% District 22 39% 0% 0% 0% 0% 0% 31% 31% 39% 39% 39% 39% District 24 39% 0% 0% 0% 0% 0% 31% 31% 39% 39% 39% 39% District 25 39% 0% 0% 0% 0% 0% 31% 31% 39% 39% 39% 39% District 26 39% 0% 0% 0% 0% 0% 31% 31% 39% 39% 39% 39% District 27 49% 0% 0% 0% 0% 0% 38% 38% 49% 49% 49% 49% District 35 44% 0% 0% 0% 0% 0% 34% 34% 44% 44% 44% 44% Closed Basin Delivery Points Four diversion stations in Water District 20 that are explicitly represented in the Rio Grande Surface Water Model supply water to the Alamosa National Wildlife Refuge and the Blanca Wildlife Habitat Area. Included are the Chicago Ditch (ID 200575), the New Ditch (ID 200773), and Closed Basin Canal deliveries (20ANWR and 20BLANCA). Efficiencies of these diversion stations were set to 30 percent year-round to reflect less efficient water use practices associated C:Acdss\Task6-7.doc Prepare Diversion Files November 04, 1999 -Page 2 of 6