Yampa River Basin Water Resources Planning Model Final Report

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� I (i.e., 09000000). This convention allows the use of existing SGS stream gaging station IDs. g gg g Appendix A contains the yampa.rin file. Phase IIIa enhancements that impacted the river network file included: ' • adding twenty -seven aggregated irrigation demand nodes, three aggregated reservoirs, three aggregated stock ponds, and three aggregated municipal and industrial demand nodes (see Appendix D.3, D.10, and D.11); • adding three nodes representing irrigation diversions in the Little Snake River basin within Wyoming to the Phase IIIa model; they replaced a single node in the Phase II model that represented irrigation consumptive use in the same basin within Wyoming (see Appendix D.14); ' • adding a tributary, Dome Creek, to the Upper Bear River system, including a new instream flow reach and a small transmountain diverter located on the stream (see Appendix D.12( ?)); • replacing 73 instream flow demand points in the Phase II model with 15 instream flow reaches (see Appendix D.1) • adding Green River consumptive use (see Appendix DA) ' • adding a dummy diversion node immediately upstream of the terminus node; this change was required because StateMod does not permit return flows to the terminus node (see Appendix DA). Table 4.1.1a shows how many nodes of each type are in the Yampa Model. TABLE 4.11A River Network Elements Type _ Num ber Diversion 279 Instream Flow 16 Reservoirs 15 USGS Gag es 18 Total 328 4.1.2 River Station File - yampaT.ris The river station file contains the name and location of base streamflow data in the river basin. The entries in this file correspond to the time series contained in the base streamflow file yampaTH.xbm. These input files are listed in Appendix A. As presented in Table 4.1.1a, gaged flows were included at 18 locations throughout the Yampa River basin. In addition, 68 ungaged baseflow points were included for a total of 86 hydrologic inflows to the Yampa Model. Under Phase IIIa, 14 new baseflow nodes were added to the model. Twelve of these were aggregated irrigation structures that were placed immediately above either a gage or a Phase II baseflow node. These nodes (ADY_004, ADY_005, ADY_006, ADY_010, ADY_013, ADY_014, ADY_016, ADY_017, ADY_020, ADY_022, ADY_024, and ADY_025) became baseflow nodes with zero gain between them and the downstream gage or baseflow node. This approach was adopted for two reasons: 1) so that the total upstream depletions would be represented at the gage; and 2) so that the River System 4 -3