Yampa River Basin Water Resources Planning Model Final Report

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4.0 MODELED HISTORICAL DATA DESCRIPTION Three data sets were developed for the Yampa River Water Resources Planning Model (Yampa Model): the historical, the calculated, and the baseline. The historical data set was used to develop baseflows and calibrate the model. It provides results that allow the hydrology to be checked and ditch efficiency and return flows to be evaluated. The calculated data set builds upon the historical data set by allowing selected ditch systems and reservoirs to operate by demand rather than by historical diversions or end -of -month (EOM) contents. The baseline data set builds upon the calculated data by allowing reservoirs, structures, and operating rules that were constructed or have changed during the study period to operate in a consistent manner for the entire study period. This chapter describes the historical data set. Chapter 5 describes changes made for the calculated and baseline data sets. The historical data set is presented in these five subsections: 4.1 River System 4.2 Diversions 4.3 Reservoirs 4.4 Instream Flows 4.5 Operating Criteria File A detailed generic description of the Statemod input files can be found in the State of Colorado's Stream Simulation Model (StateMod) Users' Manual. Appendix A of this document lists all the input files for the Yampa Model. Appendix B describes structures that were modeled in a manner that was not consistent with standard modeling procedure. Appendix C contains structure - specific information along with summary discussions on various aspects of the modeling effort. Appendix D describes the Phase IIIa enhancements. To simplify review and maintenance of this document, small tables are included with the text while large tables or those generated by StateMod are included at the end of the chapter. Table numbering corresponds to the section that introduces the table. For example, Table 4.1.1a is the first table referenced in section 4.1.1. 4.1 River System Five input files specify the Yampa River basin system in the Yampa model: 4.1.1 River Network File 4.1.2 River Station File 4.1.3 Base Streamflow File 4.1.4 Historical Streamflow File 4.1.5 Baseflow File 4.1.1 River Network File - yampaT.rin The river network file describes the location and connectivity of each river location and structure modeled in the basin. The modeled network starts at the headwaters of the Bear River and ends at the Colorado -Utah state line. Figure 4.1.1a illustrates the modeled network. The river nodes use the same numbering convention as the United States Geological Survey (USGS) stream gaging stations, River System 4 -1