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4.0 MODELED HISTORIC DATA DESCRIPTION <br />Three data sets were developed for the White Model: the historic, the calculated, and the baseline. <br />The historic data set was used to develop baseflows and calibrate the model It provides results that <br />allow the hydrology to be checked and ditch efficiency and return flows to be evaluated. The <br />calculated data set builds upon the historic data set by allowing selected ditch systems and reservoirs <br />to operate by demand rather than by historic diversions or end-of--month (EOM) contents. The <br />baseline data set builds upon the calculated data by allowing reservoirs, structures, and operating <br />rules that were constructed or have changed during the study period to operate in a consistent manner <br />for the entire study period. This chapter describes the historic data set. Chapter 5 describes any <br />changes made for the calculated and baseline data sets. <br />As described in section 3.2, White River Basin model data was developed in two steps (Phase II and <br />Phase IIIa). A detailed description of the modeling input files can be found in the StateMod Users' <br />Manual. Appendix A (http://cdssstate.co.us) contains all of the input files. Appendix B contains <br />discussions concerning those structures that were modeled in a manner that was not consistent with <br />standard modeling procedure. Appendix C contains information that is specific to a structure along <br />with summary discussions on various aspects of the modeling effort. Appendix D contains data <br />associated with the Phase IIIa enhancements. <br />To simplify the review and maintenance of this document, small tables are included with the text <br />while large tables or those generated by StateMod are included at the end of the chapter. Table <br />numbering corresponds to the section that introduces the table. For example, Table 4.1.1 a was the <br />first table referenced in section 4.1.1. <br />4.1 River System <br />The White river basin system is described in the Colorado River Decision Support System (CRDSS) <br />White Model by five files: <br />4.1.1 River Network File <br />4.1.2 River Station File <br />4.1.3 Base Streamflow File <br />4.1.4 Historic Streamflow File <br />4.1.5 Baseflow File <br />4.1.1 River Network File - whiteT.rin <br />The river network file describes the location and connectivity of each river location and structure <br />modeled in the basin. For the White River, the network starts at the headwaters of the North and <br />South Fork of the White River and ends at gage number 09306395, White River near the Colorado- <br />Utah state line. Figure 4.1.1 a illustrates the modeled network in terms of the physical river system. <br />Appendix A (http://cdssstate.co.us) contains the whiteT.rin file. <br />River System 4-1 <br />