WSP12371

• File Number: 8240.300.11
• Description: San Juan River Recovery Program - Coordination Committee
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 9/25/1996
• Title: modeled historic Data Description
• Water Supply Pro - Doc Type: Report/Study

22S8

.

.

4.0 MODELED HISTORIC DATA DESCRIPTION

Three data sets were developed for the San Juan Model: the historic, the calculated, and the baseline,
The historic 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 historic data set by allowing selected ditch systems and reservoirs
to operate by demand rather than by historic 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 data set provides results that can be used directly for a "what if'
analysis. This chapter describes the historic data set. Chapter 5 describes revisions made to this data
to represent the calculated and baseline data sets.

The historic data set is divided into the five subsections listed below. A detailed description of the
modeling input files can be found in the StateMod Users' Manual. Appendix A contains all of the
input files. Appendix B contains discussions concerning those structures that were modeled in a
manner that was not consistent with standard modeling procedure, Appendix C contains information
that is specific to a structure along with summary memoranda on various aspects of the modeling
effort,

4.1 River System

The San Juan and Dolores river basin system is described in the San Juan Model by the five files
described in the following subsections:

4.1.1 River Network File
4.1.2 River Station File
4.1.3 Base Streamflow File
4.1.4 Historic Streamflow File
4.1.5 Baseflow File

4.1.1 River Network File - sa'liuan.rin

The river network file describes the location and connectivity of each river location and structure
modeled in the basin. For the San Juan River, the network starts at the headwaters of the East Fork of
the San Juan River and ends at gage number 09379500, San Juan River near Bluff, Utah. The
Dolores River network begins at its headwaters near Bolam Pass in the San Juan National Forest.
The San Miguel joins the Dolores just downstream of gage number 09171100, Dolores River near
Bedrock, Colorado, The downstream gage for the Dolores River is number 09179500, Dolores River
at Gateway, Colorado, Figure 4.1.1a illustrates the modeled network. This network includes the
physical river system, and for special cases, project canals and aggregate demand nodes.
Appendix A contains the sanjuan.rin file,

~~:..:;..;.

Modeled Historic Data Description
a12rvw,pdflf:.v~'arUllQn/4_().J.dlJc 9125196

4-1