Yampa River Basin Water Resources Planning Model Final Report

• Description: Yampa River Basin
• State: CO
• State: UT
• State: WY
• Basin: Yampa/White/Green
• Water Division: 6
• Date: 2/1/1997
• Author: Boyle Engineering Coporation, Riverside Technology, Inc.
• Title: Yampa River Basin Water Resources Planning Model Final Report
• Water Supply Pro - Doc Type: Report/Study

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4.4.1 Instream Station File - yampaT.isf
Table 4.4.1a shows the instream flow reaches included in the Yampa Model along with their location
and average annual demand based on decree amount. Section 4.4.2 describes how instream demands
were estimated.
Phase IIIa enhancements that impact the instream station file include replacing 73 instream flow
points with 15 instream flow reaches. This enhancement, which involved revising the StateMod
program, was implemented to satisfy instream flow decree requirements. Secondly, an instream
flow reach was added to the Yampa model on Dome Creek, a Bear River tributary that was newly
included under Phase IIIa. Appendixes D.1 and D.12 describe these Phase IIIa enhancements.
4.4.2 Instream Demand File- yampaT.ifa
Instream flow demands were developed from decreed amounts and comments in the state engineer's
water rights tabulation. Twelve monthly instream flow demands were used for each year of the
simulation. The file yampaT.ifa contains monthly demands for each instream flow structure included
in the Yampa Model.
Phase IIIa enhancements that impacted the instream demand file are the same as those described in
Section 4.4.1. Appendixes D.1 and D.12 describe these Phase HIa enhancements.
4.4.3 Instream Right File - yampaT.ifr
Water rights for each instream flow reach modeled in the Yampa River basin are contained in the
yampaT.ifr file. Table 4.4.3a summarizes the administration number and decreed amount for each
instream flow reach modeled. These data were obtained from the CRDSS database and correspond to
the State Engineer's official water rights tabulation.
Instream Flows 4 -16
4.4 Instream Flows
'
Instream flows are described in the Yampa Model by three files:
4.4.1 Instream Station File
4.4.2 Instream Demand File
4.4.3 Instream Right File
4.4.1 Instream Station File - yampaT.isf
Table 4.4.1a shows the instream flow reaches included in the Yampa Model along with their location
and average annual demand based on decree amount. Section 4.4.2 describes how instream demands
were estimated.
Phase IIIa enhancements that impact the instream station file include replacing 73 instream flow
points with 15 instream flow reaches. This enhancement, which involved revising the StateMod
program, was implemented to satisfy instream flow decree requirements. Secondly, an instream
flow reach was added to the Yampa model on Dome Creek, a Bear River tributary that was newly
included under Phase IIIa. Appendixes D.1 and D.12 describe these Phase IIIa enhancements.
4.4.2 Instream Demand File- yampaT.ifa
Instream flow demands were developed from decreed amounts and comments in the state engineer's
water rights tabulation. Twelve monthly instream flow demands were used for each year of the
simulation. The file yampaT.ifa contains monthly demands for each instream flow structure included
in the Yampa Model.
Phase IIIa enhancements that impacted the instream demand file are the same as those described in
Section 4.4.1. Appendixes D.1 and D.12 describe these Phase HIa enhancements.
4.4.3 Instream Right File - yampaT.ifr
Water rights for each instream flow reach modeled in the Yampa River basin are contained in the
yampaT.ifr file. Table 4.4.3a summarizes the administration number and decreed amount for each
instream flow reach modeled. These data were obtained from the CRDSS database and correspond to
the State Engineer's official water rights tabulation.
Instream Flows 4 -16