GRU – WAT. Green River Basin Daily Model. Green River Basin Daily Model (GRM). Overview . Update. Current Daily Results. Enhancements. Future Development. overview. Green River Model. Purpose. The GRM is being developed to project water availability in the Upper Green River Basin based on current.... ID: 478695
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August 27, 2012
GRU – WAT
Green River Basin Daily Model
Slide2Green River Basin Daily Model (GRM)
Overview
Update
Current Daily Results
Enhancements
Future Development
Slide3overview
Green River Model
Slide4Purpose
The GRM is being developed to project water availability in the Upper Green River Basin based on current operating criteria contained in the Flaming Gorge Record of Decision (ROD), and assess future impacts of water development in the Upper Colorado Region on the Green River. Upper Colorado River Endangered Fish Recovery Program published Green River flow and temperature recommendations that require operational decision-making processes and analysis on a daily time step.
Slide5RiverWare Colorado River Simulation System (CRSS)
Monthly time step 2007 UCRC Demand ScheduleSpatial and temporal distributionDirect Natural Flow – Index Sequential Method (ISM)Flaming Gorge Record of Decision Flow recommendation compliance based on calculated values at specific daily thresholdsNeither Flaming Gorge nor Jensen has a daily hydrograph in CRSS
Slide6Update and results
Green River Model
Slide7CRSS Rule Updates
Direct Natural Flow – Index Sequential Method (ISM)
Daily disaggregation calculations are done at the end of each model run (post processing)
Demands are the 2007 UCRC depletions
Daily disaggregation of Yampa River spring flows
April-July period
Flaming Gorge daily spring hydrograph
Record of Decision rule set
Static start date on May 23
April-July daily flows and monthly outflow are different due to post-processing being over April-July period
Daily Base Flows (Aug-Mar) are averaged monthly data
Slide8GRM Flaming Gorge Hydrograph
Single FG “Trace”
All FG Releases
Slide9Yampa Daily Disaggregated Spring Peak Flows
Yampa daily disaggregation meets daily spring peak flow of 14,000
cfs
is projected 40% of the time. Adding FG power plant capacity of 4,600 cfs results in recommended 18,600 cfs at Jensen.
Slide10Jensen Daily Peak Flow Hydrograph
Spring flows meet one-day peak requirement of 18,600
cfs
at least 40% of the time
Slide11Jensen Daily 14-Day Duration Hydrograph
Static FG start date impacts the ability to model meeting at least 14 days at 18,600
cfs
40% of the time
Slide12Enhancements and future development
Green River Model
Slide13Green River Model Rule Updates
Calculations are done in March before spring peak and no longer need proportional data
Allows peak to occur in April
Demands are 2007 UCRC depletions
Daily disaggregation of Yampa River spring flows
April-July period using same data
Flaming Gorge daily hydrograph
Record of Decision rule set
Releases start 3 days before maximum Yampa peak
April-July daily flows summed to monthly outflow
Daily Base Flows are averaged monthly data
Slide14Green River Model Development
Updated rules are limited in
hydrologically
extreme years
ISM run aborts in minimum release and flood control situations
Dynamic FG peak release to assist in scenario development
LTSP
Basin Study scenarios
Potential to optimize release magnitudes and durations to conserve water and meet flow targets
Utilize Basin Study inflow hydrology and demand scenarios
Slide15Flaming Gorge Working GroupAugust 2012
Questions?
Slide16Slide17Slide18Slide19Slide20
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