9705

• UCREFRP Catalog Number: 9705
• Author: Green River Study Plan ad hoc Committee.
• Title: Study plan for the implementation and evaluation of flow and temperature recommendations for endangered fishes in the Green River downstream of Flaming Gorge Dam.
• USFW Year: 2007.
• USFW - Doc Type: Upper Colorado River Endangered Fish Recovery Program
• Copyright Material: NO

GREEN RIVER STUDY PLAN

22

February 2, 2007

Table 2. Continued.

Primary Studies Topic Not
Addressed by
Anticipated Effects and Uncertainties (Hypotheses) That Address Studies (information
Hypothesis needs)
Floodplains in Reach 2. Continued.
U15. Rates of sediment deposition and erosion in breaches and . Cap 6 HYD . Monitoring of
floodplain depressions as a function of breach configuration, . Western aerial geomorphic changes
peak: flow, and connecting flow magnitude and duration (Muth photography through time.
et al. 2000). . Stocked fish
evaluation
. Project 85f
. Evaluation of
restoration and
management
options for Ouray
NWR
Ull. The frequency of connection needed to successfully recruit . Cap 6-rz . Movement of
razorback sucker larvae into the adult population, including the . Cap 6-bt/rz subadult RBS into
frequency needed to sustain adequate water quantity and quality . Cap 6-rz/bt the river.
and allow escapement of subadults and adults to the main . Stocked fish . Habitat quality.
channel (U.S. Department of the Interior and Western Area evaluation
Power Administration 2005). . Evaluation of
restoration and
management
options for Ouray
NWR
UlO. Temporal relationships between drifting larvae and . Cap 6-rzlentr . None.
hydrology during the runoff period with a focus on the peak: . Project 22f
flow characteristics (magnitude, duration, ramp rate) needed to
entrain most drifting larvae (U.S. Department of the Interior and
Western Area Power Administration 2005).
U5. The area of terrace and depression floodplains inundated at . Cap 6 HYD . None.
different flows (U.S. Department of the Interior 2006). . Western aerial
photography
U14. For a given volume, what is the optimum combination of . Cap 6-rzientr . None.
flow magnitude and duration to maximize larval fish . Cap 6 HYD
entrainment (e.g., lower peak: flows for a longer duration could . Western aerial
maintain connection to floodplain nursery habitats for a longer photography
period of time and entrain as many or more razorback sucker . Project 22f
larvae as higher peak: flows for shorter duration. With recent . Evaluation of
modifications of levees and intake structures, flows less than the restoration and
recommended 18,600 cfs may provide significant connection management
and inundation to floodplain nursery habitats, and subsequent options for Ouray
entrainment of razorback sucker larvae; u.S. Department of the NWR
Interior and Western Area Power Administration 2005).