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San Juan Dolores Draft Instream Flow Recommendation
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San Juan Dolores Draft Instream Flow Recommendation
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Last modified
11/2/2015 3:29:11 PM
Creation date
2/6/2015 2:31:17 PM
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Template:
Water Supply Protection
Description
Related to the proposed Delores River ISF near Gateway from BLM to Linda Bassi, CWCB
State
CO
Basin
San Juan/Dolores
Date
5/14/2013
Author
Roy Smith
Title
DRAFT INSTREAM FLOW RECOMMENDATION
Water Supply Pro - Doc Type
Project Overview
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BLM and CPW staff also ran data from the seven cross sections through the R2Cross model. <br /> Since the seven cross sections include only one cross section of riffle habitat, CPW and BLM <br /> staff also collected data from four additional representative riffle cross sections at other locations <br /> on the river. The additional cross section data collection was designed to increase the reliability <br /> of the R2Cross model in predicting hydraulic characteristics that would be experienced at <br /> various flow rates within the 34-mile reach. <br /> The initial recommendations based on the PHABSIM and R2Cross modeling are designed to <br /> address the unique biologic requirements of this stream reach without regard to water <br /> availability. In addition to the criteria developed using the PHABSIM Methodology and <br /> RHABSIM Software, the three standard instream flow hydraulic parameters used in R2CROSS <br /> (average depth, percent wetted perimeter and average velocity) were also used to calculate and <br /> inform the biologic instream flow recommendations. <br /> Application of Habitat Suitability Criteria <br /> Habitat suitability criteria (HSC) were developed from the 2003 Riverine Fish Flow <br /> Investigation Study Report (Federal Aid Project F-289-R6) written and performed by Richard <br /> Anderson, CPW Aquatic Researcher, and Gregory Stewart, Department of Geosciences Oregon <br /> State University'. The basis for this study was a 1999 request from the CWCB for the CPW to <br /> provide biologically justified instream flow recommendations for the Yampa and Colorado <br /> Rivers based on habitat and flow requirements for non-endangered native fish. Anderson and <br /> Stewart used two—dimensional (2D) modeling to develop habitat suitability criteria for bluehead <br /> and flannelmouth suckers, two native species. Their methods and results are more fully <br /> described in Anderson and Stewart(2003) and Stewart and Anderson(2005)and(2006). <br /> The bluehead and flannelmouth sucker habitat suitability criteria were used to develop specific <br /> hydraulic criteria that were incorporated into a PHABSIM/RHABSIM analysis. Stewart and <br /> Anderson determined that "Abundance of bluehead sucker was a reliable indicator for instream <br /> flows and habitat maintenance for the native fish assemblage. In the Colorado, Gunnison and <br /> Yampa Rivers bluehead sucker habitat peaked at flows of 600 to 1,200 cfs. This flow range also <br /> resulted in high habitat diversity and high native fish biomass." Their assumption that flows that <br /> maintained adequate bluehead sucker abundance (about 25% of fish over 15 cm) would also <br /> maintain adequate flannelmouth sucker and roundtail chub habitat was validated by this study. <br /> CPW and BLM determined that the flannelmouth sucker and bluehead sucker would be the <br /> primary indicator species for the biologically based instream flow recommendation. The reason <br /> for considering the needs of both species is that they have somewhat different habitat <br /> preferences. Flannelmouth sucker have stronger preference for pool, glide, and run habitats, <br /> while bluehead sucker abundance is directly related to availability and quality of riffle habitats. <br /> Roundtail chub primarily utilize habitats with slower velocities, typically found in pools. CPW <br /> and BLM determined that if sufficient flows were protected for flannelmouth sucker and <br /> ' See"Impacts of stream flow alterations on native fish abundance and native fish habitat and the use of native fish <br /> population data to support instream flow recommendations made using a 2D instream flow methodology." <br />
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