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ISFAPPC00626
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ISFAPPC00626
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Last modified
3/31/2017 2:46:10 PM
Creation date
10/5/2006 10:29:15 PM
Metadata
Fields
Template:
Instream Flow Appropriations
Case Number
03CW0039
Stream Name
Garner Creek
Watershed
Closed Basin
Water Division
3
Water District
25
County
Saguache
Instream Flow App - Doc Type
Supplemental Data
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<br />"Garner Creek is a small, headwater stream that drains the western slope of the Sangre de Cristo <br />mountains and disappears into the Closed Basin of the San Luis Valley. These characteristics <br />alone make it a candidate for introduction of Rio Grande Cutthroat Trout... Garner Creek has a <br />resident population of reproducing brook trout" (See BLM Fish Survey in Appendix B). <br /> <br />Field Survey Data <br /> <br />BLM staff used the R2Cross methodology to quantify the amount of water required to preserve <br />the natural environment to a reasonable degree. The R2Cross method requires that stream <br />discharge and channel profile data be collected in a riffle stream habitat type. Riffles are most <br />easily visualized, as the stream habitat types that would dry up first should streamflow cease. <br />This type of hydraulic data collection consists of setting up a transect, surveying the stream <br />channel geometry, and measuring the stream discharge. Appendix B contains copies of field <br />data collected for this proposed segment. <br /> <br />Biological Flow Recommendation <br /> <br />The CWCB staff relied upon the biological expertise of the cooperating agencies to interpret <br />output from the R2Cross data collected to develop the initial, biologic instream flow <br />recommendation. This initial recommendation is designed to address the unique biologic <br />requirements of each stream without regard to water availability. Three instream flow hydraulic <br />parameters, average depth, percent wetted perimeter, and average velocity are used to develop <br />biologic instream flow recommendations. The CDOW has determined that maintaining these <br />three hydraulic parameters at adequate levels across riffle habitat types, aquatic habitat in pools <br />and runs will also be maintained for most life stages of fish and aquatic invertebrates (Nehring <br />1979; Espegren 1996). <br /> <br />For this segment of stream, one data set was collected with the results shown in Table 1 below. <br />Table 1 shows who collected the data (Party), the date the data was collected (Date), the <br />measured discharge at the time of the survey (Q), the accuracy range of the predicted flows <br />based on Manning Equation (240% and 40% of Q), the summer flow recommendation based on <br />meeting 3 of 3 hydraulic criteria and the winter flow recommendation based upon 2 of 3 <br />hydraulic criteria. <br /> <br />Table 1: Data - Upper Segment <br />Party Date Q <br />BLM 8/2312001 1.76 <br /> <br />250%-40% <br />4.4 - 0.7 <br /> <br />Summer (3/3) <br />2.4 <br /> <br />Winter (2/3) <br />0.6 <br /> <br />BLM - Bureau of Land Management <br /> <br />Biologic Flow Recommendation <br />The summer flow recommendation, which meets 3 of 3 criteria and is within the accuracy range <br />of the R2CROSS model is 2.4 cfs. The winter flow recommendation, which meets 2 of3 criteria <br />and is within the accuracy range of the R2CROSS model is 0.6 cfs (See Table 1). <br /> <br />Hydrologic Data <br /> <br />After receiving the cooperating agency's biologic recommendation, the CWCB staff conducted <br />an evaluation of the stream hydrology to determine if water was physically available for an <br />instream flow appropriation. The hydro graph below was derived from data collected by the <br />State of Colorado stream gage for Garner Creek, CO (ill GARVILCO), which has a drainage <br />area of7.3 square miles. The total drainage area of the Gamer Creek Drainage is approximately <br />14 square miles. The period of record for this gage is 1998 to 2001, the period of record used by <br /> <br />- 3 - <br />
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