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<br />NATURAL ENVIRONMENT SURVEY <br /> <br />Survey Date: 9130/86 <br /> <br />''''[1 <br />';<:'~ <br />-.: <br /> <br />Survey Location: <br />Survey Summary: <br /> <br />1000' uls of Twin Lakes <br />150' electrofished. Sample included: 26 brook trout (2"-7"), 4 rainbow trout (4"- ... <br />7") and 1 cutthroat trout (10"). ., <br />brook, rainbow and cutthroat trout fishery. <br /> <br />Basis forISF: <br /> <br />FIELD SURVEY <br /> <br />Survey Date: 9130/86 <br /> <br />Method Used: R2X <br />Measured Flow (cfs): 1.63 <br />Survey Location: NE S30 TllS R80W 6PM <br />Notes: 1000' uls of Twin Lakes <br /> <br />Grassline Width (ft): 7.2 <br />PHOTOS: 4 <br /> <br />WATER AVAILABILITY <br /> <br />Method: <br /> <br />The Boswell Gulch hydrograph was derived as per the USGS WRI Report 85-4086 (Mountain <br />Region). See hydrograph below. The winter instream flow recommendation was reduced to <br />0.35 cfs (2/15-4/14) based on the water availability analysis. As per the Division 2 Engineer, <br />senior water rights do not present a water availability problem within this reach of stream. <br /> <br />OCT NOV DEC <br />1,5 0.9 0.6 <br /> <br />MEAN MONTHLY FLOWS (cfs) <br />JAN FEB MAR APR MAY JUN <br />0.5 0.5 0.4 0.4 1.8 31. <br /> <br />JUL <br />13. <br /> <br />AUG SEP <br />4.4 2,3 <br /> <br />Boswell Gulch <br />SYNTH~IC HYDROGRAPH <br /> <br />5 <br /> <br /> <br />~ 4 <br />~ <br />~ <br />it 3 <br />~ <br />:I: <br />I- <br />Z 2 <br />o <br />::;; <br />z <br />~ 1 <br /> <br /> <br />--------- <br /> <br />------ <br /> <br /> <br />----- <br /> <br />o <br /> <br />OCT NOV DEC JAN FEB MAR APR MAY JUN <br />MONTH <br /> <br />JUL AUG SEP OCT <br /> <br />IbOSW ell2_w k41 <br /> <br />- ewes ISF AMOUNT <br />