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51 <br />PLATTE RIVER BASIN <br /> <br />06729450 SOUTH BOULDER CREEK BELOW GROSS RESERVOIR NEAR COAL CREEK, CO <br /> <br />LOCATION.--Lat 39°56'18", long 105°20'53", NW1/4 sec. 28, T.1 S., R.71 W., Boulder County. Measures releases <br />from Gross Reservoir; which is filled by South Boulder Creek and transmountain diversions from Moffat <br />Tunnel. <br /> <br />DRAINAGE AREA AND PERIOD OF RECORD.—92.8 sq. mi. East Slope drainage (Moffat Tunnel West Slope drainage not <br />included); Oct. 1967 to present. <br /> <br />GAGE.--Data Collection Platform (DCP), shaft encoder and a continuous chart recorder in a concrete shelter and <br />concrete well at a 25-ft Parshall flume. The primary reference is an electric tape gage with a <br />supplemental outside staff gage on the right wingwall. Gage is owned and maintained by Denver Water Dept. <br />personnel. <br /> <br />REMARKS.--Primary record is hourly averages of 15-minute satellite data with chart back up. The record is complete <br />and reliable, except a short periods of ice-affected record on January 17, 29, 31 and February 6, 2008. <br />Gage heights during this ice period were easily interpreted due to the constant releases from the reservoir. <br />Flow values during this ice period were assumed to be the same as before and after the ice period. The <br />record is rated good, except for periods when the flow was below 15 cfs and ice-affect days which are <br />considered fair. The following days are rated fair: October 1-11 and 26-29, November 5-30, December 1- <br />15 and 29-31, 2007, January 1-31, February 1-7 and 23-29, March 1-16 and 20-24, 2008, due to low flows; <br />and, January 17, 29, 31, February 6, 2008, due to ice. Station maintained by Denver Water, operated by <br />Steve Barrett and Patrick Tyler and record developed by Patrick Tyler. <br /> <br />RATING TABLE.--STD25FTPF USED FROM 01-Oct-2007 TO 01-Oct-2008 <br /> <br /> DISCHARGE, IN CFS, WATER YEAR OCTOBER 2007 TO SEPTEMBER 2008 <br /> MEAN VALUES <br /> <br /> DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br /> <br /> 1 12 170 6.1 8.4 6.1 11 151 141 434 501 260 155 <br /> 2 9.8 225 6.1 8.4 6.1 9.7 150 133 451 501 260 153 <br /> 3 9.8 176 6.1 7.7 6.1 8.6 150 127 492 467 260 152 <br /> 4 9.7 66 6.1 7.2 6.1 11 149 127 510 448 261 156 <br /> 5 10 7.2 6.4 7.2 6.1 12 149 127 454 434 261 154 <br /> 6 9.7 6.6 6.7 7.2 6.1 12 150 127 407 421 280 153 <br /> 7 9.4 6.6 8.6 7.2 13 12 152 127 405 375 269 153 <br /> 8 9.5 6.6 9.8 7.2 40 12 153 134 403 334 247 155 <br /> 9 8.3 6.6 10 7.2 87 12 153 147 372 314 232 155 <br /> 10 7.2 6.5 11 7.2 109 12 153 150 328 291 225 153 <br /> 11 7.2 6.6 12 7.2 109 12 153 153 313 282 224 153 <br /> 12 50 6.6 12 7.2 173 12 153 152 331 282 226 153 <br /> 13 107 7.0 12 7.2 271 12 153 155 317 282 195 152 <br /> 14 179 7.2 12 7.2 306 12 153 152 303 282 170 153 <br /> 15 215 7.2 12 7.2 306 12 153 153 303 279 165 155 <br /> 16 273 7.2 87 7.7 304 12 156 151 346 284 137 153 <br /> 17 310 7.2 230 8.0 306 15 167 155 416 287 116 153 <br /> 18 312 7.2 334 8.4 306 17 168 157 486 287 132 152 <br /> 19 308 7.3 341 8.4 307 17 168 184 523 287 145 137 <br /> 20 280 7.8 339 8.4 306 14 168 234 558 287 151 125 <br /> 21 156 7.1 338 8.4 227 12 94 317 577 287 149 125 <br /> 22 71 6.1 339 8.4 47 12 37 380 576 287 149 127 <br /> 23 60 6.1 342 8.4 9.7 12 94 393 578 287 130 125 <br /> 24 60 6.1 342 8.4 8.8 12 128 392 563 287 118 123 <br /> 25 27 6.1 341 7.1 8.4 71 138 392 556 287 118 123 <br /> 26 7.8 6.1 339 6.1 8.4 134 143 374 551 287 118 124 <br /> 27 7.8 6.1 189 6.1 8.4 151 141 370 520 287 115 124 <br /> 28 7.8 6.1 43 6.2 8.4 151 141 373 501 271 140 124 <br /> 29 7.8 6.1 8.4 6.1 10 150 141 388 501 260 155 122 <br /> 30 58 6.1 8.5 6.1 --- 151 141 419 502 264 154 120 <br /> 31 87 --- 8.4 6.1 --- 151 --- 433 --- 264 154 --- <br /> <br />TOTAL 2686.8 810.4 3766.2 229.2 3315.7 1254.3 4300 7217 13577 9993 5716 4262 <br />MEAN 86.7 27.0 121 7.39 114 40.5 143 233 453 322 184 142 <br />AC-FT 5330 1610 7470 455 6580 2490 8530 14310 26930 19820 11340 8450 <br />MAX 312 225 342 8.4 307 151 168 433 578 501 280 156 <br />MIN 7.2 6.1 6.1 6.1 6.1 8.6 37 127 303 260 115 120 <br /> <br />CAL YR 2007 TOTAL 41721.8 MEAN 114 MAX 397 MIN 6.1 AC-FT 82760 <br />WTR YR 2008 TOTAL 57127.6 MEAN 156 MAX 578 MIN 6.1 AC-FT 113300 <br /> <br />MAX DISCH: 609 CFS AT 21:30 ON Jun. 25, 2008 GH 3.2 FT. SHIFT 0 FT. <br />MAX GH: 3.2 FT. AT 21:30 ON Jun. 25, 2008 <br /> <br />FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY RECORD.