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49 <br />PLATTE RIVER BASIN <br /> <br />BOULDER CREEK AT BOULDER, CO <br /> <br />LOCATION.--Lat 40° 00’ 53”, long 105° 16’ 49”, in SW SW Sec. 30, T.1N., R.70W., Boulder County, on right bank <br />in Central Park, 1 block West of the Broadway St. Bridge over Boulder Creek. Gage is located where the <br />center line from 11th St crosses Boulder Creek. <br /> <br />DRAINAGE AREA AND PERIOD OF RECORD.—N/A; May 2004 to present. <br /> <br />GAGE.--Data Collection Platform (DCP) and a Acububbler stage sensor in a 12-inch x 30-inch x 36-inch NEMA4 <br />enclosure. The control is a grouted rock dam. The primary reference is a staff gage placed on the <br />right side of the channel slightly downstream from the shelter. A single orifice line in 2-inch pipe <br />extends from the shelter past the stream staff and into the stream at about a 45° angle to the flow. <br />Orifice terminates in a gravel pack plastic muffler that is buried in the stream bed. <br /> <br />REMARKS.--Primary record is hourly averages of 15-minute satellite data. There is no backup record. Record is <br />complete and reliable, except for December 14, 26, 28, 2007, January 13-14, 17, 19, 22, 24, 29-31, <br />February 2, 3, 6-7, 2008, when the stage-discharge relationship was affected by ice. Record is good, <br />except for the periods of ice affected record, which are poor. Station maintained by Division I <br />Hydrographic Staff and record developed by Lee Cunning. <br /> <br />RATING TABLE.--BOCOBOCO03 USED FROM 01-Oct-2007 TO 30-Sep-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 23 27 19 16 19 13 18 41 258 283 55 32 <br /> 2 25 27 17 19 21 15 21 35 269 257 46 32 <br /> 3 29 27 20 21 18 13 21 34 296 255 47 25 <br /> 4 25 26 23 19 17 13 20 38 262 278 56 25 <br /> 5 22 26 22 21 17 12 21 38 261 268 63 24 <br /> 6 22 25 21 18 20 13 20 36 233 272 62 24 <br /> 7 22 24 22 16 17 13 22 48 210 270 76 21 <br /> 8 31 19 21 15 15 12 20 58 198 244 95 24 <br /> 9 26 17 15 16 15 11 21 55 178 206 89 19 <br /> 10 26 17 21 15 15 11 23 56 177 183 96 18 <br /> 11 25 16 23 15 15 11 21 54 184 175 94 22 <br /> 12 23 17 23 14 17 14 20 52 179 168 88 45 <br /> 13 23 19 21 14 19 15 21 67 177 167 66 41 <br /> 14 31 20 20 15 16 15 21 66 172 149 51 34 <br /> 15 28 17 14 16 15 15 26 73 184 125 63 32 <br /> 16 32 19 17 15 14 16 33 68 191 126 83 29 <br /> 17 29 18 18 17 16 14 30 63 179 116 77 25 <br /> 18 33 18 18 16 16 9.8 27 64 176 122 60 27 <br /> 19 26 18 18 15 15 15 29 89 173 107 54 32 <br /> 20 23 18 22 16 20 15 34 179 180 103 57 34 <br /> 21 22 17 21 16 20 15 39 229 183 101 48 38 <br /> 22 21 10 19 16 16 14 38 251 187 96 39 34 <br /> 23 23 13 20 17 15 12 41 228 207 98 34 31 <br /> 24 21 11 21 16 15 16 51 174 214 119 39 30 <br /> 25 23 17 20 17 15 19 58 147 190 109 40 29 <br /> 26 21 17 19 18 14 20 42 162 182 95 44 29 <br /> 27 20 18 19 18 12 24 37 185 179 79 38 27 <br /> 28 20 18 18 18 13 22 33 199 176 68 37 26 <br /> 29 23 17 17 20 13 21 25 241 216 75 29 25 <br /> 30 26 19 18 17 --- 23 29 262 290 63 31 25 <br /> 31 28 --- 17 18 --- 22 --- 262 --- 52 31 --- <br /> <br />TOTAL 772 572 604 520 470 473.8 862 3554 6161 4829 1788 859 <br />MEAN 24.9 19.1 19.5 16.8 16.2 15.3 28.7 115 205 156 57.7 28.6 <br />AC-FT 1530 1130 1200 1030 932 940 1710 7050 12220 9580 3550 1700 <br />MAX 33 27 23 21 21 24 58 262 296 283 96 45 <br />MIN 20 10 14 14 12 9.8 18 34 172 52 29 18 <br /> <br />CAL YR 2007 TOTAL 24890.0 MEAN 68.2 MAX 373 MIN 10.0 AC-FT 49370 <br />WTR YR 2008 TOTAL 21464.8 MEAN 58.6 MAX 296 MIN 9.8 AC-FT 42580 <br /> <br />MAX DISCH: 323 CFS AT 06:15 ON Jun. 4, 2008 GH 3.04 FT. SHIFT -0.09 FT. <br />MAX GH: 3.04 FT. AT 06:15 ON Jun. 4, 2008 <br /> <br />FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY RECORD. <br />