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<br />68
<br />
<br />FLOODS OF SEPT. 1970 IN ARIZ., UTAH, COLO., AND N. MEX.
<br />
<br />STATION DATA-SAN JUAN RIVER BASIN
<br />
<br />Los Pinos River near Bayfield, Colo.-Continued
<br />
<br />(32) 09355000. Spring Creek at La Boca, Colo,
<br />
<br />Maxima. --Sept. 4-18, 1970; Discharge. 1,430 ft3/s (40.5 m3/s) Sept. 16, 17 (gage
<br />height. 3.33 ft or 1. 015 m).
<br />1927 to August 1970; Discharge. 13,800 ft3/s (391 m3/s) July 27, 1957 (gage
<br />height, 12.2 ft or 3. 72 ro, from noodmarks at supplementary gage), from rating
<br />curve extended above 2,500 a3/s (71 m3/s) on basis of slope-area measurement of
<br />peak flow (result of automatic spillway gates releasing from Vallecito Reservoir).
<br />Maximum flood known prior to construction of Vallecito Reservoir occurred
<br />Oct. 5, 1911.
<br />
<br />Location. --Lat 37"00'46", long 101"35'42", in S~ sec. IS, T. 32 N.. R. 7 W.. La Plat
<br />County. on right bank in an excavated channel, 0.2 roi (0. 3 km) upstream from mo
<br />and 0.2 mi (0. 3 km) east of La Boca.
<br />
<br />DrainaRe area, --58 mi2 050 ~21. approximately,
<br />
<br />Gage-height record. --Digital recorder tape punched at IS-minute intervals. Altitude I
<br />gage is 6,160 ft (1,878 m), from topographic map.
<br />
<br />Mean discharge, in cubic feet per second, 1970
<br />
<br />Discharge record. --Stage-discharge relation defined by current-meter measurement!
<br />below 160 ft3/s (4. 5 m3/s) and by field estimate at 1,980 ft3/s (56. I m3/s). I
<br />Maxima. --Sept, 4-18, 1970: Discharge, 1,980 ft3/s (56.1 m3/s) 0415 hours, Sept. 6
<br />(gage height, 4.62 ft or 1. 408 m).
<br />1950 to August 1970: Discharge, 595 (t31s (l6, 9 m3/s) Mar, 22, 1969 (gage
<br />height, 2,90 ft or 0,884 m), from rating curve extended above 100,It3fs (2.8 m3/s
<br />gage height, 5,98 it (1. 823 m) Mar. 9, 1960 (iCE> jam). "
<br />
<br />Remarks. --Floodnow regulated by Vallecito Reservoir (see station 09353000).
<br />
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 570 Sept. 9 399 Sept. 14 1,050
<br /> 5 457 10 514 15 1,250
<br /> 6 271 11 625 16 1,430
<br /> 7 216 12 664 17 1,430
<br /> 8 268 13 744 18 1,420
<br /> (31) 09354500. Los Pinos River at La Boca. Colo.
<br />
<br />Mean discharge, in cubic feet per second, 1970
<br />
<br />Day Discharge Day Discharge Day DischargE
<br />Sept, 4 68 Sept. 9 46 Sept. 14 220
<br /> 5 303 10 57 15 44
<br /> 6 778 11 62 16 31
<br /> 7 64 12 72 17 27
<br /> 8 49 13 84 18 31
<br />
<br />Location. --Lat 3rOO'37", long 107"35'49", in 5! sec. 15, T. 32 N.. R. 7 W.. La Plata
<br />County, on downstream end of right abutmenl of the Denver and Rio Grande Western
<br />Railroad Co. bridge, at southeast edge of La Boca, 0.1 mi (0. 2 km) upstream from
<br />Spring Creek, and 13 mi (21 km) upstream from mouth,
<br />
<br />Drainage area. --510 mi2 (1,320 km2), approximately.
<br />
<br />Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 197
<br />of Spring Creek at La Boca, Colo.
<br />
<br />Gage-hei~ht record. --Digital recorder tape punched at IS-minute intervals. Datum of
<br />gage is 6, 143,58 it (1,872.563 m) above mean sea level.
<br />
<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Discha
<br /> height height height
<br />Sept. 5' Sept. 6*-Con. Sept. 13*-Con.
<br />0200 1. 60 100 0600 4,11 1,540 2000 1.25 9
<br />1000 1. 65 110 0800 3.82 1,310 2400 1.31 Ie
<br />1400 1. 86 160 1200 2.63 522 Sept, 14'
<br />1800 2,80 560 1400 2,04 292 0400 1. 24 ,
<br />2000 3. 11 746 1800 1.58 156 0600 1.96 "
<br />2200 3.04 704 2400 1. 29 9a OBOO 1.84 22
<br />2400 3.45 1,000 Sept. 7' 1000 2.63 51
<br />Sept. 6' 1200 1.11 66 1200 2.37 41
<br />0200 3. 89 1.360 2400 1. 04 54 1600 1.61 H
<br />0400 4.48 1,830 Sept. 13' 2000 1.21 ,
<br />0415 4.62 1. 980 1400 1.13 66 2400 1. 10 ,
<br />
<br />*DaUy means computed irom data In additIOn to fIgures shown.
<br />
<br />DischargE> record. --Stage-discharge relation defined by current-meter measurementa.
<br />
<br />Maxima. - -Sept. 4-18, 1970: Discharge, 4,160 ft3/s (118 m3/s) 0645 hours Sept. 6
<br />(gage height, 7.68 ft or 2.341 m).
<br />1950 to August 2970: Discharge, 6,400 ft3/s (181 m3/s) ,July 27, 1957 (gage
<br />height, 8.95 ft or 2. 728 m), from rating curve extended above 5,100 ft3/s (140 m3/s>.
<br />A major nood occurrE>d Oct, 5, 191 t, at thi~ location.
<br />
<br />Remarks. --Floodflow regulated by Vallccito Res('rvoir since 1941 (~station
<br />09353000).
<br />
<br />Mean discharge, in cubic feet per second, 1970
<br />
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 178 Sept. 9 172 Sept. 14 I. 110
<br /> 5 572 10 263 15 1,320
<br /> 6 1,640 11 339 16 1,450
<br /> 7 270 12 441 17 1,430
<br /> a 167 13 579 18 1,400
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