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<br />54
<br />
<br />FLOODS OF SEPT. 1970 IN ARIZ., UTAH, COLO., AND N. MEX.
<br />SAN JUAN RIVER BASIN
<br />
<br />STATION DATA~SAN JUAN RIVER BASIN
<br />
<br />55
<br />
<br />(IS) 09339900. East Fork San Juan River above Sand Creek,
<br />near pagosa Springs. Colo.
<br />
<br />(16) 09340000, East Fork San Juan River near Pagosa Springs. Colo.
<br />Location. --Lat 3~22110"., long 106053'30", in Nwtswt sec. 7, T. 36 N.. R. 1 E..
<br />Archuleta County, on right bank O. 2 mi (0. 3 lan) upstream from private highway
<br />bridge, 0.5 mi (0.8 km) upstream from West Fork, and 9.5 mi (15. 3 lan) northeast
<br />of pagosa Springs.
<br />Drainage area. --86. 9 mi2 (225. 1 krn2),
<br />GaJ;!e-height record. --Water-stage recorder graph. Datum of gage is 7,597.63 ft
<br />(2,315.758 m) above mean sea level.
<br />
<br />Location. --Lat 37"23'25", long 106050'25". in NEt sec. 4, T. 36 N., R. 1 E.. Archuleta
<br />County, on right bank 0.3 mi (0. 5 Ian) upstream from Sand Creek, 4 mi (6 tan) up-
<br />stream from West Fork San Juan River, and 13 mi (21 km) northeast of pagosa
<br />Springs.
<br />Drainage area. --64. 1 mi2 (166.0 tan2).
<br />Ga~e-heiJV1t record. --Water-stage recorder graph. Altitude of gage is 8,900 ft (2, 710 m),
<br />from topographic map.
<br />
<br />Dischar/{e record. --Stage-discharge relation defined by current-meter measurements
<br />below 1,500 ft;j/s (42 m3/s).
<br />
<br />Maxima. --Sept. 4-18, 1970: Discharge, 2,460 ft3/s (69. 7 m3/s) 0900 hours Sept. 14
<br />---cgage height, 4.85 ft or 1. 478 m); gage height,S. 08 ft (1.548 m) 0600 hours Sept. 6.
<br />1935 to August 1970: Discharge, 2,070 ft3/s (58.6 m3/s) May 12, 1941 (gage
<br />height, 4.84 it or 1. 475 m). "
<br />Flood of Oct. 5, 1911, exceeded all other known floods at this location.
<br />
<br />Dischar~e record. --Stage-discharge relation defined by current-meter measurements
<br />below 460 ft3/s (13 m3/s) and extended above on basis of Slope-area measurement
<br />at 1,710 ft3/s (48.4 mS/s).
<br />
<br />Maxima. nSept. 4-18, 1970: Discharge, 2,260 ft3/s (64.0 m3/s) 0930 hours Sept. 14
<br />(gage height, 6.75 ft ot' 2. 057 m).
<br />1956 to August 1970: Discharge, 1,210 ft3/s (34.3 m3/s) June 6, 1957 (gage height,
<br />6.32 it or 1.926 m).
<br />Flood of Oct. 5, 1911, exceeded all other known floods at this location.
<br />
<br /> M~an discharge. in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 48 Sept. 9 177 Sept. 14 1.500
<br /> 5 312 10 13B 15 685
<br /> 6 1.060 11 115 16 455
<br /> 7 354 12 152 17 364
<br /> 8 234 13 674 18 2B4
<br />
<br /> Mean discharge, in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 31 Sept. 9 117 Sept. 14 1,150
<br /> 5 205 10 85 " 535
<br /> 6 844 11 80 16 390
<br /> 7 275 12 101 17 294
<br /> B 158 13 466 18 226
<br />
<br />Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1970
<br />
<br />Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1970
<br />
<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Discharge
<br /> height height height
<br />Sept. 3 Sept. G.-Con. Sept. 13* Con.
<br />2400 1.53 32 2400 2.77 455 2200 3.63 1.100
<br />Sept. 4* Sept. 7* 2400 3.52 1,030
<br />1300 1.57 36 0600 2.63 392 Sept. 14*
<br />1700 1. 67 47 1200 2.52 344 0030 3.52 1,030
<br />1800 1. 86 74 2400 2.38 2B8 0200 4.06 1,480
<br />2400 1. 98 96 Sept. 11 0300 3.82 1,250
<br />Sept. 5* 2400 1.75 104 0330 4.13 1,550
<br />0500 1. 83 69 Sept. 12* 0430 3.91 1,330
<br />0600 1. 93 86 1200 1. 74 102 0530 4.12 1,540
<br />1100 1. 78 62 1800 1.93 146 0600 3.90 1,320
<br />1330 1. 95 90 1900 2.12 19B OBOO 4.72 2,280
<br />1400 2.50 234 2000 2.47 340 0900 4. 85 2,46.0
<br />1600 2.74 324 2130 2.32 280 1000 4.83 2,290
<br />1730 3.40 640 2200 2.45 332 1200 4.64 1,790
<br />1930 3.74 844 2400 2.25 256 1400 4.55 1,580
<br />2100 3. 81 886 Sept. 13* 1700 4.13 1,190
<br />2400 3.86 918 0300 2.07 195 2000 3.85 970
<br />Sept. 6* 0630 2.32 288 2100 4.04 1,080
<br />0300 4.45 1,350 1100 2.41 348 2400 3.87 958
<br />0600 5, DB 2,060 1200 3.10 705 Sept. "*
<br />0800 4.62 1,620 1600 3.55 1,050 0400 3.55 760
<br />0900 4.50 1,600 1630 3.44 976 0500 3.63 802
<br />1100 3.84 1,060 1700 3.70 1,160 1200 3.36 630
<br />1500 3.30 727 1900 3.94 1,360 1830 3.25 560
<br />1700 3.25 700 2030 3.95 1,370 2400 3.06 450
<br />. Daily means computed lrom data 10 addition to figures shown.
<br />
<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Discharge
<br /> height height height
<br />Sept. 4 Sept. 7 Sept. 13* Con.
<br />2400 2.98 49 0600 4.07 320 2000 5.30 1,040
<br />Sept. 5* 1200 3.96 270 2230 4.80 722
<br />0700 2.83 38 1800 3.84 218 2400 4.97 835
<br />1100 2.81 38 2400 3.78 194 Sept. 14*
<br />1500 3.15 65 Sept. 11 0100 5.10 933
<br />1600 3.80 202 2400 3.22 74 0200 4.97 849
<br />1830 4.59 584 Sept. 12* 0300 5.65 1,330
<br />1930 4.66 632 1200 3.22 74 0400 5.03 891
<br />2030 4.61 608 1500 3.26 79 0600 5.20 1,010
<br />2100 4.66 644 1900 3.50 120 0730 5.57 1,270
<br />2300 4.45 530 2000 3.64 152 0830 6. 00 1,610
<br />2400 4.70 680 2130 3.92 250 0930 6.75 2,260
<br />Sept. 6* 2400 3.62 148 1100 5.96 1,550
<br />0100 4.60 620 Sept. 13* 1300 5.50 1,250
<br />0330 5.43 1,170 0200 3.53 126 2000 4.94 884
<br />0600 6.13 1,710 0500 3.59 140 2400 4.85 828
<br />0700 5.90 1,530 0730 3.82 210 Sept. 15*
<br />0900 5.38 1.140 1030 3.73 178 0200 4.78 782
<br />1100 5.06 905 1400 4.92 776 0500 4.48 602
<br />1400 4.72 6BO 1600 4.72 656 1500 4.20 455
<br />2400 4.20 390 1800 4.80 704 2400 4.15 430
<br />
<br />. Daily means computed from data 10 addlhon to flgures shown.
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