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<br />64
<br />
<br />FLOODS OF SEPT. 1970 IN ARIZ., UTAH, COLO., AND N. MEX.
<br />
<br />STATION DATA-SAN JUAN RIVER BASIN
<br />
<br />6,
<br />
<br />(26) 09349500. Piedra River near Piedra, Colo.
<br />
<br />(27) 09349800. Piedra River near Arboles. Colo.
<br />
<br />Location. --Lat 37"13'20", long 107"20'32", in NwtNwt sec. 17, T. 34 N.. R.4 W..
<br />Archuleta County, on right bank O. 1 rot (0.2 Ian) downstream from bridge on U. S.
<br />Highway 160, 0.4 mt (0.6 lan) upstream from Yellow Jacket Creek, and 1. 5 mt
<br />(2,4 kIn) northwest of Piedra.
<br />
<br />Location. -~Lat 37005118", long 107"23'50", in NEtSWt sec. 21, T. 33 N.. R.5 W.,
<br />Archuleta County, on left bank 3 mt (5 kIn) downstream from Ignacio Creek. 5.2 mt
<br />(8.4 ktn) northeast of Arboles Post Orfie,e. and 8 mt (13 Ian) upstream from mouth.
<br />
<br />Drainage area. --629 mi2 (1.629 km2),
<br />
<br />Drainae:e area. --371 mi2 (961 km2).
<br />
<br />GaJ.;!e-heiflht record. --Digital recorder tape punched at 30-minute intervals. Altitude 01
<br />gage is 6,147.52 ft (1,873.764 m). from Colorado State Highway Department bench
<br />mark.
<br />
<br />Ga$!'e-heijlht record. --Water-stage recorder graph. Altitude of gage is 6,510 ft
<br />(I, 984 m), from topographic map.
<br />
<br />DisCharge record. - -Stage-discharge relation defined by current-meter measurements
<br />below 2, 300 ft"j/s (65 m3/s) and by slope-area measurement at 7,980 ft3/s
<br />(226 m3/s).
<br />
<br />Discharjle record. --Stage-discharge relation defined by current-meter measurements
<br />below 3, 100 ft"j/s (88 m3/s) and extended above on basis of slope-area measurement
<br />of peak flow.
<br />
<br />Maxima. --Sept. 4-18, 1970: Discharge, 7,980 ft3/a (226 m3/s) 0700 hours Sept. 6
<br />(gage height, 7.92 ft or 2.414 m in gage well; 9.40 ft or 2.865 m, from floodmarks),
<br />from rating curve extended above 2,300 ft3/s (65 m3/s) on basis of slope-area
<br />measurement of peak flow.
<br />1938 to August 1970: Discharge, 6,870 ft3/a (195 m3/a) July 26, 1957 (gage
<br />height, 8.60 ft or 2. 621 m, site and datum then in use), from rating curve extended
<br />above 2,800 ft3/s (79 m3/s).
<br />Maximwn flood known occurred Oct. 5, 1911 (discharge not determined).
<br />Another major flood occurred June 29, 1927.
<br />
<br />Maxima. --Sept. 4-18. 1970: Discharge, 8,370 ft3/a (237 m3/s) 1130 hours Sept, 6
<br />(gage height, 6.38 ft or 1.945 m recorded; 7.55 ft or 2. 301m, frorn...noodmarks).
<br />1962 to August 1970: Discharge, 4,000 {t3/s (113 m3/s) Apr. 23, 1965 (gage
<br />height,S. 20 ft or 1. 585 m).
<br />Other major floods occurred Sept. 5 or 6, 1909 and Oct. 5, 1911.
<br />
<br /> Mean discharge. in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 134 Sept. 9 878 Sept. 14 3,370
<br /> 5 508 10 652 15 2.650
<br /> , 5,360 11 532 16 1,630
<br /> 7 2,340 12 440 17 1.160
<br /> 8 1,291) 13 1,1)90 18 92B
<br />
<br /> Mean discharge, in cubic feet per second. 1970
<br />D8Y Discharge Day Discharge Day Discharge
<br />Sept. 4 135 Sept. 9 782 Sept. 14 3,080
<br /> 5 737 10 575 15 2.280
<br /> 8 5,180 11 44' IB 1.480
<br /> 7 1,940 12 391 17 1,060
<br /> 8 1,070 13 1.380 18 788
<br />
<br />Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1970,
<br />of Piedra River near Arboles, Colo.
<br />
<br />Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1970,
<br />of Piedra River near Piedra, Colo.
<br />
<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Dischargt
<br /> height height height
<br />Sept. 5- Sept. 6*-Con. Sept. 13*-Con.
<br />0200 1. 48 14B 2400 4.69 3,670 2400 4.14 2,660
<br />0600 2.07 370 Sept. 7- Sept. 14_
<br />1200 2.15 412 0600 4. 15 2.640 0400 4.05 2.520
<br />2000 2.21 448 1200 3.87 2,220 0800 4.35 3,010
<br />2200 3.31 1,340 1'400 3.81 2,120 1200 4.45 3,200
<br />2400 3.98 2,150 1600 3.73 2,010 1400 4.77 3,820
<br />Sept. ,- 1800 3.63 1,890 1600 4.87 4,050
<br />0400 4.81 3,930 2000 3.55 1.800 1800 4.91 4.140
<br />0600 5.76 6,330 2200 3.48 1.710 2000 4.86 4,030
<br />0800 6.02 7,090 2400 3.39 1,610 2200 4. 69 3,660
<br />1000 5. 98 7,000 Sept. 13- 2400' 4. 60 3,480
<br />1130 6.38 8.370 0200 1. 98 465 Sept. 15-
<br />1200 6.18 7,280 1200 2.29 B4B 0600 4.26 2,990
<br />1600 5.77 6,360 1600 3.01 1,230 1200 3.96 2,500
<br />2000 5.14 4,690 2000 3.77 2,110 2400 3.60 1,980
<br />
<br />* Daily means computed from data In addlhon to fIgures shown.
<br />
<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Discharge
<br /> height height height
<br />Sept. 3 Sept. 7- Sept. l3*-Con.
<br />2400 1.67 130 0200 4.89 2,670 2100 4.89 2,670
<br />Sept. 4- 0700 4. 43 2,130 2400 4.65 2,380
<br />1200 1.63 121 1200 4.23 1,930 Sept. '4-
<br />2100 1.75 150 2400 3.56 1,300 0500 4. 36 2,060
<br />2400 2.35 330 Sept. 8- 0800 4.50 2,200
<br />Sept. 5- 0600 3.39 1,160 1000 5.00 2.800
<br />0200 2. 50 406 1200 3.29 1,080 1300 5.60 3,660
<br />0400 2.60 44' 2400 3.00 870 1500 6.00 4,300
<br />1100 2.41 372 Sept. 11 1800 5.70 3,820
<br />1800 2.65 466 2400 2.12 398 2400 5.25 3,150
<br />2000 3.95 1,380 Sept. 12 Sept. 15_
<br />2400 5.60 3,660 0600 2.07 380 0400 5.00 2,800
<br />Sept. ,- 1200 2.05 372 1100 4.58 2,300
<br />0200 6.90 5,900 1800 2.08 383 1800 4.21 1,910
<br />0700 7.92 7,980 2400 2.28 4B2 2400 4.05 1,750
<br />1200 6.70 5,540 Sept. '3- Sept. IB-
<br />1500 6.05 4,380 0400 2.48 580 0600 3.90 1,610
<br />1700 5.56 3,600 0900 2.68 8'8 1200 3.76 1,480
<br />2200 5.27 3,180 1200 3. 39 1,160 1800 3.62 1,360
<br />2400 4.95 2,740 1600 4.23 1,930 2400 3.46 1,220
<br />
<br />* Daily means computed from data in addition to figures shown.
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