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<br />82
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<br />FLOODS OF SEPT. 1970 IN ARIZ., UTAH, COLO., AND N. MEX.
<br />
<br />STATION DATA-SAN JUAN RIVER BASIN
<br />
<br />83
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<br />(49) 09368000. San Juan River at Shiprock, N. Mex.
<br />
<br />(50) 09371000. Mancos River near Towaoc, Colo.
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<br />Location.__Lat36"47'52". longlOa043'52". inSW-fsec.22, T.30N., R.laW., San
<br />Juan County, on left bank, 3 roi (5 km) west of Shiprock and 6 roi 00 lan) downstream
<br />from Chaco River, and at mile 61. 0 (98. 1 lan).
<br />Drainage area. --12, 900 mi2 (33,400 Jon2), approximately.
<br />GaJ;{e-heip;ht record. --Water-stage recorder graph Sept. 4 to 0900 hours Sept. 8.
<br />Digital recorder tape punched at IS-minute intervals 0900 hours Sept. 8 to 2400 hours
<br />Sept. 18. Datum of gage is 4,848.68 ft 0.477.878 m) above mean sea level (river-
<br />profile survey).
<br />
<br />Location. --Lat 37"Ol'39r1. long 108"'44'27/1, in Nwt sec. 18, T. 32 N.. R. 17 W.,
<br />Montezuma County, on left bank 750 it (230 m) upstream from bridge on U. 5,
<br />Highway 666, 6 mi (10 kIn) upstream from Aztec Creek, and 12 mi (19 km)
<br />south of Towaoc,
<br />
<br />Drainage area. --550 mi2 ?t, 420 km2), approximately,
<br />
<br />Gage-height record, --Water-stage recorder graph. Datum of gage is 5,055,98 ft
<br />(1,541.063 m) above mean sea level.
<br />
<br />Discharge record, --Stage-discharge relation defined by current-meter measurements.
<br />
<br />Discharge record. --Stage-discharge relation defined by current-.meter measurements
<br />below 280 ft3/s (7.9 m3/s) and by slope-area measurement at 4,530 h3/s (128 m3/s),
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<br />Maxima. --Sept. 4-18, 1970: Discharge, 4,530 ft3/s (128 m3/s) 0500 hours Sept. 6
<br />(gage height, 8.50 it or 2. 591 m,in gage well; 8,72 ft or 2,658 m, frem noodmark),
<br />from rating curve extended above 280 it3/s (7. 9 m3/s) on basis of slope'flrea
<br />measurement of peak flow.
<br />1920-43, 1951 to August 1970: Discharge,S, 300 ft3/a (150 m3/s) Oct. 14, 1941
<br />(gage height, 7.30 it or 2,225 m, present site and datum), from rating curve
<br />extended above 200 !t3/a (5. 7 m3/a) on basis of slope-area measurement of peak
<br />flow.
<br />
<br />Maxima. --Sept. 4-18, 1970; Discharge. 13,900 ft3/a (394 m3/s) 1400 hours Sept. 7
<br />(gage height, 7,39 ft or 2.252 m); maximum gage height, 7.75 It (2,362 m) 1230 hours
<br />Sept, 6.
<br />1927 to August 1970: Discharge, about 80,000 ft3/s (2, 300 m3/s) Aug. 11, 1929
<br />(gage height, 5,7 ft or 1. 74 m, site and datwn then in use).
<br />Maximum flood known occurred Oct. 6, 1911, and reached a stage of 22 it (6. 7 m),
<br />site and datum then in use,
<br />
<br />Remarks, --Flow partly regulated by Navajo Reservoir since June 1962 (see station
<br />09355100).
<br />
<br /> Mean discharge, in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 3.3 Sept, 9 58 Sept. 14 140
<br /> 5 406 10 37 15 67
<br /> 6 1.890 11 28 16 39
<br /> 7 231 12 262 17 32
<br /> 8 85 13 573 18 26
<br />
<br /> Mean discharge, in cubic feet per second. 1970.
<br />Day Discharge Day Discharge Day Discharge
<br />Sept, 4 630 Sept. 9 3,140 Sept. 14 6,810
<br /> 5 1,650 10 2,670 15 6,120
<br /> 6 8,470 11 2,620 16 4,510
<br /> 7 11,300 12 2,740 17 3,630
<br /> 8 5,130 13 3,930 18 3,130
<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. 4 Sept. 7 Sept. 13-Con.
<br />2400 1. 47 4.1 0600 3.70 300 0600 3.84 352
<br />Sept. 5' 0800 3.61 246 0700 3.98 430
<br />0830 1. 44 3.5 0900 3. 59 222 1200 3,50 195
<br />0900 L 85 16 1200 3. 43 158 1900 3.24 120
<br />1030 2.51 86 1800 3.27 122 1930 3.48 160
<br />1200 2,40 71 2400 3.19 107 2300 3.29 100
<br />15'J0 2.07 31 Sept. 11 2400 3. 32 97
<br />1530 3.41 340 2400 2,53 24 Sept. 14*
<br />1800 2,99 189 Sept. 12 0400 3.24 85
<br />1900 4.29 844 0800 2.52 23 0600 3.32 97
<br />2030 5.60 1,900 1530 2.55 25 0900 3.49 128
<br />2300 5.64 1,930 1700 3.53 207 0930 4.50 505
<br />2400 5.12 1,520 1730 3,39 158 1200 3.65 165
<br />Sept. 6 1800 3.93 400 1730 3.17 75
<br />0100 4.89 1,330 1830 3.35 148 1800 3,57 145
<br />0230 4.89 1,330 1900 4.49 773 2130 3.32 97
<br />0330 4.95 1,380 2000 4.52 804 2200 3.42 115
<br />0500 8.50 4,530 2030 4.90 1,140 2400 3.37 106
<br />0800 7.00 3,020 2400 4.83 1,080 Sept. 15
<br />0900 5.77 1,960 Sept. 13 0600 3.18 76
<br />1300 5. 43 1,640 0030 5, 00 1.230 1200 3.08 62
<br />2000 5.41 1,590 0100 5.37 1,550 1800 3.00 52
<br />2100 4.85 1,100 0230 6.98 2,970 2400 2.96 47
<br />2400 4,20 590 0430 5.02 1,240
<br />
<br />* Daily means computed from data In addItIon to figures shoWn.
<br />
<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Discharge
<br /> height height height
<br />Sept. 5 Sept. 6-Con. Sept. 13-Con.
<br />0200 4.40 1, 120 2400 8. 95 10,210 1800 4.87 3,710
<br />0400 4.93 1,970 Sept. 7 2000 4.52 3,330
<br />0600 4.40 1,200 0200 7.14 11,350 2200 4. 57 3,430
<br />0800 4.19 1,020 0400 7. 44 13,330 2400 4.97 4,610
<br />1000 4.27 1,130 0600 7.14 11.770 Sept. 14
<br />1400 4. 40 1,390 0800 7.14 11,770 0200 5,05 4,910
<br />1600 4.67 1,840 1000 7.09 11.770 0400 4.96 4,580
<br />1800 4.70 1.950 1200 6.80 10.330 0600 5.04 4.820
<br />2000 4.63 1, B60 1400 7.39 13,930 0800 5. 66 6,850
<br />2200 5.15 2,970 1600 7.35 13,870 1000 5.63 6,730
<br />2400 5.35 3.410 1800 7.10 12,190 1200 5.77 7,290
<br />Sept. 6 2000 6.50 9,570 1400 5.93 7,930
<br />0200 5.37 3,500 2200 6.33 9,010 1600 6,02 8,290
<br />0400 6. 10 5,780 2400 6.09 8,130 1800 6.03 8,330
<br />0600 7.20 10.170 Sept. 13 2000 5.85 7.610
<br />0800 7.15 10,130 0200 4.25 2,790 2200 5.91 7,850
<br />1000 7. 65 13,030 0400 4.28 2,850 2400 5.74 7,170
<br />1200 7.70 13,510 0600 4.57 3.430 Sept, 15'
<br />1400 7.60 12,970 0800 5.46 6,080 0600 5,58 6,530
<br />1600 7,25 11,110 1000 5.09 4,970 1200 5.46 6,OBO
<br />1800 6.90 9,690 1200 5.24 5.420 1800 5.32 5,660
<br />2000 6.85 9,570 1400 4.83 4,190 2400 5.14 5,120
<br />2200 6.80 9,450 1600 4. 64 3,620
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<br />* Dally means computed from data In additIon to fIgures shown.
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