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<br />58
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<br />FLOODS OF SEPT. 1970 IN ARIZ., UTAH, COLO., AND N. MEX.
<br />(19) 09343000. Rio Blanco near Pagosa Springs. Colo.
<br />Location. --Lat 37"12'46", long 106"47138", in center of sec. I, T. 34 N., R. 1 E..
<br />Archuleta County. on right bank 40 ft (12 m) downstream from highway bridge. 0.4 mi
<br />(0.6 km) upstream from Leche Creek. 1. 5 mt (2. 4 kIn) downstream from Fish Creek,
<br />and 12. 5 mi (20. 1 Ian) southeast of pagosa Springs.
<br />Drainage area. --58. 0 mi2 (150.2 km2).
<br />
<br />STATION DATA-SAN JUAN RIVER BASIN
<br />
<br />5'
<br />
<br />Gage-height record. --Water-stage recorder graph. Altitude of gage is 7,950 ft
<br />(2,423 m), from topographic map.
<br />
<br />(20) 09344000. Navajo River at Banded Peak Ranch, near Chroma, Colo.
<br />
<br />Location. --Lat 37"05'07", long 106041'20". in Nwt sec. 24, T. 33 N.. R.2 E..
<br />Archuleta County, on left bank at downstream side of private bridge on Banded Peak
<br />Ranch, 0.5 mt (0.8 kIn) downstream from Aspen Creek, 4 roi (6 kIn) downstream
<br />from East Fork; and 9 roi (14 km) northeast of Chromo.
<br />
<br />Drainaj;!e area. --69. 8 mi2 (I80. 8 km2).
<br />Gage-heiJ;t"ht record. --Water-stage recorder graph. Datum of gage is 7,940.6 ft
<br />(2,420.29 m) above mean sea level (river-profile survey).
<br />
<br />Dischar e record. --Stage-discharge relation defined by current-meter measurements
<br />below 490 ft s (l4 m3/s), by float-area measurement at 706 ft3/s (20.0 m3/s), and
<br />by flow over dam computation at 2, 500 ft3/s (70. 8 m3/s).
<br />
<br />Discharg:e record. --Stage-discharge relation defined by current-meter measurements
<br />below 840 ft;j/s (24 m3/s).
<br />Maxima. --Sept. 4-18, 1970: Discharge, 1,350 ft3/s (38.2 m3/s) 1000 hours Sept. 14
<br />~ height. 4.50 it or 1. 372 m).
<br />1936 to August 1970: Discharge, 1,340 ft3/s (37. 9 m3/s) May 13, 1~41 (gage
<br />height, 7.02 it or 2. 140 m, present datum).
<br />Maximum flood known occurred Oct. 5, 1911.
<br />
<br />Maxima. --Sept. 4-18, 1970: Discharge, 2,500 ft3/s (70. 8 m3/s) 0330 hours Sept. 6
<br />~ height, 3.70 ft or 1. 128 m).
<br />1935 to August 1970: Discharge, about 1,600 ft3/s (45 m3/s) July 26 or 27, 1957;
<br />gage height, 4.12 ft (1. 256 m) June 18, 1949.
<br />Maximum flood known prior to September 1970 Occurred on Oct. 5, 1911.
<br />
<br /> Mean discharge, in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 52 Sept. . 105 Sept. 14 1,030
<br /> 5 247 10 83 15 436
<br /> 6 610 11 75 16 266
<br /> 7 202 12 103 17 201
<br /> 8 142 13 642 18 162
<br />
<br /> Mean discharge, in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 42 Sept. 9 108 Sept. 14 652
<br /> 5 521 10 78 15 516
<br /> 6 1,070 11 60 16 328
<br /> 7 270 12 133 17 228
<br /> 8 14. 13 785 18 188
<br />
<br />Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1970
<br />
<br />G g 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. 6*-Con. Sept. 13*-Con.
<br />2400 0.78 26 1030 2.70 790 1130 2.85 1,240
<br />Sept. 4* 1300 2.85 880 1230 2.95 1,360
<br />1300 ,79 27 1600 2.68 660 1430 2.44 790
<br />1700 .90 37 2030 2.68 636 1600 2.62 .70
<br />1830 1.11 62 2400 2.53 448 1730 2.85 1,240
<br />2030 1.11 62 Sept. 7 1930 2.95 1,360
<br />2130 1.32 105 0600 2.34 320 2200 2.52 870
<br />2400 1. 30 100 1200 2.23 245 2330 2.87 1,260
<br />Sept. 5* 2100 2. 11 185 2400 2.79 1,170
<br />0400 1. 05 54 2400 2.10 173 Sept. 14*
<br />0800 , '6 45 Sept. 11 0100 3.05 1,500
<br />1100 1. 00 48 2400 1. 24 54 0230 2.67 1,020
<br />1300 1.35 112 Sept. 12* 0500 2.50 850
<br />1400 2.23 540 1130 1.23 53 0630 2.52 870
<br />1500 2.43 730 1400 1. 30 62 0800 2.97 1,390
<br />1630 2.28 604 1700 1. 50 102 1000 2.52 870
<br />1730 3.10 1,500 1900 2.02 295 1430 2.22 596
<br />1830 3.28 1,770 1930 2.42 572 1630 2.33 684
<br />2100 2.80 1,120 2100 2.15 400 2400 2.20 580
<br />2200 2.28 604 2200 1.87 270 Sept. 15*
<br />2400 2.33 644 2400 1.66 200 0600 2.12 508
<br />Sept. 6* Sept. 13* 1000 2.17 540
<br />0100 2.52 820 0130 1.81 280 1830 2.12 -<92
<br />0230 3.61 2,340 0330 1.63 212 2400 2.02 418
<br />0330 3.70 2,500 0600 2.15 516 Sept. 16*
<br />0700 3.35 1,640 0730 1. 93 376 0600 1. 94 364
<br />0800 2.90 1,220 0930 1. 87 346 1200 1. 88 325
<br /> 2400 1. 76 265
<br />
<br />a .
<br /> Gage Discharge Hour Gage Discharge Hour Gage Discharge
<br />Hour height height height
<br />Sept. 3 Sept. 6* Con. Sept. 13* Con.
<br />2400 1. 95 44 2100 2.97 384 1700 3.90 805
<br />Sept. 4 2400 2.88 300 1800 4.35 1,130
<br />0600 1. 96 45 Sept. 7 1830 4.08 926
<br />1200 1. 97 48 0600 2.67 222 1930 4.28 1,070
<br />1800 2.06 55 1200 2.55 186 2230 4.07 '19
<br />2400 2.24 78 1800 2.50 171 2245 4.25 1,050
<br />Sept. 5* 2400 2.46 180 2400 4.17 98.
<br />0600 2.11 61 Sept. 11 Sept. 14
<br />1330 2.33 89 2400 2.02 70 0200 4.25 1,070
<br />1500 2.70 180 Sept. 12* 0300 4.20 1,040
<br />1630 3.73 624 1200 2.03 72 0500 4.33 1,160
<br />1730 3.63 575 1600 2.06 75 0700 4.31 i.160
<br />1900 3.88 733 1900 2.40 140 1000 4.50 1,350
<br />2130 3.58 575 2000 2.40 140 1300 4.33 1,200
<br />2400 2.95 288 2100 2.90 300 1700 4.16 912
<br />Sept. 6* 2400 2.48 160 1900 4.17 787
<br />0100 2.90 268 Sept. 13* 2400 4.09 624
<br />0200 3.14 384 0130 2.41 142 Sept. 15*
<br />0400 3.96 857 0500 2.60 195 0300 4.07 560
<br />0700 4.30 1,160 0700 3.15 402 1300 4.03 440
<br />0900 4.13 1.030 0900 2.98 332 1800 3.93 352
<br />1100 3.62 891 1130 3. 85 775 2400 3.90 320
<br />1500 3.21 475 1430 4. 20 1,010
<br />
<br />* Daily means computed from data 1D addItion to figures shown.
<br />
<br />*Daily means computed from data 1D addItion to figures shown.
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