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<br />FLOODS OF SEPT. 1970 IN ARIZ" UTAH, COLO., AND N. MEX.
<br />(21) 09344300. Navajo River above Chroma, Colo.
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<br />STATION DATA~SAN JUAN RIVER BASIN
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<br />61
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<br />(22) Little Navajo River near Chroma, Colo.
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<br />Location. --Lat 3?-01'55", long 106"43'56", in NEt sec. 9, T. 32 N.. R.2 E.. Archuleta
<br />County, on right bank 6 rot (10 kIn) east of Chroma and 7mt (11 Ian) upstream from
<br />Little Navajo River.
<br />Drainajie area. --96." mi2 (249. 7.m2).
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<br />(Miscellaneous site)
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<br />Location. --Lat 37'"04'40". long 106"48'34". in Archuleta County, about 1,000 ft (300 m)
<br />upstream from Bureau of Reclamation diversion dam and 4 rot (6 kIn) northeast of
<br />Chroma.
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<br />Ga~-heiR"ht record. --Water-stage recorder graph. Altitude of gage is 7,700 n
<br />2,350 m), from topographic map.
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<br />Drainage area. --13. 6 mi2 (35.2 km2).
<br />Maximum. --Sept. 4-18, 1970: Discharge, 132 fi3/s (3. 74 m3/s) Sept. 6, 1970, by slope-
<br />area measurement of peak flaw.
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<br />Dischar~e record. - -Stage-discharge relation defined by current-meter measurements
<br />below 1,000 ft3/s (28 m3/s) and by float-area measurement at 1,320 ft3/a
<br />(37.4 m3/s). Discharge 1000 to 1700 hours Sept. 6. 1500 hours Sept. 13 to 2400
<br />hours Sept. 14, estimated an basis of records far Navajo River at Banded Peak
<br />Ranch, near Chroma.
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<br />(23) 09346000. Navajo River at Edith, Colo.
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<br /> Mean discharge, in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4 53 Sept. . lOB Sept. 14 1,100
<br /> 5 223 10 90 15 461
<br /> B 5B4 11 BO 16 260
<br /> 7 221 12 ., 17 204
<br /> B 144 13 840 IB 16B
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<br />Location. nLat 37"00'10", long 106054'25", in NWt sec. 24, T. 32 N., R. 1 W., Archuleta
<br />County, on right bank 290 it (88 01) downstream from highway bridge, ~. 2 mi (0. 3 Ian)
<br />southeast of Edith, 0.5 roi (0.8 lan) upstream from Colorado-New Mexico State line,
<br />and 1. 3 mi (2. 1 kIn) upstream from Coyote Creek.
<br />Draina~e area. --172 mi2 (445 km2).
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<br />GaRe-height record. --Water-stage recorder graph. Datum of gage is 7,033.00 it
<br />(2,143.658 m) above mean sea level (Bureau of Reclamation bench mark).
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<br />Maxima. --Sept. 4-18, 1970: Discharge, 1,400 ft3/s or 40 m3/s (estimated) 1230 hours
<br />-sept.' 14; gage height, 8.20 ft (2.499 m) 0830 hours Sept. 14 (backwater from
<br />diversion dam).
<br />1956 to August 1970: Discharge, 1,340 ft3/s (37.9 O13/s) June 7, 1957 (gage
<br />height, 5.95 ft or 1. 814 m); gage height, 6.13 ft (1. 868 01) during period Feb. 1-8,
<br />1957'(ice jam).
<br />Maximum flood known prior to September 1970 occurred on Oct. 5, 1911.
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<br />Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1970
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<br />Discharge record. --Stage-discharge relation defined by current-meter measurements
<br />below 650 ftij/s (18 m3/s) and extended above on basis of float measurement at gage
<br />height 5. 39 it (1.64301).
<br />Maxima. --Sept. 4-18, 1970: Discharge, 1,370 ft3/s (38. 8 m3/s) 1030 hours Sept. 14
<br />(gage height, 5.54 it or 1. 689 m, in gage well; 5.91 it or 1. 801 01, from floodmarks),
<br />from rating curve extended above 650 ft3/s (18 m3/s) on basis of float measurement
<br />at 1,190 it3/s (33. 7 m3/s).
<br />1935 to August 1970: Discharge, 2,840 ft3/s (80.4 m3/s) Apr. 23, 1942 (gage
<br />height, 6.55 it or 1. 996 01), from rating curve extended above 1,100 ft3/s (31 m3/s).
<br />Maximum flood known occurred Oct. 5, 1911.
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<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Discharge
<br /> height height height
<br />Sept. 4 Sept. 6-Con. Sept. 13*-Con.
<br />2400 3.65 85 0900 5.61 1.090 0700 4.09 180
<br />Sept. 5 0930 5.75 1.200 0800 4.40 320
<br />0200 3.70 73 1000 5.67 1,140 1200 4.47 382
<br />0900 3.62 82 1200 - 735 1400 5.03 679
<br />1300 3.65 65 1700 4.61 440 1500 5.12 742
<br />1500 3.80 BB 2000 4.50 3BO Sept. 14*
<br />1600 3.98 137 2400 4.36 300 1230 - 1,400
<br />1700 4.52 392 Sept. 11 2400 5.45 .80
<br />1800 4.93 618 2400 3.72 73 Sept. 15
<br />1900 4.85 567 Sept. 12 0500 5.02 644
<br />2300 4.90 60' 1600 3.75 7. 0600 4.82 512
<br />2400 4.61 440 2100 3.90 113 0800 4.64 404
<br />Sept. 6 2300 4.27 260 1100 4.56 358
<br />0200 4.43 33B 2400 4.21 230 1300 4.60 3BO
<br />0300 4.61 440 Sept. 13' 1800 4.52 332
<br />0700 5.17 770 0300 4.04 180 2400 4.46 300
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<br /> Mean discharge, in cubic feet per second, 1970
<br />Day Discharge Day Discharge Day Discharge
<br />Sept. 4" . 5' Sept. . 12B Sept. 14 1,060
<br /> 5 208 10 104 15 50.
<br /> 6 636 11 82 18 2.B
<br /> 7 276 12 .2 17 22'
<br /> 8 173 13 526 IB IB5
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<br />Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1970,
<br />of Navajo River at Edith, Colo.
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<br />*Daily means computed from data 10 addition to flgures shown.
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<br />Hour Gage Discharge Hour Gage Discharge Hour Gage Discharge
<br /> height height height
<br />Sept. 4 Sept. 6' Con. Sept. 13*-Con.
<br />2400 3.24 61 2400 4.23 350 1800 4.82 6B6
<br />Sept. 5' Sept. 7 1900 5.35 1,180
<br />0600 3.38 B2 0300 4.13 310 2200 5.02 B5B
<br />1400 3.38 B2 1000 4.08 2.0 2400 5.19 1.020
<br />1630 3.47 .7 1600 4.00 25B Sept. 14'
<br />1800 3.81 IB2 2400 3.87 212 0700 5.25 1,080
<br />2000 4.75 635 Sept. 11 0900 5.46 1,290
<br />2100 4.83 710 2400 3.36 B4 0930 5.10 930
<br />2200 4. 70 614 Sept. 12* 1030 5.54 1.370
<br />2230 4.92 7B6 1700 3.40 .0 1300 5.24 1,100
<br />2400 4.87 742 2200 3.49 106 1400 5.44 1,320
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