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24 FLOODS OF SEPT. 1970 IN ARIZ., UTAH, COLO., AND N. MEX. STATION DATA-GILA RIVER BASIN 125 Day Sept. 4 5 6 Mean discharge, in cubic feet per second. 1970 Discharge Day Disc::harge Day 0.8 Sept. 7 350 Sept. 9 8.500 8 90 10 1,700 (130) 09513650. Agua Fria River at El Mirage, Ariz. (Crest-stage station) Locatio.n. --Lat 33036'2411, long 112018'14". in NW-lNwt sec. 18, T.3 N.. :R.l E.. Marll::opa County, at Grand Avenue O. 75 Ini 0,2 km) southeast of El Mirage. Drainage area. -.~ I, ~37 mi2 (4,240 Jan2), of whkh 1.459 mi2 (3,779 km2) is above Lake Pleasant, WhICh IS noncontributing except during periods of spill from Waddell Dam. Gage-hei~ht record. -.Crest stages only. Datum of gage is 1,113.00 it (339.242 m) above mean sea level (levels by Arizona Highway Department). Discharlle record. --Stage-discharge relation defined by current-meter measurements below 1,540 ft";S/s (43. 6 m3/s) and extended' above by logarithmic plotting. Maxima. --Sept. 4-10, 1970: Discharge, 5,000 ft3/s (142 m3/a) Sept. 5 (gage height, 4.60 ft or 1.402 m). .1963 to August 1970: Discharge, 2,520 ft3/s (71. 4 m3/a) Dec. 19, 1967 (gage heIght, 4,05 ft or 1. 234 m). (128) 09512800. Agua Fria River near Rock Springs, Ariz. Location.--Lat 34"00150", long 112"10'15", inNW: sec. 28, T.8 N., R.2 E., Maricopa County, on left bank 10 mi (16 kIn) upstream from Lake Pleasant, 45 mt (72 Ian) north of Phoenix, amI 2.5 mi (4. 0 kIn) Elouthwest of Rock Springs. Drainap;e area. --I, 130 mi2 (2,930 km2). approximately. Galle-height record. --Water-stage recorder graph except after 1830 hours Sept. 5, when the gage was destroyed. Discharge record. --Discharge estimated on basis of current-meter measurements, slope- area measurement of peak flow, and comparison with upstream station. Maximum. --Sept. 4-10, 1970: Discharge, 40,100 ft3/e (1, 140 m3/s) about 1900 hours Sept. 5 (gage height, 20.62 ft (6.285), from profile past gage). Remarks. --Gage was installed January 1970. Discharge 50 20 (131) 09513780. New River near Rock Springs, Ariz. Location. --Lat 33"58127", long 112"05154", in SW.!SW.1. sec 6 T 7 N R 3 EM. Ct. h b t. .. ',' ., . . , arlcopa oun y, .on ng t ank.180 ft (55 m) upstream from road crossing and 6 mi (10 km) southeast of Rock Sprmgs. Drainage area. --67. 3 mi2 (174. 3 km2). Gage-height record. --Water-stage recorder graph except Sept. 6, 8-10. Gage-height :ecord reconstructed from normal recession and adjoining record. Altitude of gage 1S 2,310 ft (704 m), from topographic map. (129) 09513500. Lake Pleasant at Waddell Dam, Ariz. Location:hLat 33"51'2011, long 112"15'58'\ in SWt sec.16, T. 6 N., R.l E" Maricopa County, at left upstream end of Waddell Dam on Agua Fria River. DrainaA"e area. --1. 459 mi2 (3,779 1o'n2). Gage-height record. -~Nonrecording gage read once daily. Datum of gage is 1,432.2 ft (435. 53 m) above mean sea level. DischarRe record. --Stage-discharge relation defined by current-meter measurements. below 380 .ft3/s (11 m3/s) and extended above on basis of slope-area measurements at gage heIghts 3.5, 4,73, 7.3, 10.7, and 13.5 ft (1. 10 1 442 2 23 3 26 and 4.11m). ,. ,. . . , Maxima. --Sept. I-IS, 1970: Contents, 80,100 acre-ft (98.8 hm3) sept. 10 (gage height, 143.04 ft or 43.599 m). 1928 to August 1970: Contents, 178,500 acre-ft (220 hm3) Apr. 19, 1941. Remarks. --Lake is formed by concrete multiple-arch dam; dam completed and storage began in 1927. Capacity. 157,600 acre-ft (194 hm3), of which 86,870 acre-ft (107 hm3) is at gage height 146,0 ft or 44. 50 m (crest of spillway) and 70,730 acre-ft (87.2 hm3) between gage height13 146.0 ft or 44.50 m and 170.0 ft or 51. 82 m (top of spillway gates). Figures given herein represent usable contents in Lake Pleasant (based on 1965 capacity table). Contents of small reservoir formed by diversion dam is not included, ~. ~-~ept. 4-10, 1970: DiScharge, 18,600 ft3/s (527 m3/g) 1600 hours Sept. 5 (gage heIght, 13.5 ft ar 4. 11 m, from profile j'ast gage). .1962 to August 1970: Discharge, 10,600 it Is (300 m3/s) Dec. 19, 1967 (gage heIght, B: 3 It or 2. 53 m, in gage weI1; 10.7 ft or 3.26 m, from profile ast e), from ratmg curve extended above 380 ft3/s (11 m3/s) on basis of slope-P gag measurement of peak flow. area Cooperation. --Gage-height record furnished by Maricopa County Municipal Water Conser-vation District No.1. Day Sept. 4 5 6 Mean discharge, in cubic feet per second, 1970 Discharge Day Discharge Day O. 10 Sept. 7 48 Sept. 9 2,750 8 16 10 262 Discharge 9.7 5.2 Contents, in acre-feet, at 1700 hours on indicated day, 1970 Day Contents I Day Contents Day' Contents Sept. , 56,980 Sept. 6 78,720 Sept. 1l 80,080 2 56,620 7 79,700 12 80,050 3 56,240 8 79,960 13 80,030 4 56,050 9 80,050 ,4 80,010 5 59,780 10 80,100 ,5 79,940 Gage height, in feet, and discharge, in cubic feet per second at indicated t'me 1970 , Hour Gage Discharge Hour Gage Discharge Gage height Hour Discharge height height Sept. 4 Sept. 5* Con. Sept, 5 *- Con, 2400 0.82 0 1030 3.70 800 1600 13.5 18,aOO Sept. 5* 1200 5.69 2,370 1700 9. 16 7,700 0530 .82 0 1300 5.91 2,730 1830 0600 1.12 6 1330 8.41 6,500 6.41 3,410 2000 6.46 3,480 0700 I. 03 5 1400 5.86 2,670 2200 0730 3.00 450 1500 5.20 1.940 8.28 6,290 2400 4.05 1,020 *Da ily mean computed from data in addItIon to fIgures shown.