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<br />rlilNIlYRIVERBASIN
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<br />OIl(l~,7300 Wh'ite Rock Creek at White Rod Lake, Dallas, Tex.
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<br />LOCATlON.--Lat 32"48'31", long 96"43'32", Da1las County, on right hank 500 ft upstream from right end of 'white Rock L.ake spillway,
<br />1.500 ft upstream from bridge on Garland Road (State Hlghway 78) in Dallas, and 10.3 miles upstream from mouth.
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<br />DRAINAGE ARI:.A.--IOO sq fl'i.
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<br />PERIOD OF RECORll.--OdobeY' 1962 to current y~ar.
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<br />GAGE.--Water~stdgt' recordE'r and flat-crE'stcd concret.e dam. DatUl~ of gage is at mean '.ed level.
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<br />AVERAGE 0ISCHARGE.--9 yeat.s, 70.0 cfs (9.50 inches per year, 50,720 .'!ere-ft per year).
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<br />EXTREMES.--Current year:
<br />Period of record'
<br />Maximum ele..ation
<br />by city of [Jallas.
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<br />REMARK:'l.--Records poor. Discharge is outflow of White Rock lake (capacity, 10,700 acre-ft in 1970 at spillway crest) and includes
<br />water relea5ed from storage by removal of flashboards in dam. Storage began in White Rock lake in 19H1 and hdS been used at
<br />times by city of Dallas as a source of I1lwicipal water supply. Records furnished by city of Oallas show that during year 10
<br />acre-ft was diverted for irrigation. Thirteen recording rain gages are operated in watershed above this station, and one recording
<br />gage is located at station. The Soil Conservation Service made a reservoir-sedimentation survey in October 1970.
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<br />Mdximum di~.charae, 1,690 cfs flug.
<br />Maximum di~charge, 28,300 cfs Sept.
<br />Slnce 1910, that of Sept. 21,1964.
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<br />15 (ele..ation, 459.23 ft); no flow at times.
<br />21,1%4 (elevation, 465.60 ft); no flow at times each year.
<br />Flood of Apr. 20, 1942. reached an elevation of 465.2 ft, frat
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<br />information
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<br /> DISCHARGE, IN CUBIC fEET PER SECOND, WATER VEAR DC TOBER l'HO TO SEPTEMBER 191'1
<br />!-~ Y ('(.T 'HlV Die J^, FEI> "AR APO MAV JUN JUL AUn SEP
<br /> ~, 7 <0 '" , " 0 '.S '.S ,. l.a
<br /> " 16 11 n " 0 3.' 2.1 " 16
<br /> ". 2" 16 0 " 0 2.8 1.' 20 66
<br />, 4' " " C 41 0 1.' .40 " 30
<br />, 41 " U U 33 0 .15 .30 123 IT
<br />4 H " B.0 0 32 0 .50 .20 158 14
<br />I " I' U U 32 0 .40 ." ,. '.S
<br /> 34 14 0 0 32 0 .30 .20 4' ,.,
<br /> 34 n 0 , 30 0 .20 .20 '4 3.'
<br />I,' }O H 0 0 17 0 .20 .20 " 2.1
<br />11 40 19 0 0 " 0 .20 .20 11 2.1
<br />II " " 0 0 Z3 0 .20 .20 14 101
<br />I' " " 0 0 20 0 .20 .20 14 1.1
<br />I'. '" :J? U 0 " 0 .2U .20 611 .7S
<br />I. SA 30 0 c 15 0 .20 .20 703 .'0
<br />" " " 0 0 14 0 .20 .20 94 .20
<br />I' 48 24 0 0 12 0 .20 .20 4' .20
<br />I. 43 " 0 0 10 0 .20 .20 10 .20
<br />l' 39 14 0 0 '.6 0 .20 .20 3.' .20
<br />20 12 16 0 '0 7., 0 .20 .20 2.8 .20
<br />71 3.J 14 0 107 '.8 0 "' .20 1.' .20
<br />" 3.1 14 U 109 6.2 0 94 .20 1.1 .67
<br />n U 15 0 9' 6.0 0 30 .20 .1S "
<br />24 S; 2l 0 83 S.8 0 14 .20 149 61
<br />'" " 18 0 1S '.0 0 '.S .20 531 '"
<br />2b S4 " 0 71 4.0 0 2.1 .20 24S 6b
<br />n 51 19 0 " 0 .94 .>0 .20 bO 2b
<br />" 46 19 0 " 0 2.1 9.S '" 26 IT
<br />" 42 19 0 ------ 0 138 2b 620 14 14
<br />30 39 18 0 0 90 10 232 ,.S 4.'
<br />31 34 0 0 2' " 4.'
<br />TOTAL 1.347.0 663 B4.0 0 137 562.2 0 254.04 327.45 1.251.30 3,186.95 616.42
<br />i"EAIIl 43.-1 n. L 2.11 0 26.3 18.1 0 8.19 10.9 40.6 103 20.5
<br />"'X 80 32 lA 0 109 " 0 136 '" 620 70' 2"
<br />"," ,., 14 n 0 0 0 0 0 .20 .20 .7S .20
<br />CF:,M .43 ." .03 0 . 26 .16 0 .08 .11 .41 1.03 .21
<br />I I~. .SO .25 .03 0 .21 .21 0 .09 .12 .47 1.19 .23
<br />AC-FT .~, 660 1,320 1b7 0 1,460 1.120 0 S04 bSO 2.'t90 6.320 1,220
<br />CAL YR 1970 TOTAL 32,486.15 MEAN B9.0 MAX ;~, 520 MIN 0 CFSM .89 IN 12.08 AC~FT 64-.440
<br />WI" V" 1971 TOTAL 9.030.36 MEAN 24.7 MAX 10' MIN 0 CFSH .ZS IN 3.36 AC-FT 17,910
<br />NOTE.--Stage-dischargl! relation indefinite at times throughout the year due to seepage and il"ltentlHtent removal and installation
<br />offlashboards 1n dam.
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<br />-18-
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