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<br />TRINITY RIVER BASIN
<br />
<br />OB055700 Bachman Branch at Dallas, Tex.
<br />
<br />LOCATION.--lat 32051'39", long 96049'53", Dallas County, on left bank at end of Bluffview Boulevard 'in Dallas. 1,300 ft downstream
<br />from bridge on Northwest Highway, 1.9 miles upstream from Bachman Lij,ke Dam, and 6.0 miles northwest of Dallas City Hall. Prior
<br />to May 1. 1970, at bridge on Midway Road, 2.300 ft downstream.
<br />
<br />DRAINAGE AREA.--9.58 sq mi. Area at site used prior to May 1. 1970, 10.0 sq mi.
<br />
<br />PERIOD OF RECORD.--October 1963 to current year. Records since May 1, 1970, are equivalent to earlier records.
<br />
<br />GAGE.--Water-stage recorder. Datum of gage is at mean sea level. PriQr to May 1, 1970, at site 2,300 ft downstream at same datum.
<br />
<br />AVERAGE DISCHARGE.--B years, 9.14 cfs (12.96 inches per year, 6,620 aCre-ft per year).
<br />
<br />EXTREMES.--Current year: Maximum discharge. 3,4BO cfs Aug. 14 (elevation. 466.57 ft, from floodmtlrks). from rtlting curve extended
<br />above 1,330 cfs; minimum. 0.02 cfs Sept. 18.
<br />Period of record: !ltaximum discharge, 16,000 cfs Apr. 2B. 1966 (elevation, 467.97 ft, fanner site), from rating curve extended
<br />above 4,000 cfs on basis af contracted-opening measurements of 5.300, 9,200, and 16,000 cfs; no flow at times most years.
<br />Maximum stage since at least 1900, that of Apr. 28. 1966. Flood of Oct. 8, 1962. the second highest flood since 1900. reached
<br />an elevation of 465.6 ft (discharge, 9,200 cfs) at fanner site.
<br />
<br />REMARKS.--Records fair. Flow slightly regulated by several small channel dams above station. Two recording rain gages are operated
<br />in the basin above station.
<br /> DISCHARGE. IN CUBIC FEET PE' SECOND, WATEIl. YEAR OCTOBER 1970 TO SEPTEMBER 1971
<br />'" l1l..T 'Hili [lEe J" fEll M,. '" MAY JON JuL AU" SE'
<br />I 1.-' .>'.7 1.1 1.1 ." 2.' 1.1 1.' 1.1 ..J J.5 1.1
<br />, \.j .Jl 1.0 1.1 .., 5.' 1.2 1.2 .8B .50 2.J T.7
<br />, I.. . ~ 1 1.1 J.l ." '.2 1.2 I.' .58 ... 1.1 -2..
<br />. 1.1 . ~: 1 I.' I.' '.1 2.' I.' t.1 .58 .4J ., 1.1
<br />'. 1.6 .1t> I.e 1.2 I.' 2.2 1.' 1.2 .54 .4J 15 .n
<br />, '.J .07 ." 1.1 1.1 2", I.' 1.2 ... .37 1.3 .58
<br />I l.t I.() .9-1 I.J 1.1 2.0 t.J 1.2 .4b .2. 1.& ...
<br /> I" .i:1 1.1 1.::1 1.1 2,( I.' 1.0 .50 .lD 1.3 .70
<br />, 1.2 I . .~) 1.1 1.:'1 1.0 2.0 1.3 1.1 .., .23 .94 ...
<br />LC 1.0 I.i.. 1.1 1.2 1.0 2.0 1.1 I.. ... .23 .7} .37
<br />II n 1.1 1.1 1.1 1.1 2.2 1.2 2.5 .sa .19 .58 .37
<br />" 11 .-\7 1.2 1.0 I.. I., I.' ... .54 .17 .54 .31
<br />LJ -~. .. ," .0 t.l I.. 1.2 I.' 1.6 .54 .50 .17 1.1 .34
<br />1'. '., (..<.o .91 1.1 l. _~ 2.0 I.' .13 .54 .14 307 .l9
<br />15 l.r. I.' ':>.2 .9. I.' I.. 1.4 ... .58 .12 5.5 .11
<br />to I.. 1.1 ~.o .94 1.4 I.. 11 ..B .54 .12 4.0 .04
<br />17 I.. 1.1 1.0 .94 1.4 1.5 ,. ..J .54 .12 2.1 .07
<br />If> I.' 1.') 1.0 .94 " I.. 40 .54 .')4 .12 1.5 .14
<br />19 I.J .'J) 1.1 . !'IS 3.7 1.2 4.5 .58 .50 3.3 I.J .23
<br />2e 1.[ .,;l 1.1 .9' 2.1 1.2 lJ .54 .43 t.7 1.2 .19
<br />21 1.' I' IJ.6 l.t T. 1.2 4." .58 78 .19 1.2 .lD
<br />2' 1.[ 1.1 2.t 1.2 ..0 1.2 3.3 .54 1.7 .19 I.t 22
<br />" .n I.' 1.1 1.1 3.' 1.2 2.9 ..6 1.0 2.0 1.1 9.'
<br />2' .., t.' 1.0 1.1 2.9 1.2 2.2 ..J .., 23 T.5 ...
<br />J5 '.1 1.5 .93 1.1 17 1.3 2.1 .6B ..B .94 II '.2
<br />26 l.4 1.1 1.1 1.0 ..' I.. 2.0 ... .58 .54 2.J 1.4
<br />27 ('..) I.' 1.0 .", 2.6 1.5 I.' 159 .54 IS I.' .94
<br />1f1 1.(, 1. ~ 1.0 .fJe 2.A 1.4 1.' I.J 12 lIS 1.5 ..J
<br />29 I.. 1.4 1.0 .94 1.5 2.9 42 1.4 51 1.2 .54
<br />30 1.[ 1.4 " ." t.2 I.T 2.J 1.1 e.. 1.2 .78
<br />31 l.? I.. .94 1.2 I.J 4.J 1.1
<br />TfHAL ?'16.~ 44.65 71.92 Vj.1l6 169.6<;1 58.S 16<;1.6 230.2<;1 10<;1.58 436.11 471.59 71).46
<br />r--.f'A\l 7.1:>4 1....4 2.3fl 1.16 6.06 1.8<;1 5.65 7.43 3.6S 14.1 15.4 2.35
<br />"'AX 91 ~. 0 '" '.1 T. 5.& 5. 159 7. JIS J07 22
<br />'HN 1.0 .n .9) .US .Jl3 1.? 1.1 .54 .43 .12 .54 .04
<br />CFS'" .!lO .1' .2') . \2 .., .20 .59 .78 ... 1.47 1.61 ,"
<br />". .')2 .17 .29 .14 . " ." ... ." .43 1.70 1.&5 .27
<br />,\C-fT 470 ,9 147 71 3" II. Jl. 457 217 ,.. 947 140
<br />Ctt) 3.00 .3. .9. .1. 2.26 .34 2.46 3.48 1.82 5.60 5.01 2.36
<br />eAL y. 1970 TOTAL 3.758.77 MEAN 10.3 MAX 354 MtN 0 ::'F$,'-1 1.06 IN 14.60 AC-FT 7,460 tt 36.26
<br />WT' y. 1971 TOTAL 2.113.75 MEAN 5.79 MAX 3" MIN .04 CFSM .00 IN 8.21 AC-fT 4,190 tt 27.61
<br /> PEAK DISCHARGE (BASE, 1,000 CFS) tt Wei ghted-mean ra i nfa 11 . in inches, based on
<br /> tHO rain gages.
<br />DATE TIME ELEV. DISCHARGE DATE TIME ELEV. DISCHARGE
<br />10-23 1100 464.07 1,450 6-21 1100 463.73 1,380
<br />2-21 0900 463.20 1.060 7-28 1300 466.26 3,230
<br />5-27 0430 464.83 2,110 ,-. 1630 464.57 1,930
<br /> 8-14 1400 a466.57 3,480
<br />a From floodmark.
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<br />-14-
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