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<br /> TABLE 1 - SUMMARY OF DISCHARGES - continued <br /> FLOODING SOURCE DRAINAGE AREA PEAK DISCHARGES (cfs) <br /> AND LOCATION (sq. miles) 10-YEAR SO-YEAR laO-YEAR 500-YEAR <br /> - <br /> BLANCO RIVER <br /> (continued) <br /> Upstream of Diversion <br /> 3, approximately 2,300 <br /> feet downstream of <br /> Interstate Route 35/ <br /> U. S. Route 81 429.21 48,170 122,850 154,630 213,740 <br /> BYPASS CREEK <br /> Above confluence with <br /> San Marcos River 7.17 4,498 13,123 28,445 62,079 <br /> Below confluence with <br /> Blanco River <br /> Diversion 1 (below <br /> Missouri-Kansas- <br /> Texas Railroad) 5.69 4,263 13 , 388 28,493 62,115 <br /> Below confluence with <br /> Blanco River <br /> Diversion 2 5.69 4,263 13,388 28,481 61,066 <br /> Above Missouri- <br /> Kansas-Texas <br /> Railroad 5.6Q 4,263 7,502 13,247 29,846 <br /> Below State Route 21 <br /> (below confluence <br /> with Bypass Creek <br /> Tributary 1) 4.19 3,687 6,419 13,257 30,114 <br /> Above State Route 21 <br /> (above confluence <br /> with Bypass Creek <br /> Tributary 1) 2.71 2,642 6,287 13,161 29,991 <br /> Below confluence of <br /> Blanco River <br /> Diversion 3 1.08 1,390 6,321 13,149 29,994 <br /> 3.2 Hydraulic Analyses <br /> Analyses of the hydraulic characteristics of flooding from the <br /> sources studied were carried out to provide estimates of the <br /> elevations of floods of the selected recurrence intervals. <br /> Cross sections for the backwater analyses were field surveyed or <br /> digitized from aerial photographs. Cross sections were located at <br /> close intervals above and below bridges and culverts in order to <br /> compute the significant backwater effects of these structures. <br /> Bridge data were obtained by field measurements and from bridge <br /> plans of the Texas Department of Highways and Public Transportation. <br /> 9 <br />