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Appendix B 111 BASE FLOOD FLOODING SOURCE FLOODWAY WATER SURFACE ELEVATION REGULATORY WITHOUT FLOODWAY WITH FLOODWAY INCREASE CROSS SECTION DISTANCE WIDTH (FEET) SECTION AREA (SQUARE FEET) MEAN VELOCITY (FEET PER SECOND) FEET (NAVD 88) Cottonwood Branch at Denton A 3,8501 356 1,780 4.1 463.7 463.7 464.5 0.8 B 6,7101 587 2,554 2.9 470.1 470.1 471.1 1.0 C 11.3351 270 2,156 3.1 487.4 487.4 488.1 0.7 D 14,7051 123 1,411 4.0 495.1 495.1 495.8 0.7 E 22,5101 313 1,650 2.5 523.6 523.6 524.6 1.0 Cottonwood Creek of Grand Prairie A 5,1502 1,153 3,319 6.9 464.7 464.7 464.7 0.0 B 7,5402 710 7,517 3.0 469.7 469.7 469.9 0.2 C 8,8802 797 7,216 3.2 470.8 470.8 471.0 0.2 D 9,5002 812 7,549 2.8 471.9 471.9 472.1 0.2 E 10,1402 904 9,484 2.2 472.4 472.4 472.6 0.2 F 11,0202 819 7,047 3.0 473.2 473.2 473.4 0.2 G 13,0302 663 4,675 4.5 478.1 478.1 478.4 0.3 H 14,4242 1,153 4,785 4.3 482.2 482.2 482.3 0.1 I 15,6402 497 3,252 6.3 483.3 483.3 483.4 0.1 J 17,1602 539 4,304 3.1 485.9 485.9 486.2 0.3 K 18,7002 475 4,154 3.1 492.9 492.9 492.9 0.0 L 21,2402 641 3,253 3.9 496.2 496.2 496.4 0.2 M 22,0702 356 2,644 4.8 499.4 499.4 499.7 0.3 N 23,2502 342 2,317 5.5 503.7 503.7 504.0 0.3 O 24,3302 438 2,942 4.4 508.1 508.1 508.4 0.3 1Feet above confluence with Denton Creek 2Feet above confluence with Mountain Creek Lake FEDERAL EMERGENCY MANAGEMENT AGENCY DALLAS COUNTY, TX FLOODWAY DATA AND INCORPORATED AREAS TABLE 6 COTTONWOOD BRANCH AT DENTON – COTTONWOOD CREEK OF GRAND PRAIRIE