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I, I I I I I I I, Ii I) I I I I I I I I I FLOODING SOURCE 100 YR FLOODPLAIN DATA FLOODW4Y DATA 2 CROSS STATIONl D~ ~ZXfl. THALWEG FLOOD FLOOD- FLOODWAY WIDTH FLOODWAY IDENTIFICATION SECTlO^ ~1~1GE ELEI/.(m,s,l., ELEV. (mos./.) PLAIN LEFT (FEET) RIGHT (FEET) TOTAL (FEET) ELEI/. fm.s./.) , WIDT'HfFEETl South Boulder Road 19795 197+95 6160 5330.2 5336.0 1860 47 (47) 851 (951) 898 (998) 5335.6 (5335.6) (Downstream Limit 20180 201+80 6160 5334.0 5338.4 1950 205 (205 ) 475 (475) 680 (680) 5338.7 (5338.6) S.H. 93 Split Flow) 20910 209+10 4500# 5340.8 5345.6 1060 387 (425 ) l05 (155 ) 492 (580) 5346.3 (5345.8) 21755 217+55 4500# 5350.4 5353.8 1340 160 (160) 50 (90) 210 (250) 5353.9 (5353.8) 21855 2l8+55 4500# 5348.9 5356.3 1300* 60 (60) 80 (80) 140 (140) 5356.3 (5356.3) U.S. Hi9hway 36 22035 220+35 4500# 5351. 8 5361. 5 450** 100 (100) 66 (66) 166 (166) 5361.5 (5361.5 ) ( Denver- 22505 225+05 4500# 5355.l 5362.5 500** 69 (127 ) 49 (49) 118 (176) 5362.9 (5362.8) Boulder Turnpike) 23103 231 +03 4160# 5362.5 5367.8 540** l55 (l55 ) 28 (28) l83 (183) 5367.8 (5367.7) 23735 237+35 4160# 5368.2 5374.7 5l0- 233 (305 ) 24 (24 ) 257 (329) 5375.7 (5375.2) 24270 242+70 3l60# 5374.3 5379.1 530- 243 (279) 29 (29) 272 (308) 5380.0 (5379.5 ) 24870 248+70 2200# 5382.8 5386.8 370_ 40 (40) 30 (30) 70 (70) 5387.2 (5387.2) 24930 249+ 30 2200# 5386.0 5389.2 290_ 40 (40) 35 (35 ) 75 (75) 5389.2 (5389.2) 25585 255+85 2100# 5390.8 5395.6 120- 40 (40) 53 (71) 93 (111 ) 5395.6 (5395.6) 26330 263+30 2100# 5398.2 5403.3 530- 91 (140) l75 (282) 266 (422 ) 5403.8 (5303.4) 27140 271+40 2l00# 5403.0 5410.5 645- 93 (143) l07 (207) 200 (350) 5410.8 (5310.7) 27630 276+30 2100# 5411.7 5416.6 1350h 45 (130) 12 (24 ) 57 (154) 5417.4 (5316.9) 28215 282+l5 2l00# 5417.0 5421.3 1132h 78 (88) 20 (20) 98 (108) 5422.1 (5321.5) 28795 287+95 2100# 5419.9 5429.8 715h 10 (lO) 110 (159 ) 120 (169 ) 5430.5 (5429.8) 29390 293+90 2100# 5429.9 5435.1 310 69 (l02) l06 (156) 175 (258) 5435.4 (5435.1) 30280 302+80 2100# 5438.0 5443.1 1380- 190 (290) 160 (260) 350 (550) 5444.1 (5443.6) 30930 309+30 2l00# 5446.8 5451.l 1570*- 220 (360) 80 (80) 300 (440) 5451. 2 (5450.9 ) 31095 310+95 2100# 5449.0 5453.5 1545*- 110 (l60) 110 (110) 220 (270) 5453.8 (5453.7) Ma rsha 11 RDad 31210 312+10 2100# 5450.5 5456.5 1380*- 85 (135 ) 110 (110) 195 (245 ) 5456.7 (5456.7) 31650 316+50 2100# 5454.7 5458.7 220 80 (80) 65 (65) 145 (145) 5459.4 (5459.1) State Highway 93 31850 318+50 2100# 5459.2 5463.6 588** 28 (29) 54 (55 ) 82 (84) 5463.6 (5463.6) (S. Broadway) 5467.4 (5467.l) 32210 322+10 2l00# 5461.4 5466.7 950** 56 (167) 33 (33) 89 (200) 32475 324+75 4440# 5463.2 5469.0 505*- , 78 (l83) 59 (103 ) 137 (286) 5469.4 (5469,6) (Upstream Limit 32980 329+80 5740 5469.3 5475.9 780 301 (347) 11 (34 ) 312 (381) 5476.8 (5476.0) S.H. 93 Split Flow) 33390 333+90 5740 5475.5 5480.6 8l5* 200 (550) 103 (103) 303 (653 ) 5480.7 (5480.9) 33810 338+10 5740 5478.8 5484.9 970* 132 (352) 223 (223) 355 (575 ) 5485.9 (5485.2) I I 1 Stationing from mouth (feet). 2 Floodway data in parenthesis () represent floodway based on 0.5 ft rise in Energy Grade Line (EGL)- all other floodway data pertains to encroachment for 1 foot rise in EGL- widths relative to channel centerline looking downstream. * Width includes island area(s) and/or other high ground between outer floodplain boundaries. ** Distance measured to split flow boundary. - Floodplain width for main channel flow only. Width includes any shallow flooding area between split floodplains. # Discharge relates to main channel portion of split flow - see separate floodplain/floodway reference data for S.H. 93 split flow. GREEN HORNE and O'MARA, INC. Engineers . Architects . Planners . SurveyorS . Photogrammetrists 1325 South Cokwado BoIIIevGn:I-Suit. 405' D.n.,.r, Colorado B0222- (303) 7158-5250 URBAN DRAINAGE AND FLOOD CONTROL DISTRICT BOULDER COUNTY IOO-YEAR FLOODPLAIN AND FLOODWAY REFERENCE DATA SOUTH BOULDER CREEK TABLE 4 (Cont.) 19