_REVISION - M1981302 ‎(117)‎

• Permit No: M1981302
• IBM Index Class Name: Revision
• Doc Name: FLOOD HAZARD AREA DELINEATION SOUTH BOULDER CREEK JULY 1986
• Type & Sequence: AM2
• Media Type: D
• Archive: No

FLOODING SOURCE /00 YR. FLOODPLA/N DATA FLOODW4Y DATA 2
THALWEG FLOOD FLOOD- FLOODWAY WIDTH FLOOOWAY
IDENTIFICATION ES STAT/ON1 D/ HARGE ELEV. (ms./. ELEV. (m.s/.J WroTHAFN T LEFT (FEET) RIGHT (FEET) TOTAL (FEET) ELEV. (m.s./.l
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 45000 5340.8 5345.6 1060 387 (425) 105 (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 218+55 45000 5348.9 5356.3 1300* 60 (60) 80 (80) 140 (140) 5356.3 (5356.3)
U.S. Highway 36 22035 220+35 4500# 5351.8 5361.5 450** 100 (100) 66 (66) 166 (166) 5361.5 (5361.5)
(Denver- 22505 225+05 45000 5355.1 5362.5 500** 69 (127) 49 (49) 118 (176) 5362.9 (5362.8)
Boulder Turnpike) 23103 231+03 4160# 5362.5 5367.8 540** 155 (155) 28 (28) 183 (183) 5367.8 (5367.7)
23735 237+35 4160# 5368.2 5374.7 510• 233 (305) 24 (24) 257 (329) 5375.7 (5375.2)
24270 242+70 31604 5374.3 5379.1 5300 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 22000 5386.0 5389.2 2909 40 (40) 35 (35) 75 (75) 5389.2 (5389.2)
25585 255+85 2100# 5390.8 5395.6 1200 40 (40) 53 (71) 93 (111) 5395.6 (5395.6)
26330 263+30 2100# 5398.2 5403.3 5306 91 (140) 175 (282) 266 (422) 5403.8 (5303.4)
27140 271+40 2100# 5403.0 5410.5 6450 93 (143) 107 (207) 200 (350) 5410.8 (5310.7)
27630 276+30 21000 5411.7 5416.6 13500* 45 (130) 12 (24) 57 (154) 5417.4 (5316.9)
28215 282+15 21000 5417.0 5421.3 11320* 78 (88) 20 (20) 98 (108) 5422.1 (5321.5)
28795 287+95 2100# 5419.9 5429.8 7150* 10 (10) 110 (159) 120 (169) 5430.5 (5429.8)
29390 293+90 2100# 5429.9 5435.1 310 69 (102) 106 (156) 175 (258) 5435.4 (5435.1)
30280 302+80 2100# 5438.0 5443.1 13800 190 (290) 160 (260) 350 (550) 5444.1 (5443.6)
30930 309+30 2100# 5446.8 5451.1 1570*0 220 (360) 80 (80) 300 (440) 5451.2 (5450.9)
31095 310+95 2100# 5449.0 5453.5 1545*0 110 (160) 110 (110) 220 (270) 5453.8 (5453.7)
Marshall Road 31210 312+10 2100# 5450.5 5456.5 1380*0 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) 32210 322+10 21000 5461.4 5466.7 950** 56 (167) 33 (33) 89 (200) 5467.4 (5467.1)
32475 324+75 44400 5463.2 5469.0 505*0 . 78 (183) 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 5480.6 815* 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)
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.
GREENHORNE and OrMARA, INC. URBAN DRAINAGE AND FLOOD CONTROL DISTRICT 100-YEAR FLOODPLAIN AND FLOODWAY TABLE
Engineers • Architects • Plonners • surveyors • Phdogrommehists BOULDER COUNTY REFERENCE DATA 4
pug Cbr,& ea....e.sft ,oe.0mm,Cal I eezu-(303)758-Mo SOUTH BOULDER CREEK (Conta