_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

1
FLOODING SOURCE /00 YR. FLOODPLAIN DATA FLOODW.4Y DATA Z
IDENTIFICATION CROSS STATION-9/ HARGE THALWEG FLOOD F�O�OIN Fl000war wiorH FLOODWAY
EC770 ELEV(ms/. ELEV. (m.S/.J WID L FEET LEFT (FEET) RIGHT (FEET) TOTAL (FEET) ELEV. (m.s.I.J
49220 492+20 4800 5710.8 5720.5 330 60 (60) 34 (34) 94 (94) 5720.6 (5720.6)
49505 495+05 4800 5716.3 5726.3 240 40 (40) 70 (70) 110 (110) 5726.3 (5726.3)
Bridge to Residences 49540 495+40 4800 5717.1 5726.3 260 40 (40) 59 (59) 99 (99) 5726.2 (5726.2)
49890 498+90 4800 5727.2 5734.5 75 25 (25) 47 (47) 72 (72) 5734.5 (5734.5)
50210 502+10 4800 5734.8 5744.9 75 32 (32) 35 (35) 67 (67) 5745.0 (5745.0)
50515 505+15 4800 5745.5 5753.9 80 40 (40) 25 (25) 65 (65) 5754.1 (5754.1)
50860 508+60 4800 5756.9 5767.6 50 18 (18) 32 (32) 50 (50) 5768.1 (5767.5)
51065 510+65 4800 5765.8 5776.7 50 20 (20) 30 (30) 50 (50) 5777.1 (5777.2)
Bridge 51129 511+29 4800 5768.3 5778.1 50 25 (25) 25 (25) 50 (50) 5778.8 (5778.4)
Upstream Study Limit 51260 512+60 4800 5772.2 5781.2 70 28 (28) 42 (42) 70 (70) 5782.3 (5781.9)
DRY CREEK 0. 2 DITCH SPLIT FLOW PROFIL
Downsteam Study Limit 6445 34+80 4030 5210.1 5220.2 2880* 123 (217) 779 (937) 902 (1154) 5221.2 (5220.7)
3800 38+00 4030 5216.3 5220.3 2270* 130 (130) 670 (845) 800 (975) 5221.3 (5220.8)
7170 43+50 4030 5220.4 5224.2 1120* 318 (318) 450 (500) 770 (818) 5224.3 (5224.2)
Downstream Side of 7590 47+30 4030 5225.2 5228.4 1950* 380 (440) 335 (360) 715 (800) 5228.6 (5228.6)
Arapahoe Road 7701 49+50 2430 5225.6 5233.2 '3280* 390 (390) 290 (290)** 680 (680) 5234.2 (5233.7)
5400 54+00 2300 5231.6 5233.4 2260* 250 (350) 190 (290) 440 (640) 5234.3 (5233.9)
6000 60+00 1900 5236.8 5237.9 2270* 260 (260) 205 (260) 465 (520) 5238.2 (5238.1)
6520 65+20 1500 5241.3 5242.2 1950* 183 (300) 120 (250) 303 (550) 5343.0 (5242.7)
7050 70+50 1000 5246.0 5247.0 1320* 100 (100) 150 (180) 250 (280) 5247.4 (5247.2)
7305 73+50 300 5248.2 5249.4 410* 100 (100) 110 (160) 210 (260) 5249.7 (5249.6)
10838 76+60 6630 5252.0 5253.E *** *** *** *** ***
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.
* Floodplain measured for Dry Creek split flow only.
** Arapahoe Road right-of-way to be considered as floodway limit.
***Upstream limit of split flow - see first page of this table for fl oodplain/floodway data.
GREENHORNE and O'MARA, INC. URBAN DRAINAGE AND FLOOD CONTROL DISTRICT 100-YEAR FLOODPLAIN AND FLOODWAY
Engineers • Architects • Planners • Surveyors • Pholograrnmelrish BOULDER COUNTY REFERENCE DATA TABLE DIPS SouthbOs 9odw Ceaad•Sule W �n e•Dwr,CalaMe e0232•(303)TSe-eiSO SOUTH BOULDER CREEK
21