FLOOD04416

• Designation Number: 304
• County: Adams
• Community: Unincorporated Adams County
• Stream Name: Big Dry Creek, (ADCO), North area tributaries
• Basin: South Platte
• Title: Flood Hazard Area Delineation - Big Dry Creek, ADCO, North Area Tributaries
• Date: 7/1/1989
• Designation Date: 1/1/1990
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TABLE IV-1
FLOOD HAZARD DATA FOR 100-YEAR STORM (CONT...)

3IIlf IUI
Fl ood1 ng SalI"Ce l()()..;ear Fl"",*>lain Data FlllOlW;jy Data
Fl~ lItdth 3
lOD-year Tha1""9 Flood Fl"",*>l.in Velocl~2 FlllOlW;jy
IdentificatiO'l StatiO'll Di sellal'1lE! Elevation Elevation Left Rig,t Total 191.4 Elevation
(cfs) (MSl) (MSI..) lItdth (ft) (fps) (feet) (feet) (feet) 1fE!l (MSI..)
5+m 1310 !ll76.5 In Bi9 Dry Creek Fl"",*>lain In Bi9 Dry Creek FlllOlW;jy
11+10 1310 5IJll.7 In Big Illy Creek Floodplafn In Bi9 Illy Creek Floa<Wi!y
156111 Avewe 11+m 1310 !ll85.5 In Bi9 Dry Creek Fl"",*>lain In Big ~. Creek Floa<Wi!y
17+40 1310 !ll85.5 5007.4 IlOO 2.4 55 155 210 2.7 5IJl7.7
19+60 1310 5IJl6.8 5IJl9.6 140 7.5 55 25 8J 8.2 5IJl9.7
24+15 1310 !ll92.0 5096.1 160 5.5 !iJ 40 90 5.6 5096.3
30+40 1310 5100.2 5103.5 8J 8.5 30 30 m 9.2 5103.5
36+40 1310 5113.9 5115.7 1!ll 7.6 55 20 75 7.6 5116.0
LPI'Il 37+8) 1170 5117.0 5133.1 950 0.2 8D 60 140 1.8 5133.1
38+m 1170 5117.5 5133.1 850 0.3 100 8J 18J 1.0 5133.1
Dim 41+!ll 1170 5133.7 5134.2 am 4.5 l!ll 130 28J 5.0 5134.4
49+10 1030 5131.2 5135.7 240 1.9 55 45 100 2.1 5136.1
55+70 1030 5142.5 5144.4 2!ll* 5.7 70 100 170 5.7 5144.4
COlo. Blvd. 56+15 860 5143.0 5148.8 340 1.4 130 200 330 1.4 5148.8
56+70 860 5144.0 5148.B 170 4.5 100 60 1m 4.5 5148.8
59+!ll 860 5147.2 51!iJ.8 95 4.0 50 10 60 4.8 5151.0
62+!ll 860 5151.3 5153.6 11:6 7.2 30 20 !ll 8.4 5153.6
68+25 860 5161.4 5164.0 110 6.3 40 30 70 6.3 5164.4
75+70 860 5170.0 5181.4 28J 6.0 30 !ll 8J 7.0 5181.6

EII6 IUI
Flooding SalI"Ce l()()..;ear Fl"",*>lafn Data Floa<Wi!y Data
Fl~lItdth 3
lOD-year Thal""9 Flood Velociti Fl~
I<lentiffcatiO'l Stationl Oischal'1lE! Elevation Elevation Fl"",*>lain Left Rlg,t Total 191.4 Elevation
(cfs) (MSl..l (MSl) Width (ft) (fps) (feet) (feet) (feet) 1fE!l (MSl)
3+40 610 !iJ6B.3 In Big ()y Creek Fl"",*>lain In Bi g Illy Creek FlllOlW;jy.
9+30 610 5075.5 In Bi9 ()y Creek Floodplain In B19 Illy Creek Floodo8y
14+45 610 5091.5 !ll92.4 210 4.6 10 90 100 5.9 !ll92.7
IJiJn 17+00 610 5109.0 5109.5 410 3.B 20 140 160 5.1 5109.8
21+40 610 511:6.3 511Q.6 300 1.3 100 100 200 1.2 5111.0
UPPR 21+95 m 5107.5 5120.0 520 0.7 90 120 210 0.7 5120.0
22+30 m 5109.0 5120.0 ~ 0.1 90 120 210 0.2 5120.0
23+80 38D 5110.9 5120.0 720 0.2 70 100 170 0.3 5120.0
25<65 m 5116.0 5120.0 340 0.5 60 8J 140 0.8 5120.0
28+00 380 5121.0 5122.4 120 5.2 20 30 !ll 6.3 5122.5
29+-20 38J 5125.0 5126.4 240 3.9 !ll 110 1m 3.9 5126.4
COlorado B1 yd. 29+-75 240 5125.6 5130.6 370 1.6 90 2&:l 3!ll 1.6 5130.6
30+20 240 5126.5 5130.6 110 2.4 55 55 110 2.4 5130.6
32+1:6 240 5132.0 5133.5 60 5.1 25 25 !ll 5.4 5133.5
34+8) 240 5141.2 5141.8 1!ll 3.8 30 40 70 4.9 5142.0
40+20 240 5152.0 5152.4 220 3.2 65 15 8J 3.9 5152.8

~tes:

1. Distance fran confluence along ehannel reference 11...
2. Mean veloci~ In chamel.
3. Fran ehamel reference 11.. looking cbmstretm.
4. Mean veloci~ In floa<Wi!y.

~tes:

1. Distance fran coofluence along chamel reference li...
2. Mean veloci~ in chamel.
3. Fran ehamel reference 11.. looking _Stre<ln.
4. Mean veloclt;y in flOO<klY.

Fl"",*>lain width includes area of hydrau11cally disco..~ted flow.
Floodplain width <iles not include area of hycrou11cally disco..""t."d flo<.

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Fl"",*>lain width includes area of hYdraulically diseOhleCted flow.
Fl"",*>lain width <ties not Include area of hYcroullcally diseoonected flow.