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...)

IIISIJIG IUl IIRlH
Fl oodi ng SalI"Ce llJO-:year Fl"",*>lain Data FlOOlloii\Y Data
FlooOolY lItdth 3
llJO-:year Thal""9 Flood velociti Fl~
ldentificatioo StatiO'll Dischal'1lE! Elevation Elevatioo Fl"",*>lain Left Rig,t Total 191.4 EleYation
(efs) (MSl) (MSl) lItdth (ft) (fps) (feet) (feet) (feet) 1fE!l (MSl)
folJstang ~n 0+00 !llD 5193.8 5199.8 1140 0.7 130 230 360 1.1 5199.8
Conflueoce 51-20 !llD 5199.5 5202.6 85 6.6 IS 15 30 8.2 5202.7
10+90 !llD 5209.0 5212.0 100 3.8 20 20 40 4.9 5212.4
16+00 !llD 5218.0 5219.0 28J 3.3 40 50 90 5.0 5219.3
20tal 360 5226.0 5226.2 370 3.7 8J 240 320 3.2 5226.3
ftJron St. 21+10 3!ll 5229.0 5229.7 410 1.3 90 310 400 1.3 5229.7
21+45 360 5228.0 5229.7 710 0.2 90 310 400 0.5 5229.7
26+8J 360 5237.0 5238.4 120 4.8 20 20 40 6.6 5238.6
33+00 360 52!ll.0 5251.1 200 4.3 30 30 60 5.8 5251.3

~am:
Flood1ng Soorce l00..~r Fl"",*>lain Data FlOOlloii\Y Dota
FlOOlloii\Y Width 3
l00-)9r Thal""9 Flood veloci1;i FlOOlloii\Y
ldentiffcatioo StatiO'll 01 sellal'1lE! Elevation Elevation Floodplain Left Rlg,t Total 191.4 Elevation
(efs) (MSl) (MSl) lItdth (ft) (fps) (feet) (feet) (feet) 1fE!l (MSl)
3+25 2320 5094.5 !ll96.1 ~ 3.6 29D 310 600 5.5 !ll96.6
8+45 2320 5101.7 5102.5 1220 2.3 375 255 630 3.4 5103.0
14-100 2320 5100.0 5100.1 710 5.7 170 40 210 7.1 5100.4
19+05 2320 5111.0 5114.2 390 3.9 120 70 190 4.9 5114.5
24+1:6 21!ll 5127.8 5128.5 lloo 2.5 170 320 490 5.1 5128.6
Sack Creek 30+40 21!ll 5126.8 5129.9 78J 1.6 240 28:) 520 1.6 5130.4
S001il Conflu. 35+15 1020 5129.0 5131.6 170* 7.2 40 70 110 7.0 5131.5
41+30 1020 5135.1 5137.9 440 2.5 90 8J 170 3.3 5138.1
44+00 1020 5138.3 5141.4 29D 5.2 55 85 140 6.2 5141.6
46+95 1020 5142.7 5145.9 28J 3.6 40 60 100 4.5 5146.3
49+70 540 5147.5 5149.4 75 6.3 00 10 70 6.3 5149.4
53+80 540 5l!ll.0 5152.2 430 0.6 125 200 325 1.3 5152.7
56+50 540 5154.0 5154.7 m 3.7 130 120 2!ll 4.2 5155.0
m+30 275 5160.0 5100.8 385* 1.6 170 200 370 1.5 5160.9
washington St. IiOi85 275 5100.8 5167.8 390 1.0 1!ll 240 390 1.0 5167.8
61+35 275 5161.5 5167.8 655 0.2 130 2&:l 390 0.2 5167 .8
63<00 275 5167.8 5168.7 230 3.7 90 00 150 3.9 5168.7
66+95 275 5170.2 5171.2 220 1.3 25 95 120 1.7 5171.4
69+00 275 5178.8 5179.4 226 3.7 30 !ll 8J 4.8 5179.5
fbtes : 1. O1stance fran confluence along chamel ,efe, ..ICe li...
2. Mean velocit;y in ehamel.
3. Fran chamel reference li.. looking oo.nstrean.
4. Mean veloci~ in fl~.
* floodplain width includes area of h)<Irau11cally discon.-cted fllW.
** Fl"",*>lain width ooes not inclOOe area of lnichulically diSCOo.oected fllW.

fbtes :

1. O1stance Fran confluence along chamel reference li...
2. Mean velocit;y in ehamel.
3. Fran ehamel reference li.. looking _strean.
4. Mean veloci~ in flOOlloii\Y.

*
**

Fl"",*>lain width includes area of hydraulically discon.-cted fllW.
Floodplain width ooes not inclOOe area of hydraul ically diseomected fllW.