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274TH ST

273RD ST

JORD

AN D

R

ATKI

NS PL

FRONTIER ST

BLUE SPRUCE ST

DAGGETT PL

STAG

ECOA

CH R

D

CYPR

ESS A

VE SEQU

OIA A

VE

ADRI

ANNA

PL

LEWIS PL

HEM

LOCK

AVE

REDW

OOD

AVE

PRAIRE WIND RD

MIC

HELL

E CI

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UV111

UV110

Legend

ß" " All Options - Double Box Culvert"/Ñ Option 1 - Single Box Culvert

ß" "DD Option 1 - Double Box Culvert

ß" "DD Option 2 - Double Box CulvertÅF Option 1 or 2 - Steel Culverts

Tentative DetentionRevised Flood PlainProperty Lines

Lowest Adjacent GradesBelow BFE0ft to .5 ft above.5ft to 1ft above1ft to 2ft aboveover 2 ft above $

0 100200300400500600700800 Feet

Diversion Channel - 75 ft wide

Existing Detention

TentativeDetention

Site B

Dive

rsion

Cha

nnel

- 65 f

t wide

Chan

nel -

40 ft

wide

TentativeDetention

Site A

Minor CollectionChannel - 35 ft wide

Map Date 1/06/2011

Follows existing stream bed with typical channel. Existing constrictions along Blue Spruce Strequires 2 narrow channels on either side of roadway and 7 single 4x10 box culverts. Cleanout of channel and culvert at 274th Street

Diversion of main channel to East of Daggett residences. Cost removed of Dagget culvert.Steel culverts reduce cost on field access road.

Option 1

Option 2 Follows basic option 1, except diverts channel north of Blue Spruce Addition to substantiallyreduce culvert, excavation, restoration and maintenance costs. Vacating and removal of Blue Spruce Street at the diversion channel yields additional reduction in costs by 1 culvert.

Option 3

Increase existing stream capacity and culverts to contain 100 year flows within the channel at least below all lowest adjacent grades: The typical channel is 10 feet wide at the bottom with 4 to1 slope averaging 40 feet wide at the top. Culverts are typically 4x10 double box culverts. Frontier Street would be removed at channel.

Tea Tributary Flood Mitigation Project Alternatives

TentativeDetention

Site C

TentativeDetention

Site D