b l u e s p r u c e s t e v a k i c o u l q m e s h "ß base project dbl 10x4 box culvert Åf...

. Vacate Street and Remove Vacate Street and Remove Å F Å F 469TH AVE 35 36 2 1 11 12 2 1 274TH ST 273RD ST JORDAN DR ATKINS PL FRONTIER ST BLUE SPRUCE ST DAGGETT PL STAGECOACH RD CYPRESS AVE SEQUOIA AVE ADRIANNA PL LEWIS PL HEMLOCK AVE REDWOOD AVE P R A I R E W I N D R D MICHELLE CIR U V 110 U V 111 ß "" ß "" Å F Å F Diversion Channel - 75 ft wide Detention Area 2 Diversion Channel - 65 ft wide Main Channel Increases - 40 ft wide Detention Area 3 Minor Collection Channel - 35 ft wide Lincoln County SD Tea Tributary Flood MitigationProject Detention Area 1 0 100 200 300 400 500 600 700 800 Feet Map Date 06/24/2011 Typical channel increases follow existing channel and within the 2 north and south diversions. Typical channel = 10 foot bottom, 4 to 1 side slope. Box culverts at county roads with 3 detention sites. No improvements to non-increased existing channels. Surface Restoration expected up to 100 ft wide. Constant flow mitigation through 8" drain tile installed from last collection channel T to Hwy 111 right of way. ß "" Base Project Dbl 10x4 Box Culvert Å F Base Project 25yr Steel Culverts Detention Areas ( 90 Ac Ft Req.) Area 2 15 Ac Ft ( 2.5 acres x 6 ft ) Area 3 60 Ac Ft ( Minimum 10 acres x 6 ft ) Area 1 15 Ac Ft ( 2.5 acres x 6 ft ) Ditch Cleanout Existing Channel Channel Increases $ Proposed Flood Plain Current Flood Plain Property Lines Drain Tile 8" drainage tile continuous to outlet at Hwy 111 approx. 10,000 ft total ( drain plow installed) See Inset Map k 274TH ST 275TH ST U V 111 Tea Tributary To Beaver Creek Inset Map

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Page 1: B L U E S P R U C E S T E V A K I C O U L Q M E S H "ß Base Project Dbl 10x4 Box Culvert ÅF Bas eProj ct 25yr Steel Culverts Detention Areas ( 90 Ac Ft Req.) Area 2 15 Ac Ft ( 2.5

.Vacate Streetand Remove

Vacate Streetand Remove

ÅFÅF

469T

H AV

35 362 1

11 122 1 274TH ST

273RD ST

JORD

AN D

ATKI

NS PL

FRONTIER ST

BLUE SPRUCE ST

DAGGETT PL

STAG

ECOA

CH R

CYPR

ESS A

SEQU

OIA A

ADRI

ANNA

LEWIS PL

HEM

LOCK

AVE

REDW

OOD

AVE

PRAIRE WIND RD

MIC

HELL

E CI

UV110

UV111

"/Ñ

ß" "DD

ß" "

ß" "DD

ÅF ÅF

Diversion Channel - 75 ft wide

DetentionArea 2

Dive

rsion

Cha

nnel

- 65 f

t wide

Main Channel Increases - 40 ft wide

DetentionArea 3

Minor CollectionChannel - 35 ft wide

Lincoln County SDTea Tributary

Flood MitigationProject

Detention Area 1

0 100 200 300 400 500 600 700 800FeetMap Date 06/24/2011

Typical channel increases follow existing channeland within the 2 north and south diversions. Typical channel = 10 foot bottom, 4 to 1 side slope.Box culverts at county roads with 3 detention sites.No improvements to non-increased existing channels.Surface Restoration expected up to 100 ft wide.Constant flow mitigation through 8" drain tile installedfrom last collection channel T to Hwy 111 right of way.

ß" "Base Project Dbl 10x4 Box Culvert

ÅFBase Project 25yr Steel Culverts

Detention Areas( 90 Ac Ft Req.)

Area 2 15 Ac Ft ( 2.5 acres x 6 ft )Area 3 60 Ac Ft ( Minimum 10 acres x 6 ft )

Area 1 15 Ac Ft ( 2.5 acres x 6 ft )

Ditch Cleanout

Existing ChannelChannel Increases

$Proposed Flood PlainCurrent Flood PlainProperty Lines

Drain Tile

8" drainage tile continuousto outlet at Hwy 111

approx. 10,000 ft total( drain plow installed)

See Inset Map k