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PELTIER LAKE PONDS and GREENWAY CORRIDOR <br />LNOLAK <br />Proposed drainage alignment <br />June 2014 <br />DESIGN NOTES: <br />O Proposed 72 -in RCP culvert crossings <br />0 Proposed open channel reaches <br />0 Proposed 48 -in RCP culvert jacked under 35E <br />O Proposed manhole outlet control structure - <br />to be designed to protect wetlands and manage floodplains <br />riry Hf Lino Lui7.±; <br />4-'95 <br />-r <br />- <br />Ipl! trrla. _ 24'1 Jr-fr <br />Downstream Invert = 890.0' <br />Upstream Invert = 896.2' <br />Channel Length = 6,154 -ft <br />;-1Lie <br />a k <br />crrr or LULU L( .r.' <br />CU( JP �cfTTPit�1t! E <br />,_:L I_- I. <br />! JP; -1 : : fl .d.: : : ,..,' .'". ' : 7 . ' ..' - : _'' 6 !1' :: ri 1 . l' 1 .f -'..r: rz.il.: j.1.1' r I:. .1 7 1:- :f 1:1 i_ i.j ‘il;' 1 211 11 -II —..' . ,- : - Hi'l , , r:71 -11 <br />i7,-. - - .I. <br />'^ <br />i,/lit y=`t� <br />if r<_ ,r-- <br />1 <br />r-''lITT TT7r n4 + ;� <br />- _; ,.'.i <br />City urr flu:3t.) <br />2'15 a rw:; <br />�),r.J _ 4.'J Irl <br />\/rj1Jrri -- /9 =lr-(r <br />L y I' �a_f L} i f I' <br />r i 'r <br />T. <br />_ 1 <br />i r �� 3, i'! , i } <br />i r f • i i rT -,--I <br />,-r <br />r- r <br />L, L. <br />.. . T <br />• <br />fLEGEND � -- <br />t <br />:171 '' } ' ' ,r <br />r <br />T. <br />Proposed Culverts <br />----- Proposed Channel <br />--- 100 -ft Right -of -Way <br />*IJ <br />Proposed Benefitted Area <br />Existing Wetlands <br />/j/1 Wetland Preservation Corridor <br />ACD 55 <br />ACD 72 <br />Anoka County Parcels <br />TYPICAL OPEN CHANNEL CROSS-SECTION <br />3 <br />100 FT <br />10- to 15 -FT <br />10 -FT--> <br />Typical channel cross-section has a 10 -ft bottom width with 3H:1V side slopes and an average depth of 10 -ft with <br />0.1% longitudinal slope. <br />CONCEPTUAL DESIGN NOTES: <br />1. Conceptual alignment shown, exact alignment will be determined based on future development plans and to avoid wetlands. Final inverts and <br />hydraulic capacity will be designed to protect existing wetlands and manage floodplain. <br />2. Storage will be provided in -channel with four 18 -inch high ditch blocks to span across the channel, it is anticipated that the 100 -year 24-hour runoff <br />event will be contained within the channel. <br />3. Stored water in the channel may be pumped for irrigation re -use and infiltration fields may be established along the channel to maximize the <br />infiltration of stormwater. <br />PRELIMINARY ESTIMATED COSTS: <br />• Jacking 48 -in RCP under 35E - 300 LF @ $1,400/LF - $420,000 <br />• 72 -in RCP under Co. Rd 54 - 80 LF @ $180/LF = $14,400 <br />• 72 -in RCP under Peltier Lake Dr - 75 LF @ $180/LF = $13,500 <br />• Channel excavation - 500,000 CY @ $6.O0/CY = $3,000,000 <br />• Preliminary cost per acre benefitted = $4,500 to $5,600 <br />0 <br />1,200 A <br />Feet WSB <br />.{- dvwri:ao. !m , <br />