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IINCM KE j, <br />PELTIER LAKE PONDS and GREENWAY CORRIDOR <br />Proposed drainage alignment <br />June 2014 <br />DESIGN NOTES: <br />0 Proposed 72 -in RCP culvert crossings <br />0 Proposed open channel reaches <br />0 Proposed 48 -in RCP culvert jacked under 35E <br />0 Proposed manhole outlet control structure - <br />to be designed to protect wetlands and manage floodplains <br />• <br />L <br />City rJr Lirjs Liikke5 <br />495 Elrr�� . <br />Dna <br />Volume -X4'1 ac -Ft <br />Downstream Invert = 890.0' <br />Upstream Invert = 896.2' <br />Channel Length = 6,154 -ft <br />—I 1 <br />Peltier <br />Lake <br />Ur( OF LINO LAitE.1 <br />crr, of 7EarEityIyLE_ - <br />:I 1:1-1 <br />i ?r <br />11 <br />1 -17T -M -11— <br />I • i <br />7 <br />1,sa <br />I <br />i <br />7Llr.i6u'=1•=1 1a triI �(- <br />City r)f 1 -lint. <br />2'15 icre5 <br />��uu:= =1, J!1 ir) <br />VJlurne 79 i c -ft <br />I <br />f, f j <br />177 <br />11, L ! 111 11' -- <br />1 <br />i`lld� <br />71 <br />' s <br />1 > <br />: N <br />21411 - <br />- • <br />._. _ ___L 1 • <br />- <br />LEGEND <br />Proposed Culverts <br />Proposed Channel <br />100 -ft Right -of -Way <br />—I <br />Proposed Benefitted Area <br />MN Existing Wetlands <br />74 Wetland Preservation Corridor <br />ACD 55 <br />�—°— ACD 72 <br />Anoka County Parcels <br />0 TYPICAL OPEN CHANNEL CROSS-SECTION <br />3 <br />T100 -FT <br />10- to 15 -FT <br /><-10-FT--> <br />Typical channel cross-section has a 10 -ft bottom width with 3H:1 V side slopes and an average depth of 10 -ft with <br />0.1% longitudinal slope. <br />•i I <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 @ $6.00/CY = $3,000,000 <br />• Preliminary cost per acre benefitted = $4,500 to $5,600 <br />0 1,200 <br />Feet __ <br />