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J Is <br />RNO[ KES <br />pC ]T1C °' CSC! ?CLADS, ERE <br />s4k_brq av CORMEDONe end <br />GH] <br />G°3O!ik G�Laor z T <br />Proposed drainage alignment <br />Manhole Outlet Control Structure <br />To be designed to protect wetlands and <br />manage floodplains. <br />City !f" 1-1u8 <br />2'15 acre:. <br />f1100 = .4 3'3 lfl <br />Downstream Invert = 890.0' <br />Upstream Invert = 896.2' <br />Channel Length = 6,154 -ft <br />48 -in RCP jacked under 35E <br />4F "i ei r_sief ?nVji�_ <br />LEGEND <br />Proposed Culverts <br />Proposed Channel <br />100 -ft Right -of -Way <br />Existing Wetlands <br />Wetland Preservation Corridor <br />Proposed Channel Benefitting Area <br />Lino Lakes Benefitting Area <br />Hugo Benefitting Area <br />ACD 55 <br />ACD 72 <br />RCWD Ditch <br />RCWD Pipeline <br />RCWD Stream /River <br />Anoka County Parcels <br />sr. <br />sTe <br />TYPICAL OPEN CHANNEL CROSS- SECTION <br />3 <br />100-FT <br />10- to 15 -FT <br />- 10 -FT—> <br />rir . \ `IAN',: rs i 4itr®r m ' . <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. Typical channel cross - section has a 10 -ft bottom width with 3H:1V side slopes and an average depth of 10 -ft with 0.1% longitudinal slope. <br />3. Storage will be provided in- channel with four 1 8 -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 />4. 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 />PREL@MINAIP,V 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 0 1,200 <br />(�( r JI ! SB <br />• Preliminary cost per acre benefitted = $4,500 to $5,600 1 Feet <br />