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C 1 S'l � � 01 <br />IINQ1J KL, <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 />City off Lint) L iik <br />495 cirr '5 . <br />Yolurnr- = 74'1 ac -Ft <br />Downstream Invert = 890.0' <br />Upstream Invert = 896.2' <br />Channel Length = 6,154 -ft <br />Peltier <br />Lake <br />cfi"f OF LIi1O!A,tEi <br />crr, OF 7EaTEityIc-E <br />City of 1-Iu�U <br />2'15 <br />Qluu := <br />YJlurne ' 79 iv...-Ft <br />1 <br />11_11, <br />• <br />r r <br />11 71' <br />it ' " <br />tIU;�V��J q�risrir "ICI <br />7I=(� 1411; =1_..1 a ITi •,.1 <br />/�luru , 3JYS_ �0 rr r <br />` 11Ji I I 1 ..i ; 1 -r, i i-r <br />, <br />r I_ {��L "H.-__. <br />f �� • 1 <br />1I fU* iii 10 - <br />1 [T 1 _ .1:i 1 1 ,i.,,_ Lit y <br />( ��. r.. <br />ILi L_ <br />---i — is <br />r <br />I <br />- <br />LEGEND <br />Proposed Culverts <br />Proposed Channel <br />100 -ft Right -of -Way <br />Proposed Benefitted Area <br />Existing Wetlands <br />X°',; Wetland Preservation Corridor <br />• ACD 55 <br />ACD 72 <br />I I <br />Anoka County Parcels <br />0 TYPICAL OPEN CHANNEL CROSS - SECTION <br />3 <br />T100-FT <br />10- to 15 -FT <br />;a , . • <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 />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 />o 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 t� <br />Feet <br />B <br />