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<br /> <br /> <br />Feasibility Report <br />Northeast Lino Lakes Drainage Improvement Project <br />WSB Project No. 2029-790 Page 10 <br />primarily an open channel, the system will not be constrained by a pipe size as is the case under <br />current conditions, and will be more adaptable to climate change and future development <br />requirements. The channel can drain the regional storage systems effectively and efficiently, <br />thereby minimizing the bounce in ponds from successive storm events. It also provides a known <br />normal water elevation in the low areas, around which the designers may build future <br />development to be safe from flooding. <br /> <br />Option 4 also includes a new crossing under I-35E near the existing ACD 55 crossing (Appendix <br />A, Figure 9). Final design and coordination with RCWD and MnDOT will determine if this <br />crossing is a single crossing or two smaller crossings under I-35E. <br /> <br />4.2. Proposed Drainage Improvements <br /> <br />The Peltier Lake outlet improvement and crossing under I-35E via a storm sewer pipe system is <br />recommended as the most cost-effective alternative. The proposed project (Appendix A, Figure <br />9) includes: <br /> Replacing the existing culvert under Peltier Lake Drive <br /> <br /> New open channel ditch conveyance from Peltier Lake Drive to 20th Avenue <br /> <br /> New 60-inch storm drain crossing under I-35E to proposed regional storage facility <br /> <br /> New regional storage facilities, phased with future developments, to provide flood <br />control storage and additional water quality treatment opportunities <br /> <br /> A public greenway corridor with additional water quality features, such as iron- <br />enhanced filtration or biofiltration <br /> <br /> Outlet control structures with gates on selected regional storage facilities to minimize <br />the risk of adversely impacting flood levels on Peltier Lake <br /> <br /> Preserve the agricultural drain tile system to maintain upstream drainage rights until <br />all land within the study area develops. Drain tile may be abandoned or realigned as <br />development progresses, at the benefitted landowners’ expense and discretion. <br /> <br />The conceptual layout and system details are provided in Appendix E. Additional design <br />requirements proposed for land development within the study area are summarized in Appendix <br />B. <br /> <br />4.3. Storm Sewer and Stormwater Management <br /> <br />The City’s proposed storm sewer system and drainage design requirements will be in <br />conformance with the City’s performance standards, and as permitted by RCWD. <br /> <br />Construction of a stormwater collection and conveyance system will be necessary to direct <br />stormwater to the new crossing and constructed channel. This system will reduce flooding