11-27-2017 Council Packet - Laserfiche WebLink

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Comprehensive Stormwater Management Plan Northeast Lino Lakes Drainage Improvement Project WSB Project No. 2929-79 Page 25 8.1 Interim Conditions The intent of this CSMP is to define the final build-out conditions for the Northeast Lino Lakes Drainage Area; however, it is highly unlikely the entire study area would develop at once. At this point in time, it is anticipated that the proposed stormwater conveyance system would be built from the downstream outlet at Peltier Lake to the east as private landowners choose to develop their property and abandon the agricultural drain tiles. The City will review all proposed development projects in this area against the CSMP design standards and require a detailed hydraulic review of temporary construction conditions from the developer. It is expected that developers may wish to utilize the existing drain tile system to discharge stormwater until the downstream regional BMPs and outlet are constructed. This hydraulic review will be at the developer’s expense, must utilize the modeling presented in this CSMP for consistency, and will summarize the following information: Identification of the drain tile system and existing allocation of drain tile capacity Incorporation of any watershed changes since the previous modeling was completed, including update of curve numbers, time of concentration, and man-made infrastructure changes Current capacity of the drain tile system, reflective of the watershed updates, for the 2-, 10-, and 100-year 24-hour design storms, as well as the 100-year 10-day snowmelt event. Proposed discharge rates for the 2-, 10-, and 100-year 24-hour design storms, as well as the 100-year 10-day snowmelt event. Identification of any proposed impacts to upstream or downstream benefitted landowners and Peltier Lake Compliance with the design standards outlined in this CSMP does not alleviate the developer from obtaining all necessary and required permits. It is highly recommended that developers submit permit applications to RCWD and the City of Lino Lakes early to facilitate the design review, especially for any variances or temporary use of the existing drain tile system.