02-08-2016 Council Packet - Laserfiche WebLink

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3.14. Intercommunity Flows The City of Lino Lakes is surrounded by several neighboring communities and receives watershed runoff from Blaine, Centerville, Columbus, Hugo, Shoreview, and White Bear Township. Rice Creek Watershed District (RCWD) has estimated the flows to its jurisdictional reaches and, as such, downstream communities, like Lino Lakes, are required to include their allocated flows in their future planning studies, so as to limit adverse impacts to their downstream neighbors of Centerville, Hugo and Circle Pines (Figure 28). The city is contemplating an alternate outlet for build -out conditions pursuant to the development of a Comprehensive Stormwater Management Plan (CSMP) under RCWD Rule C.5 (f). Intercommunity flows and modeled peak flow rates as provided by RCWD are shown below (Table 8). A detailed figure showing all stormwater ponds, streams, lakes and wetlands and structural pollution control devices, pipes, pipe sizes, and conveyances is provided as a larger map in Appendix E. Comment from RCWD Dec. 2, 2015 Letter 4. Section 4.1: • Section should also include discussion on the city's intent to adopt alternative standards or "special rules" within the ACD 55 drainage area to ensure no adverse impacts by limiting the rate of discharge to be less than existing conditions. The City should indicate their proposed Comprehensive Stormwater Management Plan (CSMP) as their approach to reaching these standards. Note that the District would adopt these standards as well. • Statement "Without mitigation, the inevitable impacts from the proposed development will be increased volume and increased peak flows of surface water runoff' is true locally, but not if served by ACD 55, which would restrict downstream flows. Please incorporate this into the text. Response: Text updated on page 63, 64 of SWMP. See yellow highlighted section below. 4.1 Water Rate & Quantity Issues Within the City of Lino Lakes, streams, lakes, and wetlands have been subjected to increased surface water runoff rates and volumes. Increased discharge rates and volumes have caused serious down -cutting and stream bank erosion in some areas. Increased runoff rates and volumes also contribute to flooding concerns and water quality concerns. These issues are likely to intensify in the future. The Metropolitan Council prepared and adopted a regional growth strategy that anticipates further urbanization of the City. In addition, transportation improvements in or near the City will facilitate and precipitate urbanization. The City of Lino Lakes is planning for development of 1,400 acres east of Peltier Lake, North of Main Street. Furthermore, the City of Hugo is planning for development of a 215 acre area; both areas are currently being drained by Anoka County Ditch 55 (ACD 55). Currently, precipitation events larger Emmons & Olivier Resources, Inc. - page 3 of 5