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3.13. Water Resource Related Agreements The Cities of Lino Lakes and Centerville have entered into a Joint Powers Agreement for regulating water for which the two Cities have jointly adopted and enforce ordinance requirements. 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. Anoka Washington Judicial Ditch 3 — All Branches & Main Branch The 100 -year 24 hour rainfall event is considered critical in the upper and lower portions of the Anoka - Washington Judicial Ditch 3. The 10 -day snowmelt event is considered critical in the middle portion of the system. The 100 -year floodplain boundary is relatively narrow due to the large amounts of storage provided by the natural lakes and constructed stormwater ponds in the system. No public roadway structures on the main trunk are overtopped in the critical 100 -year event (Houston Engineering, 2013a). Ramsey County Ditch 8 The culverts at the primary road crossings are sufficiently sized to convey flood flows from the public drainage system. None of the crossings are overtopped by the 100- year critical flood event (Houston Engineering, 2013a). Rice Creek Currently, road crossings are sufficiently sized to convey 100 -year flood flows without overtopping, with the exception 85th Avenue, also known as County Road J. Currently; the restriction is caused by the downstream trail crossing. As previously mentioned, Rice Creek will undergo a channel restoration and realignment that is slated to begin in the winter of 2015-2016. The goals of this project will be to restore a more natural, meandering path. This project should prevent the 100 -year event from resulting in overtopping. Anoka County Ditch 55 The Anoka County Ditch 55 consists of a series of buried drain tiles that have historically been prone to blowouts at multiple locations. The system currently experiences surcharges even during moderate 2 -year 24-hour rain fall events. As a result, RCWD has completed an analysis of repair options for County Ditch 55 (HEI Memo 6/19/14). Repairs to ACD 55 are slated to take place over a span of several years. Significant future development is planned for the drainage area to ACD 55, planning will be extremely important since ACD55 discharges to Clearwater Creek and ultimately to Peltier Lake. City of Lino Lakes SWMP 1 December 20151 61