01-08-2018 Council Meeting Packet

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DRAFT 2040 Comprehensive Plan Update – Local Water Management Plan 19 December 27, 2017 - Project CLL17010 outside the municipal boundaries. The modeling covers small portions of land area within North Oaks, Hugo, and Blaine, as well as all of Centerville. Rice Creek Watershed District has similar, larger, boundaries called Resources of Concern (ROC), that are delineated based on lakes, while the City of Lino Lakes’ RMUs are subsets within the RCWD ROCs. Public Ditch System The State of Minnesota has established a set of rules (Minn. Statute 103E) to provide an opportunity for individual landowners to obtain drainage and to minimize the effects to downstream landowners. There are a number of County Ditches (Nos. 8, 10, 22, 25, 32, 47, and 55) and two Judicial Ditches (Nos. 2 and 3) that run through the City. The majority of the drainage system was constructed during the late 1800’s and early 1900’s. Over the decades, much of the system was minimally maintained by different ditch authorities. Today, many ditches function as straightened creeks within a partially or marginally drained wetland slough or riparian corridor. The major public ditch systems in Lino Lakes are: Anoka County Ditch (ACD) 10-22-32 ACD 25 ACD 47 (abandoned) ACD 55 ACD 72 Judicial Ditch (JD) 2 (Hardwood Creek) JD 3 (Clearwater Creek) In Lino Lakes, Anoka and Ramsey Counties have delegated the jurisdiction over all public ditches to the Rice Creek Watershed District (RCWD), who has the authority for managing the drainage systems, including improvements and repairs. Thus, the RCWD is the ditch authority for the purposes of implementing Minnesota Statute §103E (Drainage Law). There are a number of private ditches within the City that are not managed under Minn. Statute 103E, instead are managed individually by private landowners. Municipal Storm Sewer and Stormwater Treatment Features The City’s storm sewer network and catalogued best management practices (BMPs) treatment devices and structures, as available in GIS, are shown in Appendix A, Figure 8. The City is also actively updating their infrastructure database and will be adding information, such as BMP normal water levels (NWL) and high water levels (HWL) in the future, but was not comprehensively available at this time. The RCWD also has hydrologic and hydraulic information available for the system and should be contacted if that information is needed. The numbering system and level of resolution of the RCWD data and modeling was not consistent with City information, so the RCWD information should be obtained directly from the RCWD. 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 D. 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. 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 2-0-18). The City intends to either maintain or reduce intercommunity flow rates relative to the established benchmarks through its goals and policies as well as deference to RCWD rules. Table 2-0-18. Benchmark Intercommunity Flow Rates Receiving City Watercourse Peak Flows [cfs] 2-Year 24-Hour Rainfall 10-Year 24-Hour Rainfall 100-Year 24-Hour Rainfall 100-Year 10-Day Snowmelt Centerville JD 3 Main Trunk 160 266 439 394 Circle Pines RCD 8 Main Trunk 6 14 29 36 Circle Pines Rice Creek 111 273 570 1206 Hugo JD 3 Branch 4 25 40 66 34 Hugo JD 3 Branch 1 8 14 25 24 Centerville ACD 55 Main Trunk 4.7 20.2 63.4 ---