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Lino Lakes Local Water Management Plan 26 November 2018 – WSB Project No. 02988-500 2.5 Stormwater Management System Hydrologic boundaries do not stop at the municipal borders and orderly coordination between related municipalities is addressed in the Lino Lakes Resource Management Plan (RMP). Hydrologic boundary based, RMUs identified in the RMP are the basis for neighbor community coordination of shared water resources. The modeling encompasses true watershed catchments even where the boundaries are outside the municipal boundaries. The RCWD District-Wide Regional Model covers small portions of land area within North Oaks, Hugo, and Blaine, as well as all of Centerville. RCWD has similar, larger, boundaries and modeling 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 1800s and early 1900s. 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 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 Figure 2-7. 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. 2.6 Water Quality Data and Impairments Water quality data for the city has been obtained from the MPCA Environmental Data Access site. This database is utilized by the participating agencies to compile water quality testing data and is almost entirely used for the storage of water quality parameters. Many waterbodies in Lino Lakes are currently identified on the state List of Impaired Waters (Figure 2-8), also known as the 303(d) List from the applicable section of the Federal Clean Water Act. These waters are ones that do not currently meet their designated use due to the impact of a particular pollutant or stressor. If monitoring and assessment indicate that a waterbody is impaired by one or more pollutants, it is placed on this list. For each water body on the list, the MPCA is required to conduct a study to determine the allowable Total Maximum Daily Load. Impaired waters in Lino Lakes are summarized in Table 2-18.