01-08-2018 Council Meeting Packet

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DRAFT 2040 Comprehensive Plan Update – Local Water Management Plan 9 December 27, 2017 - Project CLL17010 1981-2010 Monthly Normal Temperature – Vadnais Lake NCDC Station Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Max 25.8 31 42.8 58.4 71 80 84.6 82 72.9 59.3 42.3 28.7 Min 7.1 11.6 23.7 37.6 50 59.4 64.1 61.8 52.8 40.8 27 12.8 Mean 16.5 21.3 33.3 48 60.5 69.7 74.4 71.9 62.9 50.1 34.7 20.7 Precipitation is often defined in terms of recurrence intervals, or the probability of a certain rainfall occurring during a given year. For example, a rainfall event of 6.13 inches has a 2% probability of occurring in any given year, which is also expressed as once in every 50 years, the 9.81 rainfall event has a probability of 0.2% and is expressed as once every 500 years. The following table presents the probability of typical design rainfall events within the City of Lino Lakes, including the 100-year 10-day snowmelt event. Table 2-0-2. NOAA Atlas 14 Design Storm Events (Sanja et al, 2013). Recurrence Interval [years] 1 2 5 10 25 50 100 100 200 500 1,000 Probability 100% 50% 20% 10% 4% 2% 1% 1% 0.5% 0.2% 0.1% Duration 24-hour 24-hour 24-hour 24-hour 24-hour 24-hour 24-hour 10-day 24-hour 24-hour 24-hour Rainfall Amount [in] 2.43 2.80 3.50 4.17 5.22 6.13 7.12 9.86 8.22 9.81 11.10 2.2 Topography, Soils and Geology Topography The topography of Lino Lakes is generally rolling, with the highest ground in the southeast corner of the City and the lowest around Baldwin Lake. The majority of Lino Lakes is dominated by the Rice Creek Chain of Lakes, interspersed with lakes, wetlands, streams and various judicial and county ditches. Soils Soils in Lino Lakes consist of Zimmerman fine sands, Rifle muck, and Isanti soil complexes (Soil Survey Staff 2017). In the northwest, the soils are predominately well-draining, on top of the Anoka Sand Plan, while on the southeast, the soils are poorly draining and result in a higher runoff potential compared to the northwest. The hydrologic soils group, a measure of the infiltration and runoff potential of the surface soils, is provided in Appendix A, Figure 2. Geology The surficial geology of eastern Lino Lakes are primarily glacial ice deposits of loamy tills with peat and muck around the Chain of Lakes and in isolated pockets (Appendix A, Figure 3). The loamy till is from the New Ulm formation and is chiefly loam texture with unsorted sediment. Peat and muck was deposited in the quaternary era and is composed of partially decomposed organic matter deposited in marshes. Peat and muck also includes fine grained organic matter laid down in ponded water and marl (Setterholm 2013). The western area of Lino Lakes is primarily lake deposits from the Late Wisconsin Pleistocene (Meyer 1993). Bedrock geology consists of sandstones (Appendix A, Figure 4). St. Peter Sandstone and the Prairie du Chien Group from the Ordovician and Lower Ordovician periods comprise the southeast corner of Lino Lakes. The northwest corner is made up of the Jordan Sandstone, the Tunnel City Group, and St. Lawrence Formation. Buried stream channels that are incised into several rock formations are a primary influence on the distribution of bedrock geologic units, including under the Rice Creek Chain of Lakes (Berg, 2016). 2.3 Resource Management Units The 2008 Lino Lakes Resource Management Plan identifies fifteen Resource Management Units (RMUs) or district hydrologic areas within the City (Appendix A, Figure 5). The purpose is to provide drainage-area specific management recommendations that address the unique conditions of the area. These RMUs are used in the development of goals and policies for the City’s surface water resources in Sections 3 and 4 and existing inventories for each are provided in Appendix B.