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Feasibility Report Northeast Lino Lakes Drainage Improvement Project WSB Project No. 02029-790 Page 4 3. EXISTING CONDITIONS 3.1. Drainage Areas and Drain Tile The Northeast Area is serviced by three Anoka County drainage systems, Anoka County Ditch (ACD) 72 and Judicial Ditch (JD) 2 in the north and ACD 55 in the south (FIGURE 2). ACD 72 and JD 2 discharge directly to Peltier Lake, while ACD 55 enters Clearwater Creek, or Judicial Ditch (JD) 3, to the south before discharging into Peltier Lake. The remainder of the study area surface flows directly to Peltier Lake. The county ditches within the study area are all agricultural drain tile systems that serve an area of approximately 1,400 acres within the Cities of Lino Lakes, Centerville, and Hugo. These properties are entitled to the benefits of the drainage system and, in effect, own the drain tile system under Minnesota Statues 103E (Minnesota Department of Natural Resources 1991). The drainage of the system must be maintained in perpetuity, until such time the assessed land owners choose to petition RCWD for the abandonment of the drain tile on their property. The majority of the land in the study area is agricultural (Table 1) and drained to the ditch system via unbuffered surface inlets (Appendix A, Figure 3). Table 1. Existing land uses and areas Land Use Area (acres) Agricultural 1,059 Multifamily 2 Open Space/Conservation 116 Right-of-Way 43 Rural Residential 141 Single Family Detached 12 TOTAL 1,373 The low points in the study area remain inundated for weeks following the 100 year event due to the limited pipe capacity in the ditch system. Because the low lying areas take so long to drain back to their normal water levels, the next rain event may compound the flooding beyond the 100-year flood level. Without any drainage improvements, future developments in this area are required to design to retain the 100-year back-to-back events. 3.2. Storm Sewer There is storm sewer within the study area of Lino Lakes along Otter Lake Road and the McDonald’s site. Due to the limited capacity of the existing drain tile system, McDonald’s was required to install a temporary spray irrigation system to reduce the stormwater volume from their site; however this is not a feasible long-term solution. The City of Hugo has stormwater infrastructure and storage which serves the development along the Lino Lakes and Hugo border.