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<br /> <br /> <br />Feasibility Report <br />Northeast Lino Lakes Drainage Improvement Project <br />WSB Project No. 2029-790 Page 5 <br />3. EXISTING CONDITIONS <br /> <br />3.1. Drainage Areas and Drain Tile <br /> <br />The Northeast Area is serviced by three Anoka County drainage systems: Anoka County Ditch <br />(ACD) 72 and Judicial Ditch (JD) 2 in the north; and ACD 55 in the south (Appendix A, Figure <br />2). ACD 72 and JD 2 discharge directly to Peltier Lake while ACD 55 enters Clearwater Creek, <br />or Judicial Ditch (JD) 3, to the south before discharging into Peltier Lake. The remainder of the <br />study area surface flows directly to Peltier Lake. <br /> <br />The county ditches within the study area are all agricultural drain tile systems that serve an area <br />of approximately 1,300 acres within Lino Lakes, Centerville, and Hugo. These properties are <br />entitled to the benefits of the drainage system and, in effect, own the drain tile system under <br />Minnesota Statues 103E (Minnesota Department of Natural Resources 1991). The drainage of <br />the system must be maintained in perpetuity, until such time the assessed land owners choose to <br />petition RCWD for the abandonment of the drain tile on their property. <br /> <br />The majority of the land in the study area is agricultural (Table 1 and Appendix A, Figure 3) and <br />drained to the ditch system via unbuffered surface inlets. <br /> <br />Table 1. Existing land uses and areas <br />Land Use Area <br />(acres) <br />Agricultural 896 <br />Farmstead 10 <br />Institutional 0.2 <br />Right-of-Way 38 <br />Park, Recreational, or Preserve 15 <br />Single Family Attached 21 <br />Single Family Detached 37 <br />Undeveloped 276 <br />TOTAL 1,294 <br /> <br />The low points in the study area can remain inundated for weeks following the 100-year event <br />due to the limited pipe capacity in the county ditch systems. Because the low lying areas take so <br />long to drain back to their normal water levels, the next rain event may compound the flooding <br />beyond the 100-year flood level. Without any drainage improvements, future developments in <br />this area are required to design stormwater management facilities to retain 100-year back-to-back <br />events. <br /> <br />3.2. Storm Sewer <br /> <br />There is storm sewer within the study area in Lino Lakes along Otter Lake Road and the <br />McDonald’s site. Due to the limited capacity of the existing drain tile system, McDonald’s was <br />required to install a temporary spray irrigation system to reduce the stormwater volume from