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<br />Updated Stonn Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br /> <br />7. 2005 <br /> <br />The Metropolitan Council has requirements for local water management plans. <br /> <br />This Surface Water Management Plan Update is designed to address current <br />requirements governing local water management plans. The general boundary of <br />the plan includes all property within the City limits of Ramsey. When accepted <br />by all local, regional, state and federal agencies having jurisdiction, the City of <br />Ramsey will be the sole responsible party for administering this plan. <br /> <br />B. General Content of Required Local Plans <br /> <br />This SWMP follows the general report structure listed in Minnesota Rules Chapter <br />8410.0170, the general requirements in Minnesota Statute sl:?ctions 103B.205 - 103B.255, <br />and the Metropolitan Council's requirements for local water management plans as <br />adopted May 2005 as part of the Metropolitan Council's Water Resources Management <br />Plan. <br /> <br />C. Summary of the Goals, Problems, and Potential Solutions <br /> <br />The general findings of this Surface Water Management Plan report are summarized as <br />follows: <br /> <br />1. Ramsey is located in the Anoka Sand Plain. The area is well known for its <br />highly permeable soil. As such, the runoff from significant rainfalls is generally <br />reduced to the extent that the existing drainage network functions well with no <br />significant flooding outside the Mississippi River, Rum River, TrottBrook, Ford <br />Brook, County Ditch 43 and County Ditch 66 flood plains. <br /> <br />Because of the pervious nature of the Anoka Sand Plain, the City will need to <br />review its development ordinances to mitigate the adverse effect that a Significant <br />increase in impervious surfacing and mass grading can have on runoff conditions. <br />The addition of significant amounts of impervious surfaces and the reduced <br />penneability associated with the soil compaction in mass grading without a <br />reasonable attempt to restore or duplicate the current infiltration pattern could <br />create very significant increases in runoff volumes and downstream flooding. <br />This is especially true in the Trott Brook, D66, EMiss and WMiss watersheds <br />(see Figure 9), where improvements in uppermost watershed limits must flow a <br />significant distance to the ultimate watershed outlet. The longer flow path <br />associated with each of these watersheds allows greater opportunities for peak <br />flows from conventional detention ponds to coincide. <br /> <br />One solution to the problem of coincident peak flows is the use of low impact <br />development techniques. The current low-density residential developments in <br />northern Ramsey are a close approximation of what alowimpact development <br />can be like. This area has a noticeably lesser stonn water impact than that of <br />either high-density residential developments or commercial/industrial <br />developments. <br /> <br /><<:l Bollon & Menk, Inc. 2008. All Rights Reserved <br />Section II <br /> <br />Page 4 <br /> <br />M13.39530 <br />October 13, 2008 <br />-196- <br />