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10-10-11-WS
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10-10-11-WS
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ARDEN HILLS CITY COUNCIL WORK SESSION—OCTOBER 10, 2011 3 <br /> which is probably not worth the investment of $150,000 to $175,000 required to do all <br /> improvements. <br /> Option 4. Mr. Thomas explained that none of these options result in meaningful changes <br /> to the two low points in the development. So, they stepped out of that approach and <br /> considered doing something above and beyond the existing system. What they came up <br /> with would be adding a secondary storm sewer at the south end low point which would <br /> include adding another set of catch basins and a whole new piping system to an existing <br /> wetland pond area at a cost of $75,000 to $80,000. Their modeling with this addition <br /> showed that a 100 year event would probably be contained with both systems working <br /> together. However, even with that improvement, the system does not compare to an <br /> emergency overflow as it is still a landlocked area with no naturally graded overflow so <br /> there will always be that potential for flooding. <br /> Mr. Thomas stated that it is their opinion that such improvements would be considered private <br /> improvements because they are serving a private area within the association and the pipe itself <br /> would be constructed within private property. <br /> Mayor Grant questioned where the overland solution is for this property. <br /> Public Works Director Maurer stated that the overland solution would probably not be <br /> acceptable to the Association or the people who live there because significant grading and <br /> retaining walls would be required to get the level low enough. He explained that essentially what <br /> the modeling completed by Bolton and Menk has shown is that if all the catch basins are operating <br /> at full efficiency in a 100 year storm event (6 inches of rainfall in 24 hours) the current system <br /> should be able to handle the drainage with minor flooding in the streets, driveways, and grass <br /> areas. <br /> Mr. Thomas pointed out that with no emergency overflow, whatever system is put in will have a <br /> finite capacity. <br /> Councilmember Tamble asked if there had been any modeling done that included taking the <br /> drainage straight west and connecting to the pond there. He asked if it was feasible to connect the <br /> storm sewer from where it ends on the north end to the pond to the west. He also asked if doing <br /> so would relieve more pressure than option 4. <br /> Public Works Director Maurer explained that they chose to go with a proposal that was a <br /> shorter distance. <br /> Mr. Thomas stated that Councilmember Tamble's suggestion might result in a minor reduction <br /> but would be the same benefit as their proposal. <br /> Mayor Grant asked if the pond to the north drains to the larger pond north of it and if they would <br /> consider enlarging the pond so it holds more water. <br /> Lani Leichty, Bolton and Menk, responded that it currently dumps into the north pond but then it <br /> all drains to the south. <br />
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