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Regular City Council Meeting Monday, October 25, 2010 Page 6 Mayor Klausing closed the Public Hearing at 6:38 p.m. City Engineer Debra Bloom addressed those drainage concerns expressed; noting that any future development of the lot(s) would require a permit from Rice Creek Watershed District as well as the City when a Building Permit application was submitted, but not at this platting level, since even though it is under an acre, it was adjacent to a protected wetland and that the developer would need to be in- compliance. At the request of Mayor Klausing, Ms. Bloom responded to concerns with exist- ing drainage issues, noting that this was a low point on Chatsworth, and concur- ring with the location of two catch basins as described by residents, and their presentation of the area's drainage. Ms. Bloom advised that the area was part of the City's comprehensive surface water management system, and that staff was aware of problems in the area, thus their rationale for applying the condition for approval. Councilmember Johnson observed that if the subdivision was approved and given drainage issues and not changing the natural drainage flow, it seemed prohibitive that a building be located on the front of that lot; or questioned what other reme- dies were available to mediate water flow; and questioned if rain gardens could work on this lot or if the topography was too severe. Ms. Bloom advised that any future improvements would need to be reviewed to ensure that they didn't block drainage and that outlets were at elevations similar to those today, with no grading permitted that would increase the elevation; but that the lot(s) could be re- graded to make a drainage swale work; but that rain gardens would not work as they usually could only facilitate 1" rains. Ms. Bloom expressed appreciation for the knowledge provided by residents com- pared to and consistent with her observations from walking the site. Further discussion included assurances required and standards applied by staff in granting administrative approval, such as any grading plans that could change the topography; location of future structures and how drainage would be accommo- dated; overland flow of water on this lot to move water to the wetland on the west; and options, including biofiltration, to treat storm water; sufficient drainage and existing swales; calculations to ensure a swale is adequately sized to move water; use of existing pipe versus installing a new pipe; and utility easements in place on both sides. Councilmember Roe clarified that, if the applicant could not come up with a plan, as detailed in Condition A, for City approval, would the subdivision become void.