CCP 11-12-2002 - Laserfiche WebLink

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I - --~<<; -- I W Ingerson ~ Court Geometry Discussion I I I I I I The proposed improvements include the realignment and necking down of the entrance to Ingerson Court from Ingerson Road as shown in the exhibits, This geometrical modification will increase safety, reduce total pavcment area and provide a space for a raingarden in the southwcst quandrant of the new intersection, The proposed change was discussed with residents at a site visit on November 2, 2002 and was very well received, c. Proposed Drainage/Water Quality Improvements Drainage Overview II I I I I Fernwood Channel System I I I f I A significant amount of discussion and feedback centered around the proposcd drainage improvements and water quality improvcments to be included in the project. Generally the rcsidents requested that the City minimize the amount of pipe to be installed in the project and preferred smaller settling basins incorporated into channels as opposed to ponds thus minimizing the impact to the existing open areas, The consideration of raingardens to reduce runoff from streets was discussed at length, All of these requests have been incorporated into the proposed improvements as outlined in this report, The existing surface drainage patterns for the neighborhood are illustrated in exhibit 10, The eastern half of the neighborhood drains overland and through stonn sewer to the Fernwood Channel tributary to Lake Josephine, The western half of the neighborhood drains to the wetland between Tiller Lane and Ingerson Road and the ditch system adjacent to TH 51. The proposed drainage improvements will maintain existing drainage patterns while incorporating low impact stilling basins and rain gardens to improve water quality as described below: Stonn sewer infrastructure for this drainage system will mimic the existing system with catch basins in Carlton Drive, and Fernwood Street while adding catch basins at the low end of the Ingerson Road hill to more effectively handle rainfall events, The proposed street profile will introduce a new lowpoint on Ingerson Road just west of Ingerson Court, This lowpoint will drain via a pipe under Ingerson Court through the Lake association property to the proposed Fernwood Channel Basin, In order to reduce runoff and promote infiltration, two rain gardens are proposed in this area on either side of Ingerson Court infiltrating runoff from the south gutter of Ingerson Road, The Engineer has reviewed the topography of these areas and discussed the options with the two affected homeowners, Additional meetings with the homeowners will be necessary to finalize the plans, Overflow from these two rain gardens will be clirected to the pipe under Ingerson Court, The proposed storm sewer pipe will be designed as a french drain through the Lake Association property collecting infiltrated water from a surface turf swale above, The proposed Fernwood Channel Basin improvements have been refined over several public meetings and a field visit conducted November 2, 2002 with representatives from the Lake Association and other neighbors, The proposed improvements include the excavation of silt and earth in the northcrn portion of the Fernwood Channel to create a permanent wet basin approximately 4 feet deep (maximum), Selective removal of trees and brush will be required to construct the basin, There is a clump of significant trees in 9