2019-08-14 CC Packet - Laserfiche WebLink

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FEASIBILITY STUDY 4.0STORM SEWER IMPROVEMENTS The existing storm sewer will be replaced and expanded within the project area as necessary to improve drainage conditions. As a result, the amount of runoff that currently discharges directly to Centerville Lake at the west end of Sorel Street will be reduced to the extent possible and rerouted south along Centerville Road to the Lamotte Park stormwater reuse system. The City has been planning for these drainage modifications, and the trunk storm sewer line along the west side of Centerville Road was designed to accommodate this additional drainage. Refer to Figure 7 for the proposed storm sewer improvements. 4.1STORM SEWER SYSTEM EXPANSION Improved storm sewer pipe and structures are needed on Sorel Street and Heritage Street within the project area. These additions will help surface drainage which will in-turn add to the durability of the street surface. Furthermore, future redevelopment will be considered during the design phase such that the new storm sewer system can accommodate the increased runoff. Subsurface drainage improvements are also proposed with the use of drain tile beneath the curb in areas of full street reconstruction. 4.2PROPOSED STORM WATER MANAGEMENT The proposed project area lies within the Rice Creek Watershed District (RCWD). Therefore, the RCWD will have permit authority over the project and the storm water management within the project. In 2011, the City of Centerville implemented a stormwater reuse reclamation system at LaMotte Park. This system was designed with the intent to provide stormwater management credits to offset the impacts of future roadway and redevelopment projects in the downtown area. The majority of the storm water from the proposed project area will be routed to the reuse system. It is anticipated that remaining credits from the Lamotte Park irrigation system will be used to offset stormwater treatment that is required as a result of the proposed improvements. If sufficient credits are not available, the City intends to expand the reuse system as needed. Costs of any expansion to the reuse system are not included in this report. Ultimately, it is the goal that additional on-site stormwater treatment would not be required as part of this project. City of Centerville 2020 Downtown Street and Utility Improvement Project Project No.: 193804758 6 26