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Stantec CENTERVILLE SURFACE WATER MANAGEMENT PLAN WATER RESOURCE MANAGEMENT PLAN September 2012 6.0 WATER RESOURCE MANAGEMENT PLAN This chapter of the plan provides specific information as to the proposed management framework and methods to meet the water resource management objectives and policies outlined in Chapter 5. The storm sewer and drainage basin map for the City is presented in Figure 8. 6.1 STORM WATER MANAGEMENT AND MAINTENANCE The City experienced significant development in the early to mid- 2000s. While development has slowed considerably the past several years due to the economic downturn, it is likely to pick up again in the future. It is anticipated that development could continue in the City for a number of years into the future until near ultimate population and growth is achieved. Storm water improvements are a requirement of City Code Chapter 157 for new developments. Most new storm sewer constructed in the City will be funded by developers, either directly or through a bonding and assessment process. In accordance with the RCWD Watershed Management Plan and in an effort to protect downstream waters, the City requires that all new developments provide for treatment of storm water discharge. RCWD rules call for infiltration and /or retention of runoff from the 2.8 -inch storm event for new development. For redevelopment, the rules call for infiltration and /or retention of runoff from the 0.8 -inch event. If infiltration is infeasible due to soils that do not support infiltration, documented soil contamination, or a high groundwater tables, then alternative storm water BMPs are required. The RCWD's stated order of preference for these BMPs is biofiltration (e.g., rain gardens), filtration, wetland treatment systems, extended detention basins, and NURP ponding. The RCWD requires protective easements for all storm water detention facilities and conveyance structures. These easements are intended to protect floodplain and storm water storage areas from alterations that may interfere with storage and /or flow of surface water, particularly during flood conditions. They also serve as formal notice to the property owners and future property owners that the and within the easements may be inundated at any future date. Maintenance of storm water facilities will be coordinated with the RCWD. Currently, inspections are performed in the spring and fall, with maintenance done as needed. Maintenance of the current system will continue to be a priority for the City. As new development occurs, developers will "turn over these new storm water facilities to the City Public Works Department, including trunk and lateral storm sewers, catch basins, storm water BMPs, and ponds and outlet structures. With such a relatively new storm sewer system, there are currently few maintenance tasks other than street sweeping, which is done a minimum of once per year. However, the City plans to formulate a Maintenance Plan Budget within 5 years. One Team. Infinite Solutions. 6.14 33