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ORAfl particularly those with lower levels. This problem will become more severe if Main street receives a pavement overlay since this will reduce street capacity. Due to several large areas currently undeveloped land, flows under the future condition would be increase significantly. Detention should be provided for all new developments in this basin or improvements made the basins drainage system. A useful improvement would be providing an additional storm drain from Main street to the Blue River in the areas from Lincoln Avenue to Wellington Avenue. In addition, the outlet area of basins would be a good location for a regional water quality control facility. Basin E-6 has adequate conveyance capacity for the existing condition. Future development should be required to provide detention to insure the adequacy of the system. Improvements to Basin E-7 include replacing 18 inch culvert beneath Wellington Avenue with a 24 inch culvert and diverting as much of the flow from the Klack Basin (unit 27) to Basin E-7. This would reduce the flows to the Klack. The Faulkner Kellogg drainage plan had included this improvement. Detention is not a priority in this basin. A drainage easement should be provided at the downstream end of the basin to convey flows to French Creek. Currently, there is no defined drainage once the flow leaves its fully and enters the development along French Creek. This drainage easement and improvements to the drainage should be performed prior to diverting any of the Klack flows into the basin. Water quality is often poor from this drainage due to the steep roadside ditches which collect much of the flow. A regional water quality facility near the mouth of the gully would be very useful. West Side Drainage The west side drainages have a total area of 425 acres. Basin W- I is quite large, having a total area of nearly 180 acres. It encompasses a significant area of undeveloped forrest. Currently, the major drainageway is the ditch along Broken Lance Drive. For floods in excess of the 10-year, this system is inadequate. If this problem is to be solved, it appears the best alternative would be to improve this ditch and the associated culverts. Because of the existing development, there is not a good alternate route. Detention should be incorporated in any future development in this basin. The drainage system for basin W-2 is adequate. Detention is not critical for future development since the impact of development would be minimal. This is also true of Basin W-3. Easements should be obtained to convey the flow to the Blue River. Basin W-4 has an adequate drainage system for both existing and future developed flows. 46