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<br />OR~f1 <br /> <br />The existing drainage system in Basin W-5 is adequate for flood <br />flows. There are some problems with ice buildup in the 18 inch RCP <br />along the upper set of unit 1. This is due to a combination of <br />shallow cover, a flat section of pipe, and introduction of small <br />ground water flows. The most important consideration in this basin <br />is to require detention for future developments since the 100-year <br />flood could be nearly doubled, and render the existing storm drain <br />inadequate. It might be possible to incorporate a regional <br />detention facility at the downstream end of the storm drain. This <br />would be feasible if the area adjacent to the Blue River were <br />lowered during development of the river corridor and adjacent land. <br /> <br />The drainage system for Basin W-6 is adequate for existing <br />conditions and could convey future developed flows, if the inlet <br />to the 42 inch RCP is properly accounted for in future development. <br />However, considering that the 100-year discharge would increase <br />from 30 cfs to 80 cfs and that the 2-year discharge would increase <br />from 3 cfs to 25 cfs under full development, detention should be <br />provided for to prevent introducing much larger concentrated flows <br />from causing erosion. <br /> <br />The assessment of Basin W-7 is similar to W-6. The current <br />drainage system is adequate for both existing and future developed <br />flows, but due to the possible magnitude of increase for future <br />flows and water quality concerns, detention should be required of <br />all future development in the basin. <br /> <br />47 <br />