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■’ <br />'U- <br />% <br />3. <br />\UL <br />1. <br />2. <br />4. <br />The volume of runoff to these areas will reduce as a result of the <br />development. This is the result of diverting 2.4 acres of drainage to Pond <br />2 and the North Ravine. <br />North Ravine <br />The volume of runoff to Pond 2 and the North Ravine will increase. <br />However, the increased volume will be temporarily stored in Pond 2 and <br />released slowly. The Important aspect of the design in terms of potential <br />impact is that although the volume increases, flow rates are reduced. <br />Conclusions <br />The project exceeds the requirements put forth in MCWD Rule N. <br />The project should not exacerbate capacity issues with downstream <br />stormwater conveyances across, under and along Wildhurst Trail. <br />3.The outlet designs for Ponds 1 and 2 are very restrictive and will reduce <br />existing peak flows. Because they are hydraulically restrictive, the will <br />.Ifalso be susceptible to clogging. If the outlet becomes clogged, it could <br />result in reduced live storage capacity and the likelihood that the ponds <br />will not properly function to control flow rates and/or overflow. Therefore, <br />inspection and maintenance of the ponds is important and should be <br />specifically addressed in a maintenance agreement. <br />The ravine areas are relatively steep and sensitive to erosion. It is <br />recommended that the outfall pipes from the ponds be outfitted with <br />vertical energy dissipaters with sufficient weir length to disperse flow. The <br />immediate area around the energy dissipaters should be treated with <br />riprap to further dissipate flow energy.