Laserfiche WebLink
• vegetated swale. The other two units will be used as bypass pumps to route all flows above the <br /> two year storm around the swale and into the City's storm sewer. All four pumps will have <br /> identical ratings and power requirements. Bio5ltration will occur in a 162 foot long "emergent <br /> swale," and wi1 provide for a 5 minute residence time as mandated by City standards. The site <br /> hydrogaphs, detention vault design, and swale design calculations can be found in Appendix A of <br /> the supplementsil report. <br /> �hannel Chanae:�,: <br /> No channel changes will be required. <br /> ^ l,,u verts: <br /> An 8'x 10'reinforced concrete single box culvert will be installed for this project to act as a <br /> detention vault for srormwater runoff. Both ends of the culve,rt will be sealed, and a pump station <br /> installed to drain the v�ult. The vault will be located from "L"Line Sta. 2+09.5(27'Lt)to Sta. <br /> 1+19.5(2T Lt). <br /> � Pitches: <br /> No ditches witl be cons:ructed on this project. <br /> Enciosed Draina¢e: <br /> The enclosed drainage system designed for the original Hydrautics Report will not be modified in <br /> this supplement except for the addition of 6" dia. underdrain pipe being added for the swale. In <br /> addition, a portion of the proposed storm sewer from "L" Gne Sta. 2+09.5 to Sta. 1+20.5 will be <br /> removed to construct the detention vault. <br /> Gutter Desi¢n: <br /> Will not be altered from the approved Hydraulic Report. <br /> Retention Ponds: <br /> Retention/detention ponds will not be provided for on this project. . <br /> 3 <br /> _.. .. . _ �' <br />