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• <br /> requirements. This project proposes to use a Stormfilter system to address <br /> water quality needs. Based on WWHM4, the system will need to be able to <br /> provide treatment for up to the 2-year, 15-minute outflow from the vault, <br /> which is 0.0259 cfs (11.624 gpm). Assuming the use of the 18" cartridges, 4 <br /> cartridges will be necessary to treat this basin based on sizing information from <br /> Contech. These can be accommodated in a single 60" manhole. For additional <br /> detail, see the project calculations included in Appendix 4-A. <br /> Basin B <br /> In the developed state, Basin B will be comprised of the following coverage: <br /> Coverage Area <br /> C, Lawn, Flat 1.42 acres <br /> Roof, Tops, Flat 1.06 acres <br /> Roads, Flat 1.52 acres <br /> Total 4.00 acres <br /> NGPA Area 0.21 acres <br /> A portion of the site along SR 527 releases undetained due to site grades. The <br /> bypass area breakdown is as follows: <br /> Coverage Area <br /> C, Lawn, Flat 0.25 acres <br /> Roads, Flat 0.07 acres <br /> Total 0.32 acres <br /> The flows from these areas have been included in the calculations, counting <br /> toward the total allowed outflow for Basin B. <br /> A detention vault per Chapter 3, Volume III of the Manual has been proposed to <br /> manage the drainage in this basin. After detention, outflow will be piped to <br /> the existing culvert under 19th Ave. SE where it will outfall into Silver Lake. <br /> July 2014 4-2 LDC Job No. 13-144 <br />