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<br />CHAPTER 6: INFILTRATION BASINS <br /> <br />Infil-cration basins are effective in removing both soluble and fine <br />particulate pollutants borne in urban runoff. Coarse-grained pollutants <br />should generally be removed before they enter a basin. Unlike other <br />infiltration systems, basins can be easily adapted t9' provide full control of <br />peak discharges for large design storms. Also, basins can serve relatively <br />large drainage areas (up to 50 acres). Depending on the degree of <br />storage/exfiltration achieved in the basin, significant groundwater <br />recharge, low flow augmentation and localized streambank erosion control can <br />be achieved. <br /> <br />Figure 6,1: Schematic of an Infiltration Basin <br /> <br />Top View <br /> <br />...- - <br /> <br />~ <br /> <br />- <br /> <br />/ <br /> <br />-----.........- <br /> <br />/ <br /> <br />" <br />\ <br />\ <br />I <br />I <br />/ <br />/ <br />/ <br /> <br />~-.,,~~-..::..~-.,;.:... ..... <br />..;. Embankment ;_~~:~'............ <br />, ( <br />I <br />\ <br />I -<) <br />\ ~ ~ <br />Rip..p _ A- <br />I ~ ::-;: <br /> <br />':~-~-~~::- <br /> <br /> <br /> <br />/ <br /> <br />- <br />.-' <br /> <br />- <br /> <br />- <br /> <br />--- <br /> <br />- <br /> <br />....... <br /> <br />---- <br /> <br />...... <br /> <br />Side View <br /> <br /> <br />Back-up Undsfdraln Pipe in Case of SLBndlng Wahtr Probloms <br /> <br />I <br /> <br />J <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />II <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br /> <br />I <br />