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Infiltration Basins <br />Top View <br />ti <br />Duo <br />e <br />protection ti <br />Flat basin floor with <br />dense grass turf <br />ftiprap settling <br />basin anti <br />level spreader <br />Backup undardrain <br />Emergency spillway <br />Side mew <br />Iva <br />Exffatration storage <br />rM' <br />Pretreated <br />fhorrrtwater <br />Met r <br />Backup widerd in pope in _in of standing water p s <br />Figure 1: Typical Infiltration Basin <br />Source: Schueler, 1987 <br />Iniiet for <br />pretreatar <br />:flora-water <br />• Not appropriate for industrial or commercial sites where the release of large amounts or high concentrations <br />of pollutants are possible <br />• Requires a flat, continuous area <br />• Requires frequent inspection and maintenance <br />Design }" <br />Infiltration basins are generally known to have high failure rates. Such failure rates can be avoided with proper <br />design, taking the following into consideration: <br />• Careful site selection (discussed later, in the Site Sensitivity Analysis section) <br />• Incorporation of pretreatment and a bypass for high -flow events <br />Metropolitan Council / Barr Engineering Co. 3 -157 <br />