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14-3 <br />impacts caused by water erosion and sedimentation have been observed in <br />urban and urbanizing areas, SB have found increased use in those areas. <br />In agricultural settings, SB tend to be separate, single-purpose <br />facilities. However, and as illustrated in case studies presented in <br />Unit 15, a SB may be one part of a multi-purpose stormwater D/R <br />facility. Combining SB with other D/R type facilities is one feature of <br />the more recent use of SB in urban and urbanizing areas. <br />In these multi-purpose applications, the SB is often placed in series <br />_ with and upstream of the D/R facility and is used to remove suspended <br />solids and associated pollutants from frequent stormwater run-off <br />events. The D/R facility is intended primarily to reduce peak <br />downstream flows during infrequent but major stormwater runoff events. <br />Sedimentaticn will occur ui nnst D/R facilities even though they may note <br />be explicitly designed to serve a sedimentation function. Unexpected, <br />sedimentation may have adverse impacts on D/R facilities, such as loss <br />of storage caused by sediment accumulation, unsightly accumulation of <br />suspended solids and other debris near the inlet, and partial <br />obstruction of outlet works, primarily by buoyant debris. Accordingly, <br />designers of D/R facilities should make at least a preliminary <br />assessment of likely sediment loads to the facility, roughly determine <br />probable quantities of sedirt~ent that will be retained by the facility, <br />and identify possible adverse effects of the sedimentation. <br />T~Q6iOtatY nd pn rnun nt Tn~:t lld i-~na <br />A SB may be a temporary measure at a construction or development site <br />