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14-5 <br />many configurations are possible, most SB will have four basic <br />components: Inlet Control Zone, Settling Zone, Sediment Storage Zone, <br />and Outlet Control Zone. The four components common to most SB are <br />illustrated in Figure 14.2 and each is described in the following: <br />* Inlet Control Zone - The purpose of this component is to <br />intercept incoming flow and distribute it laterally over the <br />SB. The objective is to fully utilize the subsequent settling <br />zone by minimizing short circuiting. Depending on the <br />particular facility, lateral flow distribution may be <br />accomplished with a submerged berm or weir, baffles, or a silt <br />fence. <br />* Settling Zone - Particle settling occurs in the settling zorie, <br />a shallow, relatively tranquil portion of the SS. To further <br />- minimize short circuiting, the settling zone is generally long <br />and narrow, with flow entering and leaving at the opposite, <br />__ narrow ends. Design flow rate, design particle size, and <br />design settling efficiency determine the plan area of the <br />settling zone. <br />* Storage Zone - Positioned beneath the settling zone, the <br />sediment storage zone stores settled solids. The size of tliis <br />zone is a function of the annual sediment load to the SB, L-he <br />trap efficiency of the SB, and the expected frequency of <br />sediment removal. <br />