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Before introducing the inserts used in the study, it is useful to understand common features of <br />catch basin inserts. A few of these features are listed below, and are sho~~n in the generalized <br />catch basin insert shown in Figure 1. Design features to keep in mind as you read this report <br />include: <br />• A structure which contains the treatment system. <br />• A means of suspending this structure from the drain-inlet frame. <br />• One or more treatment mechanisms which include sedimentation, absorption, filtration, or <br />gravitational. separation of oil and water. <br />• A primary outlet for water which has been treated. <br />• A secondary- or high-flow outlet, through which water which exceeds the treatment capacity <br />of the system may escape. <br />It should be noted that while all of the inserts allow stormwater to exit the system via an overflow <br />when the flow rate exc;,eds the hydrau~c capacity of the treatment area, none of the snits have a <br />true bypass which allows excess water to exit without contacting the treatment area. The <br />significance of this observation will be discussed in later chapters. <br />Inlet Grate <br />I Means of Suspending <br />Treatment System <br />Primary Outlet <br />(Treated Water) <br />Figure 1. Typical Features of a Catch Basin Insert <br />4 <br />