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<br />I <br /> <br />I <br />f <br /> <br />5.4 Chapter 5: Infiltration Trenches <br /> <br />I <br /> <br />DESIGN 1: <br /> <br />I <br /> <br />Median Strip Design (Figure 5.2). This design is frequently used <br />for highway median strips and parking lot "islands't (depressions <br />in between two lots or adjacent sides of one lot). Sheet flow is <br />accepted from both sides of the trench~ and is filtered through a <br />20 foot wide grassed buffer strip. The strip is an integral part <br />of the trench, and should be graded to have a uniform slope not <br />greater than 5%, and should directly abut the contributing <br />impervious area. Berms located on each side of the strip form a <br />shallow depression that temporarily stores runoff before it enters <br />the trench. An overflow pipe is used to pass excess runoff. ' <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Figure 5.2: <br /> <br />Median Strip Trench Design <br /> <br />I <br /> <br />Top View <br /> <br />Side View <br /> <br />Inflow <br /> <br />.. <br /> <br /> <br /> <br />20' GrUB Filter Strip <br /> <br />I <br /> <br />--... <br /> <br />I <br /> <br /> <br />Permeable Filter <br />Fabric One fool <br />Befaw Surface, <br />Traps Debris <br /> <br />I <br /> <br />I <br /> <br />Screened Overflow Pipe <br /> <br />I <br /> <br />-. <br />Oul1low <br /> <br />I <br /> <br />I <br />" <br /> <br />I <br />