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INLET <br />16" <br />-1 <br />12" <br />SUGGESTED DIMENSIONS OF <br />SQUARE DROP BOX <br />CONSTRUCTED OF CONCRETE <br />NOTE: ALL OPENINGS ARE CAST <br />AS KNOCKOUTS AND ARE <br />6" DIAMETER OUTSIDE <br />TAPERED TO 5" DIAMETER <br />INSIDE <br />OVER- <br />FLOW <br />OUTLET TO <br />TRENCH <br />-16 <br />121,--- _, <br />DETAIL 10 <br />