This plan shows a WSDOT approved PVC alternative to Type 1, Type 1L and Type 2 concrete catch basins. The maximum depth from finished grade to the lowest pipe invert is 8 feet.
PVC structures allow inlet and outlet pipe diameter to match the diameter of the structure with most angles. Riser sections can be trimmed down to 3" of extension without interfering with the ductile iron frame and grate.
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