I have a question regarding 18" diameter corrugated metal pipe riser used for storm drainage? Does anybody know if there is a limit to the maximum depth for the riser? i.e. the difference between the top of grate/inlet elevation and the bottom elevation where it connects to the storm drain pipe. The riser pipe will be surrounded by dirt all around. I have a situation where the depth of the cmp riser pipe is about 26 feet.
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