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Min Clearance between 12" CI clasee 22 water main and storm sewer

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dficker

dficker

Civil/Environmental
Mar 3, 2005
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the perils of storm sewer design in the urban setting:

Whats the absolute minimum clearance between an existing 12" Cast Iron Class 22 water main and storm sewer. The storm sewer will most likely be a 48" inner diameter corrugated plastic pipe. I can get about 6" clear, can I encase the water main or should I encase the storm sewer?
or do I have to reloc the main?

(Btw the diameter specified for the CI pipe is the nominal Inisde Diameter or is the Outside Diameter?
 
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I believe this is a reference to a specific nominal thickness class of gray cast iron pipe formerly produced e.g. to standards ANSI/AWWA C106/A21.6 and C108/A21.8 (see pg 12-5 Historical... information at I think there have been numerous past discussions on these forums concerning requirements per differernt authorities/areas for similar crossings, so you may wish to search the archives using keywords.
 
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