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After surge analysis of forcemain (510gpm with C-900 CL 150 8-in pvc pipe), we found there will -16.5 ft negative pressure in case pump shuts down. Our analysis showed one 750 gallon surge tank can reduce to -2ft. But we don't want to install any surge tank. What is commonly accepted negative...

What are possible solutions to fix a sag problem without trenching? The problem happened right after construction, but street is already paved. It is 10" PVC sewer gravity line buried under 25-ft deep. Sag is about 2-inch and happened right beside a manhole. Thank you.

I am looking for a specification for steel casing extension for water line under interstate highway. The highway is expanded by two lanes, so agency want to extend its steel casing accordingly. We currently seek for using a split casing to cover existing utility line and welding to existing casing.