To install 8" water main under-crossing a roadway. If open-trenching is not allowed, is jack-and-bore the best/low-cost method to use? Versus, directional drilling? Are there any known problem areas to this approach? Any good references concerning this method?
We commonly use cement lined ductile iron underground private fire service mains in the fire spinkler industry.
My ref book "The Hydraulics Handbook" published by the Nat'l Fire Sprinkler Assn use a C factor of 140 (Hazen-Williams formula).
Also, reference NFPA 13 Instlln of Spklr Systems, by...
