POTABLE WATER MAIN CONSTRUCTION
POTABLE WATER MAIN CONSTRUCTION
(OP)
I HAVE TO DESIGN A WATER MAIN UNDER A ROAD THAT HAS DRAINAGE SWALES IN BOTH SIDES. THE SWALES ARE KIND OF DEEP. THE BOTTOM OF THE SWALE IS ABOUT 5 FEET BELLOW THE ROAD CENTERLINE ELEVATION. SHOULD I DESIGN THE WATER MAIN STRAIGHT FROM THE BOTTOM TO THE BOTTOM OF THE DITCHES OR SHOULD I GO ALONG WITH THE TERRAIN PROFILE. IF I GO STRAIGHT FROM BOTTOM TO BOTTOM THE WATER MAIN WILL BE CONSTRUCTED 7 FEET BELLOW THE ROAD GRADE, OTHERWISE I COULD KEEP THE STARDARD 3-FOOT BELLOW THE GRADE ELEVATION. THE WATER TABLE ELEVATION IS ON THE BOTTOM OF THE SWALE AND THE SOIL IS WELL DRAINED SAND. I AM NOT SURE IF ALL FITTINGS THAT I WILL SAVE CONSTRUCTING THE WATER MAIN STRAIGHT WILL COMPENSATE FOR THE DEEPER TRENCH THAT I WILL HAVE TO DIG AND MANAGE DURING THE WORK.... THE TOTAL LENGTH OF THE CROSSING IS +- 140 FEET.
I APPRECIATE ANY COMMENT OR ADVISE. THANKS
I APPRECIATE ANY COMMENT OR ADVISE. THANKS





RE: POTABLE WATER MAIN CONSTRUCTION
RE: POTABLE WATER MAIN CONSTRUCTION
I really appreciate your advice... Thanks
RE: POTABLE WATER MAIN CONSTRUCTION
RE: POTABLE WATER MAIN CONSTRUCTION
RE: POTABLE WATER MAIN CONSTRUCTION
I agree with mikolay whenever possible. There are situations when using bends or offsets are unavoidable. How long is the main? How much cover is required over the water main? If you install the main 7' deep, do you come back up to a higher elevation with the rest of the main? I just finished a project where I crossed a state road. In 80' of 12" watermain, we had 5 conflicts. Fiber optic and elect. and communication banks, a 48" storm drain and a 96" raw water main. At our tie in point to the existing water main we had 4 feet of cover. When we finally got pass all the conflicts we got back on grade, 4' from top of pipe to finish elevation grade. We used 45' bends and offsets to accomplish this installation rodded and thrustblocks. I installed ARV's at every high point. This profile looked unbelieveable. Remember, trapped air in the main makes holding a steady required psi for testing very difficult. Good luck