Storm water piping question
Storm water piping question
(OP)
I know if you have an mainline urban pipe system, running/flowing a certain directioning down a highway, SW pipes connecting in from sites should be bearing the same direction, being perpendicular at worst. Is there much tolerance for the tie-in pipes being off-perpendicular in the other direction?
Example: If you have a mainline longitudinal pipe running/flowing east, can you tie in an outfall pipe from a SW pond to the system bearring slightly west, like maybe 10 degrees from being perpendicular?
Example: If you have a mainline longitudinal pipe running/flowing east, can you tie in an outfall pipe from a SW pond to the system bearring slightly west, like maybe 10 degrees from being perpendicular?





RE: Storm water piping question
To correct, if you have the elevation room, you could drop the pond pipe in from the top, not the side. That way the main line would have to be flowing completely full to impede the pond pipe outflow.
RE: Storm water piping question
It would help greatly if you could provide a plan and elevation sketch - hand drawn is OK, scan it in and attach via the link at the bottom of the posting box. Makes it much easier to respond.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Storm water piping question
LittleInch, noted.
RE: Storm water piping question
RE: Storm water piping question
Without a profile, you can no determine if a surcharging sewer (also unknown) would backflow the lateral.
In general, storm sewer alignments between drainage structures (inlets or manholes) shall be straight. The angle of confluence where pipe centerlines intersect shall be 90 degrees or less. In addition, the change in the energy grade line through the junction shall not exceed 3 feet.
Most cities would probably not accept the proposal on a trunk or interceptor sewer.
RE: Storm water piping question
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Storm water piping question
That's the only real solution we found, even though it'll cost a little more. We were trying to avoid tying a SW pond outfall pipe in to a blind junction box downstream in the highway. The nearest visible junction was a curb inlet slightly upstream. But we'll just add a junction box between the outfall box and the pipe mainline to turn it in the proper direction.
RE: Storm water piping question
Richard A. Cornelius, P.E.
WWW.amlinereast.com