Pipe Inverts in relation to ditch bottoms
Pipe Inverts in relation to ditch bottoms
(OP)
Is there any common rule of thumb with setting the elevation of a pipe invert (where the mitred end exists) with relation to the ditch bottom. I've heard many diferent schools of thought on this. Contractors appear to build the ditch bottoms slightly (approx. 2 tenths of a foot) lower than the end of the pipe invert. The problems we've been encountering is that this creates more of a sump than actually directing the water through the sidedrains. I've been told typically you want the ditch bottom slightly higher to actually force the water into the pipe creating somewhat of a "catch" for water to go in. Does anyone get my drift?





RE: Pipe Inverts in relation to ditch bottoms
RE: Pipe Inverts in relation to ditch bottoms
f-d
¡papá gordo ain't no madre flaca!
RE: Pipe Inverts in relation to ditch bottoms
Or, if not using a headwall, perhaps some rip rap outside of the invert extending away from the pipe a few feet. Or a gabion basket filled with rip rap if you are worried about water velocity carrying the rocks away.
I think what tends to happen is contractors don't really compact the disturbed earth outside of the pipe invert, then when it gets wet it settles and makes a bit of a sump.
RE: Pipe Inverts in relation to ditch bottoms
f-d...RCP no Corregated Metal Pipe. If it was CMP, would it be a different call?
RE: Pipe Inverts in relation to ditch bottoms
If you have the reverse, scouring and washing usually occur.