construct end treatment in the wet, how?
construct end treatment in the wet, how?
(OP)
Design calls for a 30" HDPE pipe that outfalls to a storm water pond with a 5:1 side slope. The top of pipe is approximatley 3ft below the control elevation of the pond. The end treatment called for is a cast in place Mitered End Section.
The contractor neglected to install/construct the MES when the pond was dewatered.
Can the MES be installed properly underwater? My biggest concern is not being able to compact the area where the MES will sit.
Any construction suggestions appreciated.
The contractor neglected to install/construct the MES when the pond was dewatered.
Can the MES be installed properly underwater? My biggest concern is not being able to compact the area where the MES will sit.
Any construction suggestions appreciated.





RE: construct end treatment in the wet, how?
RE: construct end treatment in the wet, how?
RE: construct end treatment in the wet, how?
I guess I've gotten into the habit of specifying an end treatment without too much thought to the pipe being submerged or not.
A submerged pipe would not require an end treatment because there would be no erosion issues?
RE: construct end treatment in the wet, how?
- retention of roadway embankment
- improvement of hydraulic efficiency
- protection of highway embankment
- protection against piping
- control if debris
- traffic safety
I'm going to let someone else answer the need for an end mitered to the slope at the outlet of the culvert under submerged condition.
One would tend to think that this is not needed for a 5:1 slope...
RE: construct end treatment in the wet, how?
Is the pond always full? If so, I do not see a need for the end section. If not, then the end section may be warranted and you could wait for dry period and install.
RE: construct end treatment in the wet, how?
I consulted with the project geotech and he had the same suggestion. If it is always submerged leave as is.
Thanks!
RE: construct end treatment in the wet, how?
If I were you I'd leave it as-is, but inspect it in a year or two for scour around the sides of the pipe. If you notice scour forming, throw rip rap in the scour holes of a nominal size equal to the scour hole itself.
Make the recommendation in a letter to the owner and contractor, so they can have that in hand when it comes time to pay for the inspection and possible maintenance later.
my .02
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com