Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Raising the inside floor of a Catch Basin 2" 1

Status
Not open for further replies.
Aggie83

Aggie83

Civil/Environmental
Joined
Jul 23, 2015
Messages
5
Location
US
Hello - this may be very trivial but I have a project in construction where we need to raise the outflow pipe going into an existing 36" precast catch basin (re-routing site storm around a new structure and in order to make up the delta in slope within the system, we are reducing the "drop" within this particular existing catch basin. In order to avoid 2" of standing storm water at the bottom, I was thinking the contractors could grout the bottom up to the invert of the new outflow pipe. Will this work for this application? Is there an industry standard? This is privately-maintained storm drain on a college campus. The District has bare bones construction standards/specifications.

Any help would be appreciated! Thanks!
NR
 
Sort by date Sort by votes
Most standard catch basin designs i've seen include a sump below the outflowing pipe so there is always stormwater standing in the basin. Our standard detail is 24" sump. This gives you a reservoir for sand, gravel, heavy debris, etc... so that routine maintenance can be done by periodically cleaning basin sumps alone... instead of cleaning basins AND the lines between them. Have you considered being 'OK' with the small amount of standing water?

If this was a sanitary sewer manhole (instead of a stormwater catch basin), i would say grout it up.
 
Upvote 0 Downvote
Normally you will need to have a drop or sump of 2-in or more between storm drain inflow and outflow, but in your case i think it should be ok.
This should work fine.
 
Upvote 0 Downvote
Make sure to check your regulations and design criteria for the agency that will approve the design.
 
Upvote 0 Downvote
Where I'm at it's standard to use flowable fill when abandoning structures but lightweight concrete for this type of application. We had to raise the bottom of a manhole 3 ft once and used lightweight concrete. But yes, like the others said with this small of an invert change just leave the sump as is.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

PAB - 1
  • Locked
  • Question Question
Catch basin under surcharge condition
Replies
4
Views
6K
TheEnginerd
TheEnginerd
wesman07
  • Question Question
Help understanding a theory
Replies
6
Views
14K
zelgar
zelgar
Gayle Lewin
  • Locked
  • Question Question
modeling pond with underdrain in to catch basin with weir and orifice plate
Replies
1
Views
690
psmart
psmart
PT60056
  • Locked
  • Question Question
HEC-RAS- culvert modeling- huge jump upstream of culvert
Replies
7
Views
5K
TerryScan
T
Steven Reed P.E.
  • Locked
  • Question Question
Pipe penetration through weephole portion of drywell
Replies
1
Views
8K
SwinnyGG
SwinnyGG

Part and Inventory Search

Sponsor

Back
Top