Deep drainage structures
Deep drainage structures
(OP)
Looking for design info. for a catch basin/ drop inlet approx. 30 feet deep, feeding a 42" outlet pipe. This is for a quarry reclaimation plan. What kind of info. or standard drawings are out there? I seem to see that most standards limit the height to 10-12 feet. Also, are there any major issues with a water drop of this distance?
Thanks in advance, Herb
Thanks in advance, Herb





RE: Deep drainage structures
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Deep drainage structures
RE: Deep drainage structures
RE: Deep drainage structures
Is there another way to drop the water? (i.e could you install a few sections of sewer and manholes to drop the flow 30').
I would have a few things that come to mind with a direct 30' drop.
1) As gbam and dicksewerrat have outlined, scour would be an issue at the botom of the structure. Especially if you require a 42" outlet. I'm not sure a 3' sump would be enough given the drop.
2) Maintenance access. A 30'drop would require (depending on design standards in your area), 1-2 safety platforms within the structure. I would assume that you would want access given the drop. With the flow that would be entering the structure, you would have to provide a safe access for maintenance staff to the bottom of the structure.
3) Custom Structure Design. The structure that you would be looking for would have to be structurally designed and likley not something that could be obtained via a catalouge. Groundwater pressure, soil pressure, internal forces, etc would come into play with a structure like this.
4) Outlet. There would be quite a bit of turbulence at the bottom of the structure, it may also be beneficial to look further at the 42" outlet for erosion and scour d/s.
Hope this helps.
RE: Deep drainage structures
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Deep drainage structures
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Deep drainage structures
I've seen vortex drop structures for sanitary applications, which may work for this. May be something to look into.
RE: Deep drainage structures