Storm pump station design
Storm pump station design
(OP)
About to design a storm-water detention pump station. Any helpful hints or suggestions about how to match pre-existing condition flow, maintenance of pump station, pump type, how to calculate emergency overflow weir, water quality for first flush or TSS traping eff....
We have a copy of the DOT's Highway Stormwater Pump Station design manual, and we are currently looking into a chopper pump (http://www.chopperpumps.com)- pretty cool pumps. We have a verbal "go-ahead" from the local municipalities now we need to finilize our design keeping in mind maintenance and erosion control.
We started our design sizing our pond with orifices to match the pre-developed flow to determine our pond size, but I know this is not accurate. I am thinking that I will need to compare the outfall pre hydrographs to the pump curves??? We are thinking of using storm filters to keep the grit and sand to a minimum.
To make thigs more complicated, we are adjacent to a wetland. Like all developers, we are trying to fit 10lbs into a 5lb bag and our site is in the lowcountry.
We have a copy of the DOT's Highway Stormwater Pump Station design manual, and we are currently looking into a chopper pump (http://www.chopperpumps.com)- pretty cool pumps. We have a verbal "go-ahead" from the local municipalities now we need to finilize our design keeping in mind maintenance and erosion control.
We started our design sizing our pond with orifices to match the pre-developed flow to determine our pond size, but I know this is not accurate. I am thinking that I will need to compare the outfall pre hydrographs to the pump curves??? We are thinking of using storm filters to keep the grit and sand to a minimum.
To make thigs more complicated, we are adjacent to a wetland. Like all developers, we are trying to fit 10lbs into a 5lb bag and our site is in the lowcountry.
RE: Storm pump station design
RE: Storm pump station design
KRS Services
www.krs-services.com
RE: Storm pump station design
try the above site - Chapter 9.
You may also look at some of the work that has been done in New Orleans area (Jefferson Parish).
http://www.jeffparish.net/pages/index.cfm?DocID=1189
RE: Storm pump station design
Clifford H Laubstein
FL PE 58662
RE: Storm pump station design
This usually happens at the most inopportune time (i.e during the storm when all the debris has flushed through the drains to the pump station.
Have you looked at Hidrostal pumps. We have used them on Stormwater duties & they work really well (they do not block)
RE: Storm pump station design
Do you work for Hidrostal Pump? I noticed that your other posts to this site have all been praising towards Hidrostal. What do you mean by blocking? Why would this happen?
RE: Storm pump station design
No I don't work for Hidrostal pumps, but having spent a number of years in the waste water industry dealing with other pump brands that block/rag when the manufacturers claim otherwise, Hidrostal is the only manufacturer (in my experience) whose pumps do not suffer with blockage problems.
You say that you are looking at Chopper pumps, so I am assuming that this is because you will be seeing debris, rags etc in the Storm Water.
Over in NZ & Australia (where I have worked over the years), many councils will not accept Chopper or Grinder pumps due to the maintenance implications owning one entails.
I have never come across a Chopper pump which can fully macerate all the debris found in sewage or storm water (you may prove me wrong). If a few rags hit the pump suction at the same time, the cutters can't cope & blocking ensues.
They are normally, hydraulically inefficient & once wear takes place in the cutters (you mentioned that some grit will be present), they will be very susceptable to blockages (as they cannot cut properly any more).
This is my experience, I would look forward to hearing other peoples views on this chopper pump subject
Regards,
Berko
RE: Storm pump station design
RE: Storm pump station design
RE: Storm pump station design
We arrived at this by the inflow hydrograph area above a max pump rate that is below the 10 yr storm. Two 5hp pumps in parrallel at this head is around 3.5 ft^3/s, which is also lower than the 2yr pre-developed rate. We currently have a submersible pump wetwell with two pumps.
RE: Storm pump station design
RE: Storm pump station design
They have one filter called the AFR which is self cleaning and can filter down to 2micron. It also fits in a 3ft by 3ft square and can handle high flows.
RE: Storm pump station design
aemery@pumptech.com
ACE003