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overflow pipe

A combined sewer is a type of gravity sewer with a system of pipes, tunnels, pump stations etc. to transport sewage and urban runoff together to a sewage treatment plant or disposal site. This means that during rain events, the sewage gets diluted, resulting in higher flowrates at the treatment site. Uncontaminated stormwater simply dilutes sewage, but runoff may dissolve or suspend virtually anything it contacts on roofs, streets, and storage yards.: 296  As rainfall travels over roofs and the ground, it may pick up various contaminants including soil particles and other sediment, heavy metals, organic compounds, animal waste, and oil and grease. Combined sewers may also receive dry weather drainage from landscape irrigation, construction dewatering, and washing buildings and sidewalks.
Combined sewers can cause serious water pollution problems during combined sewer overflow (CSO) events when combined sewage and surface runoff flows exceed the capacity of the sewage treatment plant, or of the maximum flow rate of the system which transmits the combined sources. In instances where exceptionally high surface runoff occurs (such as large rainstorms), the load on individual tributary branches of the sewer system may cause a back-up to a point where raw sewage flows out of input sources such as toilets, causing inhabited buildings to be flooded with a toxic sewage-runoff mixture, incurring massive financial burdens for cleanup and repair. When combined sewer systems experience these higher than normal throughputs, relief systems cause discharges containing human and industrial waste to flow into rivers, streams, or other bodies of water. Such events frequently cause both negative environmental and lifestyle consequences, including beach closures, contaminated shellfish unsafe for consumption, and contamination of drinking water sources, rendering them temporarily unsafe for drinking and requiring boiling before uses such as bathing or washing dishes.Mitigation of combined sewer overflows include sewer separation, CSO storage, expanding sewage treatment capacity, retention basins, screening and disinfection facilities, reducing stormwater flows, green infrastructure and real-time decision support systems.
This type of gravity sewer design is less often used nowadays when constructing new sewer systems. Modern-day sewer designs exclude surface runoff by building sanitary sewers instead, but many older cities and towns continue to operate previously constructed combined sewer systems.

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  1. A

    Bath overflow pipe

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  2. @

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  3. R

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  4. A

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  5. M

    Bending overflow pipe

    Anyone else have success bending overflow pipe in there 22mm bender?
  6. C

    Leaky overflow pipe at loft level but no water tank in my loft.

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  8. N

    Crack in overflow pipe

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  9. P

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  10. D

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    Hi guys, I'll try to describe my issue as best I can but I've attached a video and linked to some images below that might do a better job of explaining. Edit: Just noticed the video didn't upload. I'll try to upload to an external site and pop a link at the bottom when it's done. In the...
  11. G

    Toilet overflow pipe

    Hi I imagine this overflow pipe is now doing nothing now but just want reasured. The toilet suite I ripped out wasn’t connected to anything going outside, and the new one I installed has got a overflow within the cistern. I take it this was connected to the original toilet fitted when the house...
  12. P

    What is causing water to come from overflow pipe

    Hi everyone, I am new to this site so I hope I am posting on the correct forum. I just bought a house with u8nderfloor heating serviced with a Vaillant Echotec plus boiler. It is a pressurised system (no tanks in the loft) but it has a stainless hot water cylinder so it is not a combi boiler...
  13. SimonG

    Overflow Pipe For Condensate Discharge!

    Went to a leaking Worcester Greenstar Heatslave, upstairs and stained the ceiling below. Going in thought I knew exactly what it was, leaking brass Sika flow switch. Bingo, pithing out, new washers and tighten up. Then I heard drip drip drip. Condensate pipe in back corner. Soon as I touched...
  14. J

    Intermittent drip from overflow pipe.

    Hi. I've got an drip that comes and goes from the overflow pipe from the black plastic tank above my boiler, which I think must be the feed/expansion tank. I had a new ball valve fitted by a plumber but still get a drip at times. I don't understand why, if the ball valve is working, there...
  15. C

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    Hi all, I’m hoping for a little help with the below problem. What I believe to be the pressure relief valve exiting out the side of my flat has a constant flow of hot water discharging from it. It is located right next to my boiler although it is boxed in. I am having trouble diagnosing (very...
  16. M

    Overflow pipe from Franke sink to...

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  17. S

    Glow worm 24ci overflow pipe

    Hi, My glow worm boiler seems to be working as normal but I am getting a constant pouring of water outside from the overflow pipe, any ideas what I should check?
  18. K

    Exterior wall wet around overflow pipe with photo

    Hello, As can be seen in photo, there appears to be leak from the overflow pipe on the wall. As the exterior wall is wet could the water be coming out from a leak before it reaches the end of the overflow pipe? Haven't seen any water coming out when flushing, seems to be happening overnight...
  19. D

    water coming out of overflow pipe

    hi. Water has been coming out of my overflow pipe for months. This happens when I've not run the hot water for 4 or 5 hours. I had my ball valve replaced but water was still coming out. I was told by the plumber that it's a hole in the coil in the hot water tank and the copper tank needs...
  20. Eyespy999

    Outdoor insulation for overflow pipe

    evening, I am looking at insulating a plastic overflow pipe 21.5mm? They have some cheap insultion down at wickes but looking at something that will last and not disolve with uv. Any reccomendation please? Cheers!
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