Since we are currently planning the plumbing, I brought up the topic of backflow preventers. We have three points in the basement where wastewater is discharged outside. For some reason, they didn’t channel everything to one location...
The plumber says that backflow preventers are not planned for our system. Apparently, they are only required if rainwater is also discharged into the sewer system. In our case, this is not allowed, meaning only wastewater goes into the sewer.
Since we are building in a flood-prone area, I believe it is still possible that water could back up through the sewer system.
What do you think? Wouldn’t I need backflow preventers after all?
The plumber says that backflow preventers are not planned for our system. Apparently, they are only required if rainwater is also discharged into the sewer system. In our case, this is not allowed, meaning only wastewater goes into the sewer.
Since we are building in a flood-prone area, I believe it is still possible that water could back up through the sewer system.
What do you think? Wouldn’t I need backflow preventers after all?
B
bierkuh8324 Jan 2018 09:46McEgg schrieb:
Since we are building in a flood-prone area, I think water could still back up through the sewage system. What do you think? Do I still need backwater valves?What would you prefer? Floodwater coming in through the door, or bubbling up from the sump? That’s a rhetorical question.
When discharging rainwater, I think it makes sense to install a backwater valve between the house drainage and the rainwater discharge point to prevent floodwater from pushing back into the building if the pipe is blocked or can’t handle the flow.
But I’m not an expert... Maybe call the local water authority?
Hello again
Yes, exactly like that and only like that is correct, as shown in the sketch.
All drains on the ground floor are above the backflow level.
In the basement, wastewater is discharged above the backflow level using a lifting system.
In the picture, you can see the pipe coming from the pump, which passes over the bend on the ground floor and connects to the wastewater pipe in the basement.
Olli
Yes, exactly like that and only like that is correct, as shown in the sketch.
All drains on the ground floor are above the backflow level.
In the basement, wastewater is discharged above the backflow level using a lifting system.
In the picture, you can see the pipe coming from the pump, which passes over the bend on the ground floor and connects to the wastewater pipe in the basement.
Olli
T
toxicmolotof24 Jan 2018 11:36And as shown in the last diagram, this setup should not be used. In my opinion (as a non-expert), the backwater valve must be installed between the underground drain pipe and the incoming pipes from above.
Otherwise, the bathtub water from the upper floor will flow back out of the drain below when the sewage system is blocked.
Otherwise, the bathtub water from the upper floor will flow back out of the drain below when the sewage system is blocked.
We have a backwater valve installed for the wastewater connections in the basement (washing machine, heating system, floor drain sump, utility sink). This was explained to us as follows: Its purpose is to prevent water from the sewer from backing up into the basement. Up to the height of the lowest window, this is mandatory because insurance companies (almost always) only cover flood damage. Water entering through windows, etc., is considered floodwater. Water coming back through the wastewater pipes is backflow and is usually not insured. With a backwater valve, however, coverage is possible if the maintenance and testing records are properly completed. In the case of serious flooding, you probably have other concerns… Backflow can happen quickly and through no fault of your own.
I don’t really understand it completely now….
@wrobel says the sketch is correct, but @toxicmolotow says it shouldn’t be done that way….
I actually thought it should work like this…. And so far, I haven’t been able to figure out whether a backflow valve is necessary here or not. As a layperson, you naturally assume that the professionals designing the house know what needs to be done. However, I’m not so sure about that…
@wrobel says the sketch is correct, but @toxicmolotow says it shouldn’t be done that way….
I actually thought it should work like this…. And so far, I haven’t been able to figure out whether a backflow valve is necessary here or not. As a layperson, you naturally assume that the professionals designing the house know what needs to be done. However, I’m not so sure about that…
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