mutzbratem
2022-11-02 20:03:24
- #1
Hello forum members :) I am new here in the forum and have an interesting question right away. We are currently building a single-family house near Chemnitz and have to prove 3 cubic meters of retention volume per 100 sqm of sealed surface and discharge 1 l/s. In our case, that means 6000 l retention volume + 4000 l for own use = 10000 l monolithic concrete cistern (drive-overable under the driveway).
Since the street is 50 cm above the property level and I want to drain freely sloping into the cistern, it has to be relatively deep in the ground.
Problem: Now the retention throttle is located below the RW sewer of the street, so I need a lift pump to be able to drain. The overflow is just above the sewer - here there are no problems.
The cistern builder said we should build a lift shaft next to the cistern, where the throttle can discharge at 1 l/s and put a submersible pump with a float switch inside, which then pumps the water into the sewer - honestly ... that’s nonsense. Then the pump keeps switching on, pumps a little with a flow rate > 1 l/s into the sewer and switches off again ... on again ... off again and so on.
My idea was to install a submersible pump with a throttle orifice directly in the cistern, which drains via a hose into the sewer. I would mount the pump at a height between retention volume and storage volume. I don’t need an expensive retention throttle for this, no hole has to be made in the wall, nothing can leak and so on ... only advantages in my opinion.
What do you think about that? Would the wastewater association have any objections? How would or have you solved such a problem? I hope I have expressed myself clearly and someone can chime in here. :)
Kind regards from the Ore Mountains
Since the street is 50 cm above the property level and I want to drain freely sloping into the cistern, it has to be relatively deep in the ground.
Problem: Now the retention throttle is located below the RW sewer of the street, so I need a lift pump to be able to drain. The overflow is just above the sewer - here there are no problems.
The cistern builder said we should build a lift shaft next to the cistern, where the throttle can discharge at 1 l/s and put a submersible pump with a float switch inside, which then pumps the water into the sewer - honestly ... that’s nonsense. Then the pump keeps switching on, pumps a little with a flow rate > 1 l/s into the sewer and switches off again ... on again ... off again and so on.
My idea was to install a submersible pump with a throttle orifice directly in the cistern, which drains via a hose into the sewer. I would mount the pump at a height between retention volume and storage volume. I don’t need an expensive retention throttle for this, no hole has to be made in the wall, nothing can leak and so on ... only advantages in my opinion.
What do you think about that? Would the wastewater association have any objections? How would or have you solved such a problem? I hope I have expressed myself clearly and someone can chime in here. :)
Kind regards from the Ore Mountains