Hi,
we’re about to start building soon, and the building permit-free process was not objected to.
However, on the advice of the construction manager, we informed the local authority that rainwater would be infiltrated via a soakaway basin in the garden.
The authority states:
Rainwater must be infiltrated; a calculation of the infiltration system according to ATV-DVWK A-138 is required and must be documented. An infiltration test or an equivalent laboratory test is necessary.
We have no expertise in this matter ourselves. I’ve tried to read up a bit, but the whole topic seems very complex.
As mentioned, we specified a soakaway basin, so the local authority was able to approve it directly and did not have to forward it to the lower water authority.
One neighbor in our new development installed a soakaway tank and prefers it over a basin because it doesn’t create a “wet biotope” in the garden.
Another neighbor who has already built (using the same earthworks company/gardening contractor as we are) installed a trench soakaway system.
Now I’m wondering which option is better or more cost-effective?
Attached is the offer, which also includes the trench soakaway.
The soakaway tank seems to be quite a bit cheaper??
I hope you can help me decide the best infiltration method.
we’re about to start building soon, and the building permit-free process was not objected to.
However, on the advice of the construction manager, we informed the local authority that rainwater would be infiltrated via a soakaway basin in the garden.
The authority states:
Rainwater must be infiltrated; a calculation of the infiltration system according to ATV-DVWK A-138 is required and must be documented. An infiltration test or an equivalent laboratory test is necessary.
We have no expertise in this matter ourselves. I’ve tried to read up a bit, but the whole topic seems very complex.
As mentioned, we specified a soakaway basin, so the local authority was able to approve it directly and did not have to forward it to the lower water authority.
One neighbor in our new development installed a soakaway tank and prefers it over a basin because it doesn’t create a “wet biotope” in the garden.
Another neighbor who has already built (using the same earthworks company/gardening contractor as we are) installed a trench soakaway system.
Now I’m wondering which option is better or more cost-effective?
Attached is the offer, which also includes the trench soakaway.
The soakaway tank seems to be quite a bit cheaper??
I hope you can help me decide the best infiltration method.
For me, rainwater is not wastewater. Wastewater is the water coming from the house, and that is connected to the sewer system. This sewer (manhole cover) is actually on our property, so it flows into it anyway.
I don’t see any drainage channels on public roads; rainwater always flows into the sewer.
I don’t see any drainage channels on public roads; rainwater always flows into the sewer.
Mhmmmm, I just chatted with a family who also built a few meters away in our new development and are already living there.
I’ve attached their response.
I don’t quite understand it, I think I really need to go check it out in person.
A soakaway tunnel with 3 rings? That seems to be something completely different from the one by Rewatec, right?
No calculation?
The local water authority wrote to me that they need a calculation according to xxx 138.
The sealed surface above? The lawn isn’t sealed, is it? It’s basically only the roof, right?
Maybe someone with more knowledge can explain what they are trying to tell me ops:
I’ve attached their response.
I don’t quite understand it, I think I really need to go check it out in person.
A soakaway tunnel with 3 rings? That seems to be something completely different from the one by Rewatec, right?
No calculation?
The local water authority wrote to me that they need a calculation according to xxx 138.
The sealed surface above? The lawn isn’t sealed, is it? It’s basically only the roof, right?
Maybe someone with more knowledge can explain what they are trying to tell me ops:
305er schrieb:
Soakaway with 3 rings? That seems to be something completely different than the one from Rewatec or That is probably a concrete infiltration trench (looks similar to a concrete cistern, but it is open at the bottom).
Sealed surfaces basically include everything that is not grass.
I have been trying to explain this all along. If you take another look at Graf’s diagram, you can see all the areas where infiltration occurs:
B
bierkuh8323 Mar 2017 13:20Folks, this isn’t that hard to understand. The municipality is basically only interested in what you let drain from your property into the public sewer system or want to drain into it.
There are basically two options:
a) allowed – with an annual fee depending on the sealed area that drains into the sewer system
b) prohibited
If b), then everything must infiltrate on your own property, including paved surfaces and similar areas.
In that case, there should be a slope away from public pathways, or surface water should be directed by a catchment channel to infiltration areas on your property.
Regarding the calculation… You can send the local water authority the manufacturer’s specifications related to the sealed surface area. It should be acceptable if everything is well documented. They usually have good knowledge of the soil and groundwater levels. What exactly is supposed to happen? You can also ask your geotechnical engineer or geologist about the calculations. It may cost a bit…
There are basically two options:
a) allowed – with an annual fee depending on the sealed area that drains into the sewer system
b) prohibited
If b), then everything must infiltrate on your own property, including paved surfaces and similar areas.
In that case, there should be a slope away from public pathways, or surface water should be directed by a catchment channel to infiltration areas on your property.
Regarding the calculation… You can send the local water authority the manufacturer’s specifications related to the sealed surface area. It should be acceptable if everything is well documented. They usually have good knowledge of the soil and groundwater levels. What exactly is supposed to happen? You can also ask your geotechnical engineer or geologist about the calculations. It may cost a bit…
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