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.
305er schrieb:
So, a volume of 3.3m³ (116.5 ft³) was calculated for the basin.It doesn’t matter. Just visit Graf’s website, download the worksheet, fill it out, and send it to Graf. Then you will know what you need and what a Graf infiltration system would cost.
So, I just got a direct offer from Graf, delivered by the specialist dealer for €293.78 (about $320), while it cost me €279.90 (about $305) at OBI, so €13 (about $14) less there.
At OBI, the brand listed is Garantia, but Garantia was actually established by Graf. The product is exactly the same; even on the Graf homepage, when I look up my product and open the installation manual, it mentions Garantia.
So that point is already clarified.
Graf also offered me an additional Universal Filter 3 external... the total comes to €661.81 (about $720) including VAT and delivery.
Compared to the €3300 (about $3600) from the earthworks contractor.
I will also get an offer from Intewa.
I need a total of a 1200L (about 317 gallons) infiltration system.
It consists of a 300L (about 79 gallons) infiltration tunnel, so four pieces in total with a total length of over 4.64m (about 15 feet).
@RobsonMKK ...regarding your statement that infiltration boxes can be built deeper and “igloo” units only horizontally, isn’t that actually not quite correct?
Because this infiltration tunnel is installed horizontally, and an infiltration igloo...
At OBI, the brand listed is Garantia, but Garantia was actually established by Graf. The product is exactly the same; even on the Graf homepage, when I look up my product and open the installation manual, it mentions Garantia.
So that point is already clarified.
Graf also offered me an additional Universal Filter 3 external... the total comes to €661.81 (about $720) including VAT and delivery.
Compared to the €3300 (about $3600) from the earthworks contractor.
I will also get an offer from Intewa.
I need a total of a 1200L (about 317 gallons) infiltration system.
It consists of a 300L (about 79 gallons) infiltration tunnel, so four pieces in total with a total length of over 4.64m (about 15 feet).
@RobsonMKK ...regarding your statement that infiltration boxes can be built deeper and “igloo” units only horizontally, isn’t that actually not quite correct?
Because this infiltration tunnel is installed horizontally, and an infiltration igloo...
I’ll join in here. We are currently facing the same issue. We need to manage about 225 m² (2,422 sq ft) of house roof area and 40 m² (430 sq ft) of garage roof area. Graf recommended their EcoBoxes for this. They are supposed to be cheaper than the tunnels.
In other words, we need to create an infiltration area of 9.6 m x 1.6 m (31.5 ft x 5.2 ft) with a depth of 0.66 m (26 inches). That puts us over 3k with the Graf EcoBoxes. That’s absolutely not affordable. I could get it cheaper with any kind of infiltration basin.
A question for the experts: Is it possible to install two separate infiltration systems? Since we have a large bungalow, we would otherwise have to run piping all the way around the house. It would save me a lot of heavy lifting if I could basically install a system at each corner.
In other words, we need to create an infiltration area of 9.6 m x 1.6 m (31.5 ft x 5.2 ft) with a depth of 0.66 m (26 inches). That puts us over 3k with the Graf EcoBoxes. That’s absolutely not affordable. I could get it cheaper with any kind of infiltration basin.
A question for the experts: Is it possible to install two separate infiltration systems? Since we have a large bungalow, we would otherwise have to run piping all the way around the house. It would save me a lot of heavy lifting if I could basically install a system at each corner.
305er schrieb:
I need a total of a 1200L soakaway I think that’s a bit too small. Our development plan already requires 3 cubic meters. The demand is just under 4.
What exactly do you plan to drain into the 1.2 cubic meters?
305er schrieb:
Regarding your statement that soakaway crates can be built deep while soakaway modules (igloos) only in surface area, isn’t that actually not quite correct? I don’t understand your question. Soakaway modules can only be installed horizontally, how else would that work? With soakaway crates, you can, if necessary, build completely in depth.
Evolith schrieb:
So we have to create a soakaway area of 9.6m x 1.6m with a depth of 0.66m A quick clarification: the excavation must be at least 91cm (36 inches) deep. The soakaway crates themselves are 66cm (26 inches) and must be covered with at least 25cm (10 inches) of soil.
Evolith schrieb:
I can get it cheaper with any swale Not exactly. A swale takes up space on your plot and requires gravel, both of which have a cost.
Of course, the soakaway crates cost a bit more upfront, but they are also underground and don’t interfere with your usable space.
Evolith schrieb:
Can I install two soakaway systems? Yes, you can. However, I would recommend making one soakaway for the house and another for the garage, driveway, and path to the house.
Evolith schrieb:
A question for the experts: Is it possible to install 2 infiltration systems?I have a total of 5... it was easier and cheaper than installing 1 or 2 large ones...