Hello everyone.
We are facing the following issue with our construction project. According to building regulations, rainwater must be infiltrated on-site or retained within the property. However, according to our soil report, the ground is not suitable for this.
The groundwater level is approximately 3.50 meters (11.5 feet).
Attached is an excerpt from the report.
What options do we have for infiltrating the rainwater? I have already read a lot about soakaway pits, infiltration trenches, and similar solutions, but I am completely unsure.
I look forward to constructive suggestions.
We are facing the following issue with our construction project. According to building regulations, rainwater must be infiltrated on-site or retained within the property. However, according to our soil report, the ground is not suitable for this.
The groundwater level is approximately 3.50 meters (11.5 feet).
Attached is an excerpt from the report.
What options do we have for infiltrating the rainwater? I have already read a lot about soakaway pits, infiltration trenches, and similar solutions, but I am completely unsure.
I look forward to constructive suggestions.
B
Bieber081512 Aug 2016 07:44Well, that's how it goes. Our soil report states:
In fact, we have a cistern with an overflow connected to an infiltration trench.
I'm not exactly sure how to handle this yet (purchase from the developer, and I only received the report at handover, by which time the cistern and infiltration trench were already installed).
Stormwater infiltration according to the specifications of DWA-A-138 is not possible on the property. The loess and glacial till layers present have very low permeability (kf < 1*10^-8 m/s). Ideally, stormwater reuse with an overflow connection to the nearest discharge point is recommended.
In fact, we have a cistern with an overflow connected to an infiltration trench.
I'm not exactly sure how to handle this yet (purchase from the developer, and I only received the report at handover, by which time the cistern and infiltration trench were already installed).
The suggestion of a cistern connected to an infiltration trench has already been made by some other homeowners in the development. I believe this option will also be suitable for us.
The possibility of being exempted from the mandatory infiltration requirement is practically zero.
A connection to the sewage system is technically not planned.
The possibility of being exempted from the mandatory infiltration requirement is practically zero.
A connection to the sewage system is technically not planned.
Bieber0815 schrieb:
Actually, we have a cistern with an overflow into an infiltration trench.Why should the infiltration trench only start working when the cistern is full?!
We only have infiltration trenches. Graf offers infiltration trenches with a 300-liter (79 gallons) capacity, which can simply be connected piece by piece. We have 11 of them. The cost per unit is €50 from the building materials supplier.
The infiltration surface area is huge, and the volume is not exactly small. If you add a cistern in front, you get a large infiltration area plus a big storage tank. Problem solved.
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