ᐅ Rainwater infiltration

Created on: 11 Aug 2016 15:33
A
AnjaBro
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.

Textabschnitt erklärt Grundwasser, Versickerungsverhalten und Regenwassersicherung im Baukontext
f-pNo25 Aug 2016 16:51
@RobsonMKK

Objection:
In autumn/winter, my 10 cubic meter (353 cubic feet) tank was also full.
Due to this year’s weather conditions, it took longer before the water was used for irrigation. As a result, the cistern remained full for a long time.
RobsonMKK25 Aug 2016 17:44
@f-pNo okay, okay, I actually wanted to be a bit provocative about community buildings. Basically, water can be used more efficiently than just letting it infiltrate. And using the soakaway (dry well / infiltration trench) as an overflow is a good idea. At least that’s my opinion.
f-pNo25 Aug 2016 18:10
RobsonMKK schrieb:
@f-pNo okay okay, I actually wanted to be provocative about the community center. Basically, water can be used more effectively than just letting it infiltrate. And the soakaway can be used as an overflow. At least that’s my opinion.

I agree with you. However, the cost-benefit factor should not be overlooked here (there have already been several discussions about this). If, however, you are required by regulations not to discharge any water into the sewer system, you inevitably have to ensure that it infiltrates the ground somehow. Even during bad weather summers like this year (referring to the weeks up to mid-July), when in the worst case you might have more of a waterlogged plot than a building site.
RobsonMKK25 Aug 2016 18:27
I am one of the "punished".
A
Alex85
25 Aug 2016 19:30
If you need a cistern for water retention anyway, you should also make use of the water from it, for example by installing a pump. However, installing a cistern solely for irrigation does not seem to be worthwhile, as can be read here in the forum.
RobsonMKK25 Aug 2016 19:57
You usually don’t need a cistern, but rather a soakaway system. However, since that isn’t free either, I can install the cistern in between. This way, I might save tap water for the garden and could also use it for the toilets.