ᐅ Trench Drain System and Cistern – What Would You Recommend?
Created on: 14 Mar 2018 08:12
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dragonfreakD
dragonfreak14 Mar 2018 08:12Hello,
I am currently working on our drainage system. The city requires the use of rainwater and the infiltration of any excess water.
I am now looking for a shallow trench drainage system and a cistern, both in a low-profile design, as we have a high groundwater level. Can anyone recommend something?
Regards
Christian
I am currently working on our drainage system. The city requires the use of rainwater and the infiltration of any excess water.
I am now looking for a shallow trench drainage system and a cistern, both in a low-profile design, as we have a high groundwater level. Can anyone recommend something?
Regards
Christian
We also have very high groundwater (starting at about 1.6 meters (5 feet 3 inches) in some spots) and have used the "Graf sicker tunnel 300L." You can connect them end-to-end to reach the required area/volume, and when buried 50 cm (20 inches) deep, they are also drivable for vehicles. They cost around €50 each about three years ago. This means you don’t need a cistern or similar system. The inspection shaft directly in front of the soakaway parts is a DN 500 pipe with a bucket at the bottom.
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dragonfreak15 Mar 2018 09:14A cistern is still required due to urban planning regulations .. 😉
But the graphs seem quite common, so that will be it if you are satisfied
But the graphs seem quite common, so that will be it if you are satisfied
How large should the cistern be, and what is its intended purpose?
Are we talking about rainwater harvesting to use it with a pump, for example, for garden irrigation, or are we referring to a collection basin designed to gradually infiltrate the water into the ground?
The first case is unlikely to be a requirement from the authorities, while the second can usually be achieved by having enough alternative volume. The necessary infiltration area/volume for a given surface area is calculated by the responsible engineer (usually the general contractor) when preparing the documents for the building permit/planning permission.
We initially planned a typical shaft for infiltration with a volume of 3.1 cubic meters (3.1 m³ / about 110 cubic feet) and an infiltration area of 1.5 square meters (1.5 m² / about 16 square feet). Unfortunately, this solution was not suitable due to high groundwater levels.
I then wrote a modification request myself and calculated how I would solve the issue now.
I proposed using one Graf tunnel with 300 liters (0.3 m³ / about 10.6 cubic feet) capacity (3.3 m³ / about 116 cubic feet total > 3.1 m³ before) and 11 units of yyy (yyy > 1.5 m², the exact infiltration area is currently unknown). Both new values exceeded the previous ones, so this system will inevitably work. However, the installation is around three to four times larger than before, since the infiltration area is basically the most important factor.
The request was approved immediately at the office. I submitted it in person, and the official said right away that I could proceed this way and the permit would be issued within a few days. Cost: 12 euros from the authority.
Are we talking about rainwater harvesting to use it with a pump, for example, for garden irrigation, or are we referring to a collection basin designed to gradually infiltrate the water into the ground?
The first case is unlikely to be a requirement from the authorities, while the second can usually be achieved by having enough alternative volume. The necessary infiltration area/volume for a given surface area is calculated by the responsible engineer (usually the general contractor) when preparing the documents for the building permit/planning permission.
We initially planned a typical shaft for infiltration with a volume of 3.1 cubic meters (3.1 m³ / about 110 cubic feet) and an infiltration area of 1.5 square meters (1.5 m² / about 16 square feet). Unfortunately, this solution was not suitable due to high groundwater levels.
I then wrote a modification request myself and calculated how I would solve the issue now.
I proposed using one Graf tunnel with 300 liters (0.3 m³ / about 10.6 cubic feet) capacity (3.3 m³ / about 116 cubic feet total > 3.1 m³ before) and 11 units of yyy (yyy > 1.5 m², the exact infiltration area is currently unknown). Both new values exceeded the previous ones, so this system will inevitably work. However, the installation is around three to four times larger than before, since the infiltration area is basically the most important factor.
The request was approved immediately at the office. I submitted it in person, and the official said right away that I could proceed this way and the permit would be issued within a few days. Cost: 12 euros from the authority.
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