Hello,
Here is the situation: We need a water use permit from the city for our construction project. Due to challenging soil conditions, a soakaway pit is not permitted and has already been rejected (groundwater at approximately 3.0 m (10 feet)).
Our remaining options are:
- A perforated pipe soakaway trench at least 3.5 m (11.5 feet) long with a cross-section of 1 x 1 m (3.3 x 3.3 feet)
- A DN 200 (8 inches) perforated drainage pipe with a storage coefficient of 0.37
(soil replacement is required down to the existing gravel layer)
- An infiltration basin with a volume of 1 m³ (35 cubic feet) per 100 m² (1,076 square feet) of roof area
(which applies to our case)
Since we have no clue which option would be preferable, I would greatly appreciate any information, especially regarding costs. The problem with the basin is that we don’t have a very large garden, but visually it would not be an issue.
Thank you.
Here is the situation: We need a water use permit from the city for our construction project. Due to challenging soil conditions, a soakaway pit is not permitted and has already been rejected (groundwater at approximately 3.0 m (10 feet)).
Our remaining options are:
- A perforated pipe soakaway trench at least 3.5 m (11.5 feet) long with a cross-section of 1 x 1 m (3.3 x 3.3 feet)
- A DN 200 (8 inches) perforated drainage pipe with a storage coefficient of 0.37
(soil replacement is required down to the existing gravel layer)
- An infiltration basin with a volume of 1 m³ (35 cubic feet) per 100 m² (1,076 square feet) of roof area
(which applies to our case)
Since we have no clue which option would be preferable, I would greatly appreciate any information, especially regarding costs. The problem with the basin is that we don’t have a very large garden, but visually it would not be an issue.
Thank you.
G
Gartenfreund28 Sep 2016 05:38A few years ago, we installed a cistern to save on the costs of rainwater disposal. Because of this, the cistern was not allowed to be connected to the drainage system, so we had to figure out how to dispose of excess water on the property. A soakaway was not an option due to the large number of trees and other obstacles in the area. For underground disposal, a permit from the local water authority (in this case, NRW) is required. Requesting permission to find out if this is feasible already costs around 100 €.
However, if the water is allowed to infiltrate the surface, it can be done without a permit. The decision was clear to allow the water to infiltrate on the surface. Simple PVC pipes (HT pipes) were used, with slots cut into them. The pipes were then connected without seals and placed far enough away from the neighboring property. Because the pipes were slotted and no seals were used, they can be rotated to ensure the water flows more or less evenly along the entire length of the pipe. These pipes can be nicely concealed with ivy or other plants.
However, we still need a pump to move the excess water from the cistern into this piping system.
However, if the water is allowed to infiltrate the surface, it can be done without a permit. The decision was clear to allow the water to infiltrate on the surface. Simple PVC pipes (HT pipes) were used, with slots cut into them. The pipes were then connected without seals and placed far enough away from the neighboring property. Because the pipes were slotted and no seals were used, they can be rotated to ensure the water flows more or less evenly along the entire length of the pipe. These pipes can be nicely concealed with ivy or other plants.
However, we still need a pump to move the excess water from the cistern into this piping system.
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