ᐅ Stormwater drainage on the property unclear for building permit/planning permission purposes
Created on: 29 Nov 2020 11:57
M
mambo1988
Hello everyone,
We have been waiting for our building permit/planning permission for 8 months, and it seems that only one issue remains to be resolved: rainwater drainage.
The following framework conditions apply:
- According to LANUV, the groundwater level is just below the future turf (+41.80m (137.8 ft))
- Planned ground level +41.95m (137.1 ft)
- Ground floor slab height +42.05m (138.1 ft)
- The existing sewer does not have enough capacity for rainwater. Wastewater is not a problem.
- A soakaway is not possible due to the high groundwater level
- 5 new houses are planned along the street between existing buildings
- Communication is difficult as the solution is being coordinated via the developer.
The following alternatives have been considered:
1. New sewer
- Currently not being pursued, as the solution is probably too expensive
2. For a soakaway, the ground would have to be raised by 1.5m (5 feet). This will likely not be approved by the building authority.
3. Infiltration basin combined with a cistern
- Water from the cistern is intended for use in the toilet and washing machine
- Green roofs are planned for some surfaces. For us, this is only possible on the garage, as we are planning a hipped roof
- We have asked if the infiltration basin can be installed in front of the house. However, it seems it will only be allowed in the garden. For whatever reason?!
Currently, only alternative 3 is being pursued. I have the following questions:
- We have a small plot of 380m² (4,090 sq ft). The infiltration basin is supposed to be installed in the garden. What does this mean for the garden? Will the area be unusable?
- How could the infiltration basin possibly be optimized, beautified, or made usable?
- Why is it apparently not allowed to place the infiltration basin in front of the house?
- What are the disadvantages of using rainwater for the toilet and washing machine?
Are there any other ideas on how rainwater drainage could be realized? I would greatly appreciate any tips!
Thank you very much!
We have been waiting for our building permit/planning permission for 8 months, and it seems that only one issue remains to be resolved: rainwater drainage.
The following framework conditions apply:
- According to LANUV, the groundwater level is just below the future turf (+41.80m (137.8 ft))
- Planned ground level +41.95m (137.1 ft)
- Ground floor slab height +42.05m (138.1 ft)
- The existing sewer does not have enough capacity for rainwater. Wastewater is not a problem.
- A soakaway is not possible due to the high groundwater level
- 5 new houses are planned along the street between existing buildings
- Communication is difficult as the solution is being coordinated via the developer.
The following alternatives have been considered:
1. New sewer
- Currently not being pursued, as the solution is probably too expensive
2. For a soakaway, the ground would have to be raised by 1.5m (5 feet). This will likely not be approved by the building authority.
3. Infiltration basin combined with a cistern
- Water from the cistern is intended for use in the toilet and washing machine
- Green roofs are planned for some surfaces. For us, this is only possible on the garage, as we are planning a hipped roof
- We have asked if the infiltration basin can be installed in front of the house. However, it seems it will only be allowed in the garden. For whatever reason?!
Currently, only alternative 3 is being pursued. I have the following questions:
- We have a small plot of 380m² (4,090 sq ft). The infiltration basin is supposed to be installed in the garden. What does this mean for the garden? Will the area be unusable?
- How could the infiltration basin possibly be optimized, beautified, or made usable?
- Why is it apparently not allowed to place the infiltration basin in front of the house?
- What are the disadvantages of using rainwater for the toilet and washing machine?
Are there any other ideas on how rainwater drainage could be realized? I would greatly appreciate any tips!
Thank you very much!
H
hampshire29 Nov 2020 23:27I am not referring to any specific institution, as I have not conducted detailed research for you. Research and development take place on almost every topic. Special solutions are often found in this context. Many things need to be tested in pilot projects or pilot plants. If I were to conduct research, I would start geographically in the Netherlands, northern Germany, and around the lignite open-pit mining areas.
Are you building with a developer? Then you only gain ownership after acceptance and final payment.
This means the issue is primarily the developer’s responsibility.
Since there are existing houses, the groundwater situation probably isn’t too severe.
Hopefully, you have a contract with completion deadlines. The groundwater conditions are known, so the developer cannot claim force majeure here. They should have anticipated that foundation work and drainage might be more complex.
Discuss the matter with the other affected parties and then put the developer under pressure.
This means the issue is primarily the developer’s responsibility.
Since there are existing houses, the groundwater situation probably isn’t too severe.
Hopefully, you have a contract with completion deadlines. The groundwater conditions are known, so the developer cannot claim force majeure here. They should have anticipated that foundation work and drainage might be more complex.
Discuss the matter with the other affected parties and then put the developer under pressure.
M
mambo198830 Nov 2020 18:19Unfortunately, the property was purchased privately. Until the building permit / planning permission is granted, there are only deadlines that will unfortunately increase the cost of house construction. Therefore, we want to proactively address and advance this topic.
Today, it was decided to develop the following proposal: a cistern, greywater reuse, and an overflow into the active soil zone or a infiltration basin in the rear garden area.
The infiltration basin in particular is causing us headaches. Can it be used for playing? Is only grass allowed there? How else can it be designed?
Here is our property:
Today, it was decided to develop the following proposal: a cistern, greywater reuse, and an overflow into the active soil zone or a infiltration basin in the rear garden area.
The infiltration basin in particular is causing us headaches. Can it be used for playing? Is only grass allowed there? How else can it be designed?
Here is our property:
mambo1988 schrieb:
How could the infiltration basin possibly be optimized/improved/made more usable?You could build a wooden deck on it. The idea of placing the basin close to the house is also nice: creating a rock garden or pond in the basin.Similar topics