Hello,
In our development area, rainwater from the roof, carport, and driveway must be infiltrated on the property. I originally planned to infiltrate the rainwater using soakaway crates located about 6 meters (20 feet) behind the house at a depth of 70-80 cm (28-31 inches). However, I am having difficulty calculating the capacity of these crates.
Overall, we have approximately 220 m² (2,370 sq ft) of drainage surface area (runoff coefficient taken into account), but I know there are other factors to consider as well. Regardless, has anyone here built a soakaway tunnel for a “typical” single-family home on relatively normal soil conditions, and if so, what size did you use?
Thanks,
Martin
In our development area, rainwater from the roof, carport, and driveway must be infiltrated on the property. I originally planned to infiltrate the rainwater using soakaway crates located about 6 meters (20 feet) behind the house at a depth of 70-80 cm (28-31 inches). However, I am having difficulty calculating the capacity of these crates.
Overall, we have approximately 220 m² (2,370 sq ft) of drainage surface area (runoff coefficient taken into account), but I know there are other factors to consider as well. Regardless, has anyone here built a soakaway tunnel for a “typical” single-family home on relatively normal soil conditions, and if so, what size did you use?
Thanks,
Martin
Baustelle2016 schrieb:
and a 1500 liter (400 gallon) flat tank as a sediment trap Hello,
is such a flat tank always necessary? As a filter/inspection chamber for rainwater?
Thanks!
B
Baustelle201614 Nov 2016 20:56That depends on the local regulations; the responsible authority is the local water protection agency. We built in a drinking water protection zone, so the tank may have been required for that reason. The necessary tank size was unclear for a long time. We built according to the minimum requirement. However, if you have to invest the money anyway, it is worth considering installing a larger cistern. Our neighbors installed a 5 m³ (176 ft³) concrete cistern for less money and appreciate the water supply for lawn irrigation. We also received an offer from the civil engineering contractor – he could have built something for half the price, but after review, it would not have met the regulations. So far, nobody has carried out any inspections – however, the authority requested the drainage plan to be submitted together with the drainage application.
B
Baustelle201614 Nov 2016 21:00We played it safe by providing the architect with the requirements, and he planned the drainage according to the building standards. The sizing was provided by the Graf dealer. For this, a hydrogeological site assessment was necessary, which cost nearly 400€ (approximately 400 euros). However, this was a very reasonable offer compared to the prices discussed here in the forum.
In my opinion, Graf is definitely a good option if you handle it yourself.
Send the data from the already necessary soil survey to Graf, then order the parts online. Prepare the application for the water protection authority, attach the calculation, and submit it.
The tunnels cost around €500 (7m or 8m / 23ft or 26ft) plus the PVC pipes, ventilation, and inspection shaft. Rent an excavator for one day, done.
Send the data from the already necessary soil survey to Graf, then order the parts online. Prepare the application for the water protection authority, attach the calculation, and submit it.
The tunnels cost around €500 (7m or 8m / 23ft or 26ft) plus the PVC pipes, ventilation, and inspection shaft. Rent an excavator for one day, done.
We will proceed exactly like this now. According to Graf’s calculations, we need about 3.5 square meters (37.7 square feet) of soakaway. We will build it ourselves and make it slightly larger. The approval should have been granted with the drainage application, which was submitted together with the building permit/planning permission to the water authority. I once read somewhere that in Germany (NDS), rainwater infiltration systems do not require notification or approval.
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