Hello everyone,
our building regulations require surface water infiltration. According to calculations from our paver, we will likely need:
1) 80 m² (860 sq ft) with a detention depth of 30 cm (12 inches)
or
2) 25 m² (270 sq ft) with a detention depth of 100 cm (39 inches)
I understand this to mean that I can either have a "wide, shallow" infiltration basin or a "narrow, deep" basin. Is that correct?
If I choose the "deep" option (to avoid losing too much lawn area), could I practically create a planting bed there (with plants that can tolerate occasional wet feet) and use it as an infiltration basin? Does anyone have experience with this?
I also read that the basin must be at least 3 m (10 ft) away from the property boundary. Does this apply on all sides (including where I don’t have neighbors, such as the street side)?
Regards,
VK
our building regulations require surface water infiltration. According to calculations from our paver, we will likely need:
1) 80 m² (860 sq ft) with a detention depth of 30 cm (12 inches)
or
2) 25 m² (270 sq ft) with a detention depth of 100 cm (39 inches)
I understand this to mean that I can either have a "wide, shallow" infiltration basin or a "narrow, deep" basin. Is that correct?
If I choose the "deep" option (to avoid losing too much lawn area), could I practically create a planting bed there (with plants that can tolerate occasional wet feet) and use it as an infiltration basin? Does anyone have experience with this?
I also read that the basin must be at least 3 m (10 ft) away from the property boundary. Does this apply on all sides (including where I don’t have neighbors, such as the street side)?
Regards,
VK
H
hampshire26 Apr 2020 20:39The depression blends in naturally with good landscaping. 30cm (12 inches) is not much, and the area is only about 27sqm (290 sqft). It hardly stands out.
Vicky Pedia schrieb:
That's 30m³ (about 1060 cubic feet). Where is so much water supposed to come from during a rain event?That's right, just recalculated, it's theoretically 8cm (3 inches). In practice, it's 30cm (12 inches) because the water from the cistern overflow doesn't flow uphill.G
Gartenfreund27 Apr 2020 07:04I would install a cistern underground and then use the rainwater to irrigate the garden. If the cistern gets too full, simply distribute the excess water around the garden using a pump. This was done here as well to save on stormwater fees. When everything is done as a DIY project, it is also not very expensive, depending on the size of the cistern.
H
hampshire27 Apr 2020 08:30@Gartenfreund : The cistern is a great idea – however, the basin still needs to be constructed by the original poster, as it is a requirement.
V
VolkerRacho27 Apr 2020 21:041) If I understand the calculation correctly, I have to choose between LARGE and SHALLOW (30cm deep, 80m² (860 sq ft)) or SMALL and DEEP (1m deep, 25m² (270 sq ft) wide). That’s my problem. If I have an 80m² (860 sq ft) wide depression in the lawn, wouldn’t that look uneven and awkward?
2) A cistern only helps to a limited extent. When it’s full, the water still has to be infiltrated somehow...
The calculated values seem to be based on the sealed surface area. The quote mentions something like “Determined infiltration area according to DWA A138.” Whatever that means.
2) A cistern only helps to a limited extent. When it’s full, the water still has to be infiltrated somehow...
The calculated values seem to be based on the sealed surface area. The quote mentions something like “Determined infiltration area according to DWA A138.” Whatever that means.
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