11/2015
NT BEA-G6EVO
V3.0
EN
p. 24/58
3.4.3. Building the draining system
Build a drainage system (well) that suits the permeability of the soil (from 200 to 300 mm). In the lower part of the
foundation, add the geotextile lining and fill it with gravel up to about 250 mm in height. The drainage system must be
able to evacuate 20 liters of water in five minutes. Place a section of 100 mm diameter PVC pipe and pour the first
concrete layer.
When the ground is not very permeable, it is best to link the bottom of the excavation to an additional drainage
network/system..
3.4.
3.
Buil
din
g
the
drai
nin
g
syst
em
(Dr
ain
age
pit)
Figure 23: Excavation cut view
Figure 24: Drainage with PVC pipe
Figure 25: First concrete layer
