Subsoil Drainage Systems ~ the lay out of subsoil drains will
depend on whether it is necessary to drain the whole site or if it is
only the substructure of the building which needs to be protected.
The latter is carried out by installing a cut off drain around the
substructure to intercept the flow of water and divert it away
from the site of the building. Junctions in a subsoil drainage system
can be made using standard fittings or by placing the end of the
branch drain onto the crown of the main drain.NB. connections to surface water sewer can be made at inspection
chamber or direct to the sewer using a saddle connector † it may
be necessary to have a catchpit to trap any silt (see page 752).Subsoil Drainage