Partially Separate System ~ a compromise system † there are two
drains, one to convey only surface water and a combined drain to
convey the total foul discharge and a proportion of the surface
water.
Drainage Systems
Partially Separate System ~ a compromise system † there are two
drains, one to convey only surface water and a combined drain to
convey the total foul discharge and a proportion of the surface
water.
Drainage Systems