Protection of below-ground structures against water ingress — Code of practice
This British Standard gives recommendations and provides guidance on methods of dealing with and preventing the entry of water from external sources into structures that are partly or wholly below ground.
It covers the use of:
a) waterproofing barrier materials applied to the structure;
b) structurally integral watertight construction; and
c) drained cavity construction.
It refers to the evaluation of groundwater conditions and consideration of harmful ground gases, as well as risk assessment and management of these risks in below-ground structures.
This British Standard provides guidance on drainage outside the structure and acknowledges the risk of water entering a structure through openings.

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Damas