Permanent Exclusion ~ this can be defined as the insertion of an
impermeable barrier to stop the flow of water within the ground.
Temporary Exclusion ~ this can be defined as the lowering of the
water table and within the economic depth range of 1„500 can be
achieved by subsoil drainage methods, for deeper treatment a
pump or pumps are usually involved.
Simple Sump Pumping ~ suitable for trench work and/or where
small volumes of water are involved.
Ground Water Control---Temporary Exclusion