1.
drainage 2.draining 3.waterdrain 4.waterdrainage 5.waterdischarge 6.
catchment 7.
drail 8.
dewater 9.unwatering 10.abstractionofwater 11.waterdrainage 12.dischargeofwater 13.
dewatering 14.dischargeofminewater 15.todrainwaterloggedland 16.
bailing