2. Works in connection with watercourses, whether natural or artificial, and their feeders, including—N.I.
(a)the cleansing, widening, deepening, covering or otherwise improving of existing watercourses;
(b)the cutting of new drains where required;
(c)the raising and repairing of existing embankments, and the construction of new embankments;
(d)the sinking of pumping sumps;
(e)the construction and repairing of sluices or valves;
(f)the removal and disposal of old spoil banks.