Land which need not be contiguous may be formed into an improvement district for one or more of the following:

1. (a) Irrigation or domestic water service by a system of pumps or conduits or both.
2. (b) Drainage or flood control.
3. (c) Acquisition of existing works incidental to a water distribution system separate from or supplemental to the works of the district.
4. (d) Change or improvement of the water distribution system of the district.
5. (e) Maintenance of irrigation works of the district and works for water supply or drainage or both in or for the improvement district.
6. (f) Control of weeds in or along conduits.