(a) As used in this chapter:
(i) "Conventional gutters" means curb and gutter or combined sidewalk, curb and gutter;
(ii) "Drains" or "drainage" means all surface sewers, drains, cross street valley gutters and all kinds of draining other than sanitary sewers or conventional gutters;
(iii) "Engineer" means the city engineer, town engineer or any engineer employed by a city or town for local improvement work;
(iv) "Improvement" means any lawful local improvement of any kind, which the governing body finds to be of special benefit to the property proposed to be assessed for the cost thereof;
(v) "Streets" means streets, highways, alleys, roads and public ways.