1. Has found it necessary and determined that the public interest, convenience, health, welfare and safety requires that all water generated from individual construction, commercial, industrial, and public use developments and subdivisions be confined and disposed of in a flood control storm drain system; and

2. Has adopted as part of the city's general plan a storm drainage master plan prepared by the city engineer relating to the disposition of surface waters in a storm drainage system; and

3. Has found that each area which is proposed to be subdivided, developed or built upon does in fact generate additional runoff water which needs to be disposed of in a safe manner, avoiding damage and hazards to the inhabitants of the city; and

4. Has found it is necessary that certain improvements be constructed upon or in close proximity to residential, commercial, industrial and public use developments in order to carry the surface runoff water to appropriate storage, disposition areas and other facilities identified in the storm drainage master plan; and

5. Has found that the costs of construction of the improvements must be borne by the developer or builder of the proposed project.