Section 25-55 Drainage and storm sewers.

(a) Flood-prone areas. Any portion of land being subdivided which is located within the limits of maximum flooding of the 100-year flood, as determined by December 1, 1981, flood insurance rate maps and amendments thereto on file with the director of public works, shall be developed so as not to endanger the health, safety and general welfare of the inhabitants thereof, and in compliance with the provisions of the zoning ordinance related thereto.

(b) Storm sewers. Storm sewers with curbs and gutters shall be provided for lots; however, open channels may be allowed where deemed appropriate and when design features, such as vegetated swales and check dams, are used to reduce runoff velocity and allow infiltration. Sidewalks and pedways shall not be located between the street and open channel. Improvements shall conform to standards contained in the city street and storm sewer specifications and design standards, and the city storm drainage standards, and all applicable design standards and specifications now or hereafter promulgated by the director of public works or adopted by the council.

(c) Driveways across drainage features. Driveways that cross drainageways or ditches to connect to public streets shall be constructed in a manner and method approved by the director of public works consistent with the public health, safety and welfare.

(d) Streets crossing streams. Streets that cross streams shall be designed and constructed in a manner that minimizes the disruption to the stream channel and buffer zone. Streams should be crossed only when necessary to connect the street network.