(a) General Requirements. The Planning Commission shall not recommend for approval any development or any plan of subdivision which does not make adequate provisions for storm or flood water runoff channels or basins. The storm water drainage system shall be separate and independent of any sanitary sewer system and in accordance with the standards set forth in the City's Storm Water Management and Erosion and Sedimentation Control Code, 1981. The Storm Water Management and Erosion and Sedimentation Control Plan may be submitted as part of the land development plan.
(1) Storm sewers; bond. Where a public storm sewer is accessible, the applicant shall install storm sewer facilities, or if no outlets are within a reasonable distance, adequate provision shall be made for the disposal of storm waters, subject to the specifications of the City Engineer. However, in subdivisions containing lots less than 15,000 square feet in area and in business and industrial districts, underground storm sewer systems shall be constructed throughout the subdivisions and be conducted to an approved out-fall. Inspection of facilities shall be conducted by the City Engineer prior to connection with the City's storm sewer system. A storm sewer entrance bond shall be obtained from the City Department of Public Works.
(2) Accommodation of upstream drainage area. A culvert or other drainage facility shall in each case be large enough to accommodate potential runoff from its entire upstream drainage area, whether inside or outside the development. The City Engineer for the applicant shall determine the necessary size of the facility, based on the provisions of the construction standards and specifications assuming conditions of maximum potential watershed development permitted by the Zoning Ordinance and shall be reviewed and approved by the City Engineer.
(3) Flood plain districts. Special care should be taken within the Flood Plain Districts to provide for adequate drainage so as to reduce the area's susceptibility and exposure to flood hazards. The system shall provide positive drainage away from buildings.
(b) Dedication of Drainage Easements.
(1) General requirements. When a subdivision is traversed by a watercourse, drainageway, channel or stream there shall be provided a storm water easement or drainage right of way conforming substantially to the lines of such watercourse and of such width and construction on both as shall be adequate for the purpose. Wherever possible it is desirable that the drainage be maintained by open channel with landscaped banks and adequate width for maximum expected volume of flow.
(2) Drainage easements.
A. When topography or other conditions are such as to make impractical the inclusion of drainage facilities within road right of way, perpetual unobstructed easements at least fifteen feet in width for such drainage facilities shall be provided across property outside the road lines and with satisfactory access of the road. Easements shall be indicated on the plan. Drainage easements shall be carried from the road to a natural watercourse or to other drainage facilities.
B. When a proposed drainage system shall carry water across private land outside the development, appropriate drainage rights shall be secured and indicated on the plan.
C. The applicant shall dedicate to the City, either in fee simple or by drainage or conservation easement, land on both sides of existing watercourses, to a minimum width of fifteen feet or as determined by the City Engineer.
D. Low-lying lands along watercourses subject to flooding or overflowing during storm periods, whether or not included in areas for dedication, shall be preserved and retained in their natural state as drainage ways.
(Ord. 12-1982 Sec. 6.40. Passed 11-3-82.)