(A) Preliminary plan and study.
(1) For any property involved in the platting process, the owner shall provide, at his expense, a preliminary drainage study of the area proposed for development.
(2) The preliminary drainage study shall be submitted concurrently with the submittal of a preliminary plat or plat revision.
(3) The studies shall be prepared by an engineer experienced in city drainage work. The studies shall include the date and seal and signature of the engineer responsible for the plan.
(4) The study shall include the following:
(a) Existing topography as required in § 154.023(F).
(b) Flow arrows for existing contours showing the undeveloped flow rates for the 25-year storm.
(c) Existing and proposed drainage facilities both on-site and on adjacent affected properties.
(d) Proposed contours with flow arrows showing the developed flow rates for the 25-year storm.
(e) The scale shall not be smaller than one inch equals 200)feet with contour intervals not greater than five feet unless a variation is specifically approved by the City Engineer or his authorized designee.
(f) Sufficient design calculations showing preliminary sizes of drainage facilities and easements sizes and locations.
(B) Final engineering plans.
(1) The developer shall, at his sole expense, provide complete final engineering plans and specifications for the drainage facilities.
(2) The plans and specifications shall be prepared by an engineer, meeting the qualifications outlined in division (A)(3) above.
(3) The plans and specifications shall be submitted to the City Engineer for review and concurrence prior to any construction. If the plans show any alteration to a regulatory floodway which includes regrading or concrete lining, the developer's engineer shall also submit a study of the hydraulics of the water channel. The study shall contain sufficient information so that the City Engineer can forward the study to FEMA for approval and map revision.
(4) Responsibility for plans and specifications. The owner and his engineer shall be responsible for the accuracy of the information furnished in the design of the storm drainage facilities as it pertains to both the development in question and as the drainage facilities affect properties adjacent to the development. Concurrence in the design by the city shall not be construed to relieve the owner or his engineer of any responsibility referred to herein or impose any liability upon the city or its agents.
(C) Floodplain areas. All development shall conform to this section and the requirements of Chapter 151, Floodplain Management, of this code of ordinances.
('68 Code, App. B, § 7.03) (Ord. 8-1989-34, passed 8-8-89)