Any person, firm, corporation or other entity proposing to construct buildings or develop land within any zoning district of the city shall prepare, for approval by the city engineer, a stormwater management plan that describes the manner in which erosion, sediment and runoff resulting from the development will be controlled and managed. No building or construction permits shall be issued by the city and no final plat and no improvement plans for a real estate development in the city shall be approved by the city until the stormwater management plan has been approved by the city engineer as meeting the requirements of this chapter, or the requirement for such stormwater management plan has been waived by the city engineer. Downstream property owners, watercourses, channels or conduits shall not receive stormwater runoff from proposed upstream developments at a higher peak flow rate than would have resulted from the same storm event occurring over the site of the proposed development with the land in its natural, undeveloped conditions, nor shall stormwater runoff exceed  the capacity of the natural drainage system. (Ord. 1320 § 1 (part), 1995: prior code § 5-7-1(B))