A. General Requirements: All subdivisions or major partitions shall have adequate provision for storm or flood water runoff channels or basins. The stormwater drainage system shall be separate and independent of any sanitary sewer system. Storm sewers, where required, shall be designed by the Rational Method, or other methods as approved by the City Council and a copy of the design computations shall be submitted along with the plans. Inlets shall be provided so that surface water is not carried across or around any intersection, nor for a distance of more than six hundred feet (600') in the gutter. When calculations indicate that curb capacities are exceeded at a point, no further allowance shall be made for flow beyond that point, and basins shall be used to intercept flow at that point. Surface water drainage patterns shall be shown for each and every lot and block.
B. Nature Of Stormwater Facilities:
1. Location: The applicant may be required to carry away, by pipe or open ditch, any spring or surface water that may exist either previously to or as a result of the subdivision or partition. Such drainage facilities shall be located in the road right-of-way where feasible or in perpetual unobstructed easements of appropriate width and shall be constructed in accordance with the construction standards and specifications recommended by the City Engineer and adopted by the City Council.
2. Accessibility To Public Storm Sewers:
a. 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 stormwaters, subject to the specifications of the City Engineer. However, in subdivisions or partitions containing lots less than fifteen thousand (15,000) square feet in area and in Business and Industrial Districts, underground storm sewer systems shall be constructed throughout the subdivision or partition and be conducted to an approved outfall. Inspection of facilities shall be conducted by the City Engineer.
b. If a connection to a public storm sewer will be provided eventually, the developer shall make arrangements for future stormwater disposal at the time the plat receives final approval. Provision for such connection shall be incorporated by inclusion in the performance bond required for the subdivision plat or partition plat.
3. Accommodation Of Upstream Drainage Areas: 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 subdivision or partition. The City Engineer 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 Comprehensive Plan.
4. Effect On Downstream Drainage Areas: The City Engineer shall also study the effect of each subdivision or partition on existing downstream drainage facilities outside the area of the subdivision or partition. City drainage studies, together with such other studies as shall be appropriate, shall serve as a guide to needed improvements. Where it is anticipated that the additional runoff incident to the development of the subdivision or partition will overload an existing downstream drainage facility, the City Council may withhold approval of the subdivision or partition until provision has been made for the improvement of said potential condition in such a manner as the City Council shall determine. The City Council may require dedication of a water easement or drainage right-of-way where drainage studies indicate it is necessary to protect the area in the subdivision or downstream development. No subdivision or partition shall be approved unless adequate drainage will be provided to an adequate drainage watercourse of facility.
5. Floodplain And Floodway Areas: Floodplain and floodway areas shall be administered according to the City's Flood Area Management Ordinance 1 and Federal and State regulations. All subdivisions shall be developed pursuant to those regulations. The City Council, when it deems necessary for the health, safety or welfare of the present and future population of the area and necessary to the conservation of water, drainage and sanitary facilities, may prohibit the subdivision or partition of any portion of the property which lies within the floodplain or floodway of any stream or drainage course. (Ord. 512-96, 1-8-1996)
Notes
| 1 | 1. See title 13 of this Code. |