(A) Storm drainage system.
(1) Every subdivision shall be served by storm drainage facilities, which may include drains, sewer catch basins, culverts, swales, or other facilities.
(2) All drainage facilities shall be so designed to serve the entire drainage area. In major drainage areas, the city, at the option of its appropriate agency, may participate in the cost of certain improvements.
(3) All surface water drainage shall be transported to existing storm sewer or to drainage facilities approved by the Planning Commission.
(4) The Planning Commission and appointed City Engineer shall approve all drainage facilities.
(5) After completion of the streets and utilities, the site shall be cleaned up and graded to drain properly.
(6) The appointed City Engineer shall review and approve all drainage plans, and report his findings to the Planning Commission.
(B) Storm drainage criteria.
(1) Storm drainage for residential areas shall be designed for a ten-year frequency rainfall, and shopping centers and industrial developments for a ten-year frequency.
(2) The drainage system shall be designed and constructed to handle rainfall runoff that originates in or traverses the subdivision.
(3) Street crowns shall not be flattened, or warped from one side of the street to the other for the purpose of causing water flow from one side of the street to the other side, unless specifically approved by the appointed City Engineer.
(4) Water shall be picked up in all streets at least every 600 feet by means of catch basins, drainage pipes or curb and gutter. Unpaved drainage swales or ditches shall be allowed along rear lot lines or in common space where it can be demonstrated to the Planning Commission that surface drainage is adequately accommodated. Where catch basins are located, drainage shall be underground along front or side yard easements or street rights-of-way.
(5) Individual drainage of each lot shall be the responsibility of the individual home builder or lot purchaser. However, it is the responsibility of the developer to provide adequate drainage easements and structures that proper drainage can be effectuated through use of “Turtle Back” lot contours or swales.
(6) No open drainage channels shall be constructed within the area dedicated as public streets and alleys.
(7) As a general policy, a developer shall be required to improve major drainage channels on a prorated basis, based on the percentage of total drainage area contributed by a given development, and its provision for drainage shall also be considered when calculating major drainage improvements.
(8) Whenever drainage ditches are used, such ditches may require concrete or gunite lining, designed to retain their original design characteristics, and designed so they can, at all times, be kept clean and easily maintained.
(Ord. 172, passed 6-8-87)