Improved Open Drainage Courses and Enclosed Drainage Structures.
1. All improvements to open drainage courses and enclosed drainage structures in areas of special flood hazard shall be designed by a registered Professional Engineer in accordance with the City's Drainage Design Criteria, as amended, and constructed to accommodate the base flood event.
a. Upon completion, a registered Professional Engineer shall certify in writing that the improvements made comply with those designed.
b. Improved drainage courses and structures in areas of special flood hazard may be of earthen channel or concrete-lined channel, provided the type of channel used satisfies all applicable design criteria (velocity/type of soil, etc.).
c. The design and construction of improved drainage courses and structures shall provide for adequate access to such drainage courses for the performance of necessary maintenance.
2. All improved drainage courses and structures in areas of special flood hazard meeting the requirements of this ordinance shall be dedicated to the City and accepted for maintenance by the City.
3. The City shall maintain all improved open drainage courses and enclosed drainage structures in areas of special flood hazard provided that the requirements of F Improved Open Drainage Courses and Enclosed Drainage Structures are satisfied. The areas of special flood hazard shall be inspected on an annual basis under the supervision of the City Engineer to determine if required maintenance is being performed. Maintenance shall be performed as often as necessary to keep the area free of debris and any rank growth above the height of 18 inches above the finished grade of the improved drainage course. Inspection for sedimentation shall be conducted as determined by the City Engineer. Maintenance will be performed as often as necessary to keep the sedimentation from exceeding 12 inches in depth above the finished grade of the improved drainage courses. All bottom profile inspections to determine the depth of sedimentation will be coordinated and reviewed by the City Engineer.
See
Subsection 4.06: Flood Damage Prevention Regulations for complete, detailed information.
