1250.17 STORM DRAINAGE SYSTEMS.
   (a)   (1)   Storm sewer shall be designed to flow just full for the five year intensity-duration-frequency storm using the Rational Method. The minimum pavement gutter elevations shall be at or above the hydraulic grade line for twenty-five year frequency storm.
      (2)   For the ten year hydraulic gradient checks, minimum starting point elevation, when a proposed storm drainage system outlets into a nearby stream or ditch, shall be based on ten year high water elevation. If information is unavailable the high water elevation shall be determined by following sound engineering principals subject to approval by the City Engineer.
   (b)   All structures within a new street right-of-way shall be designed to adequately handle the storm drainage of the proposed improvements as determined by the City Engineer.
   (c)   All site development disturbing one acre or more of property shall be required to include on-site storm water detention per the City's current storm water management plan (SWMY). Single-family home construction located on a parcel or parcels is exempt from the detention/retention requirement of this section. The minimum detention volume for the site shall be equivalent to the storage volume produced from a 200 year frequency (post development) storm inflow with an allowable discharge of a five year frequency (pre-developed) storm outflow. The storm water detention calculations for the site shall be submitted with the site grading plans and shall be subject to approval by the City Engineer.
   (d)   All storm water collection systems shall be designed to include, but not limited to, storm water treatment for the removal of sediment. The type of storm water treatment shall be in accordance to the applicable best management practice(s) (BMPS) as listed in the City's current SWMP. All construction and maintenance of storm water collection system shall be in accordance to the Ohio Environmental Protection Agency's Permit No.: OHC000005, or most current permit update. All construction details, involving storm water treatment and maintenance, shall be shown on the erosion control plan for the site, which shall be submitted with the site grading plans subject to review and approval from the City Engineer. All developers or property owners shall maintain any post construction structural BMPS according to the maintenance requirements of said BMP. All post- construction structural BMPS will be inventoried and subject to inspection by the City Zoning Department. Failure to properly maintain the BMP will result in penalties according to subsection (h) hereof.
   (e)   All residential sites and subdivisions shall require all downspouts from gutters to be splashed unto the grass area of the lots a BMP requirement.
   (f)   A storm drainage design plan that includes existing and proposed elevations, storm sewer and pond design and flow directions for all stormwater on site shall be provided for the following:
      (1)   Inground pools;
      (2)   Accessory structures greater than twenty-five square feet; and,
      (3)   All residential building construction on land not within a subdivision.
   (g)   Notification of violation; time limit. Any person found to be violating any provisions of subsection (d) hereof shall be served by the City with a written notice, stating the nature of the violation, sent by first class mail to the person apparently guilty of the violation. This notice shall be deemed sufficient, in the event of violation, if sent to the address of the person shown on the Wood County tax records. The notice shall, in all cases, set forth a time limit during which all noted violations shall cease and be abated, and appropriate corrective action taken, and if the violator shall not thus comply, the provisions of the following paragraph then apply.
   (h)   Violation beyond time limit; penalty. Any person who continues any violation beyond the time limit provided for in subsection (d) hereof is guilty of a minor misdemeanor and shall be punished as provided in Section 698.02 of the General Offenses Code. Every day a person is in violation shall be considered a separate offense.
(Ord. 2011-33. Passed 12-15-11; Ord. 2018-53. Passed 1-24-19; Ord. 2023-05. Passed 2-9-23.)