Provisions shall be made to accommodate effectively the increased runoff caused by changed soil and surface conditions during and after completion of the development. It may be necessary to direct surface water to a drainage ditch, stream, or an existing storm system which has the capacity to carry the flow. No natural drainage course shall be altered and no fill, buildings, nor structures shall be placed in, on, or over it unless provision is made for the flow of water in a manner satisfactory to the County Engineer.
An easement shall be provided to the County Engineer on both sides of an improved surface drainage course that was constructed during development for the purpose of maintaining, and protecting, such stream for drainage and water quality purposes. If the drainage facility is across private property then a right-of-way or Easements must be obtained by the Developer in the name of the County of Summit. These rights-of-way or Easements shall be shown on the Final Plat and the Improvement Plans. A copy of the recorded easement shall be furnished to the County Engineer.
Storm sewer laterals will be provided as directed by the County Engineer for each building on a street having curb and gutter. Rear drainage arrangements shall be placed based upon the topography of the land.
(a) Drainage System Requirements. The drainage system shall be designed per the criteria of the County Engineer Stormwater Management Manual. To ensure proper maintenance of the Stormwater Management System constructed by the Developer, a Long-Term Maintenance Agreement requires a Maintenance Fee obligation pass with the Title to the property. The Maintenance Fee to be assessed is pursuant to O.R.C. Chapters 6131 and 6137 and is determined by the County Engineer. A copy of the Maintenance Agreement Form that is to be completed by the Developer and filed with the Plat is included in the County Engineer Specs and Details.
(b) Road Drainage System. The road storm drainage system shall serve as the local drainage system. It shall be designed to carry roadway, adjacent land, and house storm water drainage. To prevent excessive pipe sizes, storm sewers shall drain into natural waterways as soon as possible.
(c) Storm Sewers, Manholes and Catch Basins.
(1) Where curbs are installed, storm sewers with curb inlets will be required in accordance with the Standard Drawings included in the County Engineer Specs and Details.
(2) Storm sewers or other approved means of erosion control shall be installed in ditches or creeks running through subdivisions where water flow velocity exceeds six (6) feet per second. Storm sewer manhole and inlet basin spacing shall be approved by the County of Summit Engineer. See Pipe Requirements, in County Engineer Specs and Details for approved material for storm sewers. The minimum diameter of storm sewers shall be twelve (12) inches.
(3) The installation of storm sewers, manholes, inlets and catch basins shall conform with the construction in the County Engineer Specs and Details. All storm sewers shall discharge into drainage courses shown on approved drainage drawings or as approved by the County Engineer.
(d) Off-Road Drainage System. The design of the off-road drainage system shall include the watershed affecting the allotment and shall be extended to a watercourse or ditch adequate to receive the storm drainage.
(e) Protection of Drainage Systems. The Developer shall adequately protect all ditches (roadways and watercourses) to the satisfaction of the County Engineer and Summit Soil and Water as shown by calculations made in accordance with the policy of the State of Ohio, Department of Transportation and the subdivision drainage criteria of the County Engineer and all other applicable laws and regulations. In all cases, any drainage facilities within the Subdivision shall be in a stable condition, free from either erosion or sedimentation and/or other debris. Any damage resulting from erosion, scour, silting of drainage ways, or blockage of storm drainage systems on and off the development caused by the construction shall be corrected at the Developer's expense.
(f) Drainage Outlets. All Subdivisions shall have an adequate outlet for storm water. Where the County Engineer finds it necessary to clean, alter, or reconstruct a natural drainage course or storm sewer system outside the development boundary to provide a storm water outlet or to prevent damage to other properties due to an increased runoff, the outlet shall be improved at the expense of the Developer and in accordance with plans and specifications approved by the County Engineer. When it is determined than an adequate outlet does not exist, the Developer shall be required to provide a drainage system to convey runoff from the development area to an approved drainage system.
(g) Drainage Drawings. The Developer's Engineer shall make a complete study of the drainage area contributing to the Subdivision. The Developer will then prepare a plan of the entire Subdivision showing the following:
(1) Existing and proposed contours at two (2) foot intervals.
(2) Proposed streets and lots.
(3) Proposed drainage system showing the area contributing to each pipe or drainage structure.
The Developer's Engineer shall submit copies of all data and calculations sheets to the County Engineer for review and approval.
(Res. 2008-026. Adopted 3-17-08; Ord. 2015-561. Adopted 1-25-16; Ord. 2023-339. Adopted 11-27-23.)