2016 024 Ordinance - Laserfiche WebLink

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~` y._.-. CFQVEgi V'JATER:~tiGt~ ~~ PFetiTEt!E~5 May 2016 mitigated within the legal boundaries of the development. Embankment slopes used in compensatory storage areas must reasonably conform to the natural slopes adjacent to the disturbed area. The use of vertical retaining structures is specifically prohibited. 9. Velocit~pation: Velocity dissipation devices shall be placed at discharge locations and along the length of any outfall to provide non-erosive flow velocity from the structure to a water resource so that the natural physical and biological characteristics and functions of the water resource are maintained and protected. C. Stormwater Quality Control: 1. Direct runoff to an SCM: The site shall be designed to direct runoff to one or more of the following SCMs. These practices are listed in Table 2 of this regulation and shall be designed to meet the following general performance standards: a. Extended detention facilities that detain stormwater; settle or filter particulate pollutants; and release the controlled stormwater to a water resource. b. Infiltration facilities that retain stormwater; promote settling, filtering, and biodegradation of pollutants; and infiltrate captured stormwater into the ground. The Village Engineer may require a soil engineering report to be prepared for the site to demonstrate that any proposed infiltration facilities meet these performance standards. For sites less than five (5) acres, but required to create a comprehensive stormwater management plan, the Village Engineer may approve other SCMs if the applicant demonstrates to the Village Engineer's satisfaction that these SCMs meet the objectives of this regulation as stated in Section 1128.09.C.6. c. For sites greater than five (5) acres, or less than five (5) acres but part of a larger common plan of development or sale which will disturb five (5) or more acres, the Village Engineer may approve other SCMs if the applicant demonstrates to the Village Engineer's satisfaction that these SCMs meet the objectives of this regulation as stated in Section 1128.09.C.6, and has prior written approval from the Ohio EPA. d. For the construction of new roads and roadway improvement projects by public entities (i.e. the state, counties, townships, cities, or villages), the Village Engineer may approve SCMs not included in Table 2 of this regulation, but must show compliance with the current version of the Ohio Department of Transportation "Location and Design Manual, Volume Two Drainage Design". 2. Criteria applyin tg o all SCMs. SCMs chosen must be sized to treat the water quality volume (WQv) and to ensure compliance with Ohio Water Quality Standards (OAC Chapter 3745-1). a. The WQv shall be equal to the volume of runoff from a 0.75 inch rainfall event and shall be determined according to one of the following methods: 20