The City of Youngstown follows Mahoning County Storm Water Management Design Standards. All proposed developments must adhere to sound storm water management practices. A site plan must be submitted to the Engineering Department for review prior to building or zoning permits issued.
1.1 Purpose and Manual Organization
The primary purpose of this manual is to provide detailed and supporting information with examples which will allow developers, designers, contractors, builders and planners the tools necessary to address the sub-division regulations and OEPA permit requirements for both construction site runoff (erosion and sediment control) and post-construction storm water management within Mahoning County.
Post-construction runoff controls are permanent controls which are intended and shall be designed to increase or maintain a receiving stream’s physical, chemical and biological characteristics. In addition, stream functions are maintained and post-construction storm water practices shall provide continued management of both quality and quantity facilities.
Detailed drawings and maintenance plans shall be provided for all post-construction Best Management Practices (BMP’s). Maintenance plans shall also be provided by the permittee to the post-construction operator of the site (including homeowner associations). For sites located within a community with a regulated municipal separate storm sewer system (MS4), the permittee, land owner or other entity with legal control over the property shall be required to develop and implement a maintenance plan to comply with local MS4 requirements. The use of innovative and/or emerging storm water management post-construction technologies shall be at the discretion of the Mahoning County Engineer and could require monitoring to ensure compliance with OEPA’s Construction General Permit (CGP) requirements part III, section G.2.e. The Post-Construction portion of the Storm Water Pollution Prevention Plan shall include the following required elements:
4.4 Recommended Post-Construction Best Management Practices
The following post-construction best management practice controls are identified in OEPA’s CGP and shall be incorporated in project development and design. OEPA has identified six structural BMP’s to be considered and incorporated into storm water management for site development. The Mahoning County Engineer will also consider non-structural practices in combination with these structural practices in reviewing site plans. The Mahoning County Engineer requires supporting documentation of nonstructural BMP estimated pollutant removal information, map of BMP locations on-site, description of BMP type, and frequency with which the BMP will be performed or maintained. Examples of non-structural BMP’s include: site impervious area sweeping, natural buffers, creative mowing practice, etc. The six (6) post-construction structural BMP’s (as presented in the CGP) are addressed below::
The County Engineer will consider alternatives to these structural post-construction BMP’s after all have been considered during the project development process. Supporting rationale as to why they cannot be implemented, designed or incorporated into the site development must be provided. The County Engineer reserves the right to review and recommend alternatives or accept/reject alternatives based on level of maintenance requirements, public health or safety risks, limited water quality benefits and functionality.
Mahoning County Stormwater Brochure
Mahoning County Drainage Criteria and Storm Water Manual
Mahoning County Maintenance and Inspection Requirements Guidance Manual