The Director shall develop, maintain, implement, and enforce such design or engineering standards, as may be required, that is consistent with the Stormwater Management Program and provides a sound technical basis for the achievement of storm water management and water quality objectives.
(a) The Director shall develop and maintain a Stormwater Management Design Manual in accordance with the approved Stormwater Management Program. The Stormwater Management Design Manual shall serve as guidance for the design, construction, and maintenance of facilities which discharge stormwater. The Stormwater Management Design Manual shall be used to assist in the design and evaluation of stormwater management facilities in the County of Greenville. The Stormwater Management Design Manual will include, but not be limited to, guidance in selecting environmentally sound practices for managing stormwater. Description of specific techniques and practices shall be included. Use of techniques emphasizing use of natural systems shall be encouraged.
Best Management Practices (BMPs) can be either structural or non-structural and may be enforced by specific prescription in zoning requirements, subdivision regulations, or on a site-specific basis as may be prescribed to meet Stormwater Management Program objectives. The Stormwater Management Design Manual shall be updated periodically to reflect the most current and effective practices and shall be made available to the public. The Stormwater Management Design Manual is not designed to replace the need for engineering judgment. Other accepted best management practices may be used and will be encouraged if they equal or exceed the performance of practices contained in the Stormwater Management Design Manual and they are approved by the Director.
Although the intention of the Stormwater Management Design Manual is to establish uniform design practices, it neither replaces the need for engineering judgment nor precludes the use of information not presented. Other accepted engineering procedures may be used to conduct hydrologic and hydraulic studies if approved by the Director. The Manual will include, but not be limited to:
a. Guidance and specifications for the preparation of comprehensive Stormwater pollution prevention plans. Acceptable techniques for obtaining, calculating and presenting the information required in the plans shall be described, as will design conditions which must be accounted for;
b. Minimum specifications for designing, constructing, and maintaining Stormwater management facilities. These specifications shall be established in accordance with current good engineering practices;
c. Post-development performance standards for stormwater management facilities and practices. Methodology/criteria for evaluation will include:
1. Hydrologic and hydraulic evaluations;
2. Evaluation of best management practices (BMPs); and
3. Evaluation of downstream impacts.
(b) The Director shall develop and maintain a Best Management Practices (BMP) Field Manual in accordance with the approved Stormwater Management Program. The BMP Field Manual shall serve as a during construction guidance document for inspectors and contractors for the installation, construction, and maintenance of BMPs which discharge stormwater. The BMP Field Manual is not designed to replace the need for engineering judgment. Other acceptable management practices may be used and will be encouraged if they equal or exceed the performance of practices contained in the Stormwater Management Design Manual and they are approved by the Director.
(1976 Code, §§ 8-74—8-76) (Ord. 3551, passed 11-11-2001; Ord. 4281, passed 5-5-2009; Ord. 4698, passed 5-5-2015)