The County of Rankin regulations are compliant with the National Pollutant Discharge Elimination System (NPDES) through municipal regulation Rankin County Stormwater Management Ordinance. The county’s Municipal Separate Storm Sewer System (MS4) requires Rankin to administer and enforce compliance with stormwater discharge permits in an effort to decrease stormwater pollutants and increase overall water quality.
A. No person shall be granted a site development permit for land disturbing activities related to land subdivisions and commercial or industrial development which would require the disturbance of 1-acre or more of land surface without the approval of a Stormwater Management Plan (Section V) by the County Engineer.
B. No person shall be granted a site development permit for land disturbing activities not related to land subdivisions and commercial or industrial development which would require the disturbance of 1-acre or more of land surface without the approval of a Drainage Plan (Section IV) by the Building Official. Such activities will not be subject to the requirements of Sections V and VI of this ordinance except when it is determined by the Building Official, based on a review of the proposed activities and site conditions, that circumstances exist which would warrant further review. In the event the Building Official determines further review is warranted, the Building Official may request review by the County Engineer and may require compliance with all other sections of this ordinance.
C. No site development permit is required for the following activities:
1. Any emergency activity which is immediately necessary for the protection of life, property, or natural resources.
2. Farming and other accepted agricultural uses as permitted in the zoning ordinance provided no sediment will leave the site in and the integrity of the vegetative cover will be maintained.
3. Home gardens, home landscaping, or lawn preparations on existing lots of parcels shall be exempted from the provisions stated herein except where it is determined by the County Engineer or Building Official that the possibility for erosion or alteration of drainage patterns or structures is such to necessitate a site development permit.
4. Upon review and consideration of the potential impacts to water quality from a proposed development or land disturbance activity, the County Engineer, Building Official, and Board of Supervisor collectively may consider granting a waiver of some or all of the requirements set forth in this ordinance in such cases where it is determined the potential for negative impacts to water quality and drainage are minimal. The applicant will be responsible for providing information as may be required by the County Engineer, Building Official, and Board of Supervisors for making a thorough and adequate determination of potential impacts to water quality from a development or land disturbance activity.
The Drainage Plan shall comply with the minimum general requirements set forth in this section. A Drainage Plan will be required for all land disturbance activities that are determined to pose a minimal threat to water quality and are not otherwise covered under Section III, A of this ordinance.
The stormwater management plan shall comply with the minimum general and technical requirements set forth in this Section. The complexity of the plan shall be commensurate with the severity of site conditions and potential for off-site damages. In order to avoid redundancy, the State required Stormwater Pollution Prevention Plan may serve as the Stormwater Management Plan provided the minimum requirements set forth in this Section are adequately addressed. The County Engineer, Building Official, or their designee may require additional information if deemed necessary and appropriate to evaluate the feasibility of the plan. The State’s “Planning and Design Manual for the Control of Erosion, Sediment and Stormwater” and “Stormwater Pollution Prevention Plan (SWPPP) Guidance Manual for Construction Activities” shall be used as a guide when developing the plan. The Stormwater management Plan must specifically address measures for the management of stormwater runoff during construction as well as from the completed development (post-construction). Nonstructural practices for the management of stormwater runoff will take preference over structural practices.
B. Modifications to the plan
1. Major amendments of the stormwater management plan shall be submitted to the County Engineer or Building Official and shall be reviewed and approved, or disapproved, in the same manner as the original plan.
2. Field modifications of a minor nature may be authorized by the County Engineer or Building Official, or their designee, when the approved plan is determined to be ineffective and in need of modification in order to adequately manage stormwater and to comply with the intent of this ordinance.
Grading, erosion control practices, sediment control practices, detention/retention facilities, water quality measures, and waterway crossings shall meet the design criteria set forth in the most recent version of the State’s “Planning and Design Manual for the Control of Erosion, Sediment and Stormwater”, and shall be adequate to prevent transportation of sediment and other potential pollutants from the site to the satisfaction of the County Engineer, Building Official, or their designee.
B. The permitee or his/her agent shall make regular inspections of all control measures in accordance with the inspection schedule outlined in the approved stormwater management plan. The purpose of such inspections will be to determine the overall effectiveness of the plan and the need for additional control measures or maintenance. All inspections shall be documented in written form (may use inspection form provided in the State’s “Stormwater Small Construction General Permit”) upon request of the County Engineer, Building Official, or their designee, and upon completion of site work.
C. The County Engineer, Building Official, or their designee shall enter the site property of the applicant as deemed necessary to make regular inspections to evaluate the effectiveness of stormwater management measures and plan, and to ensure the validity of the reports filed under subsection B of this Section. Permittee is required to provide immediate access to the County Engineer, Building Official, or their designee for the purpose of conducting inspections.
A. It shall be unlawful for any person to allow discharges to the county stormwater runoff conveyance system that are not composed entirely of stormwater runoff and that contribute to increased nonpoint source pollution and degradation of receiving waters.
A. Violation and Penalties
1. In the event that any person holding a site development permit pursuant to this ordinance violates the terms of the permit or implements site development in such a manner as to adversely affect the health, welfare, or safety of persons residing or working in the neighborhood or development site so as to be materially detrimental to the public welfare or injurious to property or improvements in the neighborhood the County Engineer or Building Official may suspend or revoke the site development permit
Rankin County Stormwater Management Ordinance