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Stormwater Overview

Stormwater Overview. Board of County Commissioners Planning Conference March 1, 2007. Stormwater Ordinance . Required to meet Phase II Regulations Proposed to address secondary and cumulative impacts related to: 12 Mile WWTP expansion to 6 mgd 42-inch water transmission main

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Stormwater Overview

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  1. Stormwater Overview Board of County Commissioners Planning Conference March 1, 2007

  2. Stormwater Ordinance • Required to meet Phase II Regulations • Proposed to address secondary and cumulative impacts related to: • 12 Mile WWTP expansion to 6 mgd • 42-inch water transmission main • 74 ByPass, Carolina Connector • Expected to be required for future projects

  3. Proposed Ordinance • Section I – Stormwater Design Manual • Section II – General Drainage • Includes requirements in Land Use Ordinance • Concentrated flow to adjacent properties • Permanent drainage easement recordation • Section III – Riparian Buffers • Streamside Zone • Undisturbed land along stream channel • Exemptions include limited access and utility crossings, gravity sewer and stormwater bmp’s with no alternative, fences, dam maintenance, stream restoration

  4. Proposed Ordinance • Section III – Riparian Buffers (continued) • Upland Zone • Vegetative land along Streamside Zone • Allowable uses include exemptions from Streamside Zone, storage buildings less than 150 sq ft, limited grading, greenways, recreational equipment

  5. Proposed Ordinance • Section IV – Stormwater Requirements • Applicability: • Cumulatively disturb > 1 acre • Total impervious surface > 20,000 sq ft • Exceed 6% impervious in protected watersheds • Runoff Control • Downstream hydrologic analysis • High Density (exceeds 24% built-upon) control 1-inch rain, discharge equals pre-development rate, 85% TSS removal, post equals pre-development run-off rate for 1, 10, and 25-year storm • Convey upstream drainage assuming build-out conditions • 100-year storm elevations defined

  6. Proposed Ordinance • Section IV – Stormwater Requirements • Final Plat Requirements • Streams, ponds, wetlands, buffers, base flood boundary and elevations • Permanent drainage easements • Statement lot contains stormwater management facility • As-Builts • Annual Inspection Report • Performance Security • Plan Review Fee

  7. Schedule • May 2007 - Presentation to Planning Board • June 2007 – Public Hearing and comment period • August 2007 – Presentation to Board of County Commissioners

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