Assignment: Local Mitigation Plan
2015 – 2016 Update
CHARLESTON
REGIONAL HAZARD
MITIGATION PLAN
Jurisdictions Represented and Participating in
the Charleston Regional Hazard Mitigation Plan
Unincorporated Charleston County
Town of Awendaw
City of Charleston
City of Folly Beach
Town of Hollywood
City of Isle of Palms
Town of James Island
Town of Kiawah Island
Town of Lincolnville
Town of McClellanville
Town of Meggett
Town of Mt. Pleasant
City of North Charleston
Town of Ravenel
Town of Rockville
Town of Seabrook Island
Town of Sullivan’s Island
Government Entities Represented and Participating in this Plan
Charleston County Parks & Recreation Commission
Charleston County School District
Charleston Water System
College of Charleston
Cooper River Parks & Playground Commission
James Island Public Service District Commission
Mt. Pleasant Water Works Commission
North Charleston District
North Charleston Sewer District
Roper St. Francis
St. Andrews Parish Park & Recreation Commission
St. Andrews Public Service District
St. John’s Fire District Commission
St. Paul’s Fire District Commission
CONTACT US ABOUT THE PLAN:
The Charleston Regional Hazard Mitigation Plan involves all participating jurisdictions but is
maintained by Charleston County’s Building Inspection Services Department. This plan is
published on the Charleston County Building Inspection Services website and is available in the
department office.
Public comment on the plan is always welcome and incorporated into the yearly updates. For any
questions on the plan or for information on how to be involved with the Plan, please contact
Charleston County Building Inspection Services. Thank you for your interest.
Email: buildingservices@charlestoncounty.org Phone: 843-202-6940
Fax: 843-202-6954
Charleston Regional Hazard Mitigation Plan
Table of Contents Executive Summary ……………………………………………………………………………………………………………. 8
1.1 – Planning Process ……………………………………………………………………………………………………… 8
1.2 – Hazard Assessment …………………………………………………………………………………………………. 9
1.3 – Hazard Identification and Risk Assessment (HIRA) ………………………………………………… 9
1.4 – Problem Assessment ………………………………………………………………………………………………. 10
1.5 – Goals ……………………………………………………………………………………………………………………… 11
1.6 – Review of Possible Activities ………………………………………………………………………………….. 11
1.7 – Adopting Resolution ……………………………………………………………………………………………… 12
1.8 – Action Plan …………………………………………………………………………………………………………….. 12
1.9 – Conclusion …………………………………………………………………………………………………………….. 12
Planning Process ………………………………………………………………………………………………………………. 14
2.1 – Direction of Professional Planner …………………………………………………………………………… 14
2.2 – Pre Planning Request for Input from Interested Parties …………………………………………. 14
2.3 – Planning Committee ………………………………………………………………………………………………. 16
2.4 – Public Input ……………………………………………………………………………………………………………. 18
2.5 – Local Jurisdiction Adoption …………………………………………………………………………………… 20
2.6 – Implementation Plan ……………………………………………………………………………………………… 20
2.7 – Planning Process Summary ……………………………………………………………………………………. 22
Attachment 2-A: Charleston Regional Hazard Mitigation Plan Questionnaire ………………. 26
Attachment 2-B: CRS/Hazard Mitigation Plan Questionnaire Distribution …………………… 33
Attachment 2-C: Members of the Charleston Regional Hazard Mitigation Project
Committee ……………………………………………………………………………………………………………………… 35
Attachment 2-D: Recognizing & Adopting the Committee/Plan …………………………………… 37
Hazard Assessment …………………………………………………………………………………………………………… 39
3.1 – Hurricane ………………………………………………………………………………………………………………. 41
3.2 – Flood ……………………………………………………………………………………………………………………… 46
3.3 – Wildfire ………………………………………………………………………………………………………………….. 50
3.4 – Tornado …………………………………………………………………………………………………………………. 54
3.5 – Earthquake …………………………………………………………………………………………………………….. 57
3.6 – Hazardous Materials ……………………………………………………………………………………………… 61
3.7 – Rip Currents …………………………………………………………………………………………………………… 65
Charleston Regional Hazard Mitigation Plan
3.8 – Severe Storm ………………………………………………………………………………………………………….. 68
3.9 – Drought …………………………………………………………………………………………………………………. 73
3.10 – Winter eather ……………………………………………………………………………………………………….. 78
3.11 – Avian Flu/Pandemic ……………………………………………………………………………………………. 80
3.12 – Dam Failure …………………………………………………………………………………………………………. 83
3.13 – Terrorism ……………………………………………………………………………………………………………… 85
3.14 – Tsunamis ……………………………………………………………………………………………………………… 89
3.15 – Summary of Jurisdictions Affected ………………………………………………………………………. 91
3.16 – Summary of Hazard Extent ………………………………………………………………………………….. 92
3.17 – Summary of Hazard Probability …………………………………………………………………………… 94
Problem Assessment ………………………………………………………………………………………………………… 96
4.1 – Hazard Vulnerability ……………………………………………………………………………………………… 96
4.2 – Vulnerable Buildings ……………………………………………………………………………………………. 112
4.3 – Infrastructure Vulnerability………………………………………………………………………………….. 126
4.4 – Known Flood Damages ………………………………………………………………………………………… 135
4.5 – Past Flood Impacts ……………………………………………………………………………………………….. 137
4.6 – Emergency Warning Needs ………………………………………………………………………………….. 137
4.7 – Critical Facilities …………………………………………………………………………………………………… 140
4.8 – Natural and Beneficial Functions of Floodplains ………………………………………………….. 148
4.9 – Development and Population Trends …………………………………………………………………… 156
4.10 – Economic Impact ………………………………………………………………………………………………… 171
Attachment 4-A: Repetitive Loss Areas within the Charleston Region ………………………… 199
Attachment 4-B: Critical Facilities Located within Charleston County ………………………… 204
Attachment 4-C: Charleston Region Buildings Vulnerable to Flooding Due to Location in
the Special Flood Hazard Area (SFHA) Only ……………………………………………………………….. 213
Attachment 4-D: Charleston Region Buildings Vulnerable to Flooding Due to Year of
Construction and Location in the Special Flood Hazard Area (SFHA) …………………………. 214
Attachment 4-E: Charleston Region Average Valuation of Buildings and Mobile Homes
…………………………………………………………………………………………………………………………………….. 215
Attachment 4-F: Charleston Region Average Valuation of Site-Built Buildings by Flood
Zone …………………………………………………………………………………………………………………………….. 216
Goals ……………………………………………………………………………………………………………………………….. 217
Possible Activities …………………………………………………………………………………………………………… 221
6.1 – Program for Public Information ……………………………………………………………………………. 223
6.2 – Preventive Activities …………………………………………………………………………………………….. 225
Charleston Regional Hazard Mitigation Plan
6.3 – Property Protection ………………………………………………………………………………………………. 227
6.4 – Natural and Beneficial Functions of Floodplains/Resource Preservation …………….. 231
6.5 – Emergency Services ……………………………………………………………………………………………… 233
6.6 – Structural Projects ………………………………………………………………………………………………… 236
6.7 – Public Information Activities ……………………………………………………………………………….. 238
Attachment 6-A: A Chart of Project Prioritization Factors Based Upon Questionnaire
Responses …………………………………………………………………………………………………………………….. 241
Attachment 6-B: A Chart of Property Protection Project Prioritization Based Upon
Questionnaire Responses ……………………………………………………………………………………………… 242
Attachment 6-C: Drainage Improvement Projects ……………………………………………………….. 243
Attachment 6-D: Program for Public Information ……………………………………………………….. 254
Adopting Resolution and Jurisdiction-Specific Action Plans ………………………………………… 259
7.1 – Unincorporated Charleston County ……………………………………………………………………… 261
7.2 – Town of Awendaw ………………………………………………………………………………………………. 287
7.3 – City of Charleston ………………………………………………………………………………………………… 312
7.4 – City of Folly Beach ……………………………………………………………………………………………….. 322
7.5 – Town of Hollywood ……………………………………………………………………………………………… 332
7.6 – City of Isle of Palms ……………………………………………………………………………………………… 357
7.7 – Town of James Island …………………………………………………………………………………………… 364
7.8 – Town of Kiawah Island ………………………………………………………………………………………… 387
7.9 – Town of Lincolnville …………………………………………………………………………………………….. 397
7.10 – Town of McClellanville ………………………………………………………………………………………. 413
7.11 – Town of Meggett ………………………………………………………………………………………………… 427
7.12 – Town of Mt. Pleasant ………………………………………………………………………………………….. 450
7.13 – City of North Charleston…………………………………………………………………………………….. 471
7.14 – Town of Ravenel…………………………………………………………………………………………………. 494
7.15 – Town of Rockville ………………………………………………………………………………………………. 517
7.16 – Town of Seabrook Island ……………………………………………………………………………………. 540
7.17 – Town of Sullivan’s Island …………………………………………………………………………………… 564
7.18 – Charleston County Parks & Recreation Commission ………………………………………….. 577
7.19 – Charleston County School District ……………………………………………………………………… 582
7.20 – Charleston Water System ……………………………………………………………………………………. 588
7.21 – College of Charleston …………………………………………………………………………………………. 604
7.22 – Cooper River Parks & Playground Commission …………………………………………………. 610
Charleston Regional Hazard Mitigation Plan
7.23 – James Island Public Service District Commission ……………………………………………….. 615
7.24 – Mt. Pleasant Water Works Commission ……………………………………………………………… 628
7.25 – North Charleston District …………………………………………………………
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