Warren County 2015 Hazard Mitigation Plan (HMP) An Update to the 2007 Plan May 2015 PREPARED FOR: Warren County, Ohio Prepared by: Michael Baker International | 4100 Horizons Drive, Suite 206 | Columbus, OH Phone: 614-538-7610 | Fax: 614-538-7602| www.mbakerintl.com Table of Contents Section 1. Introduction ........................................................................................................................... 1-1 1.1 Background and Purpose ........................................................................................................... 1-1 1.2 Authority .................................................................................................................................... 1-2 1.3 Plan Organization ....................................................................................................................... 1-2 Section 2. Community Profile ................................................................................................................. 2-1 2.1 Warren County History .............................................................................................................. 2-1 2.2 Geography, Topography, and Climate ....................................................................................... 2-2 2.2.1 Geography .......................................................................................................................... 2-2 2.2.2 Topography ........................................................................................................................ 2-4 2.2.3 Climate ............................................................................................................................... 2-5 2.3 Jurisdictions ................................................................................................................................ 2-5 2.3.1 Village of Butlerville ........................................................................................................... 2-5 2.3.2 City of Carlisle .................................................................................................................... 2-6 2.3.3 Village of Corwin ................................................................................................................ 2-6 2.3.4 City of Franklin ................................................................................................................... 2-7 2.3.5 Village of Harveysburg ....................................................................................................... 2-7 2.3.6 City of Lebanon .................................................................................................................. 2-8 2.3.7 Village of Maineville ........................................................................................................... 2-9 2.3.8 City of Mason ..................................................................................................................... 2-9 2.3.9 Village of Morrow ............................................................................................................ 2-10 2.3.10 Village of Pleasant Plain ................................................................................................... 2-10 2.3.11 Village of South Lebanon ................................................................................................. 2-11 2.3.12 City of Springboro ............................................................................................................ 2-12 2.3.13 Village of Waynesville ...................................................................................................... 2-12 2.4 Socioeconomic Factors ............................................................................................................ 2-13 2.4.1 Population ........................................................................................................................ 2-13 2.4.2 Employment ..................................................................................................................... 2-13 2.4.3 Housing ............................................................................................................................ 2-14 2.5 County Utilities ......................................................................................................................... 2-14 2.5.1 Electric, Telephone and Gas ............................................................................................. 2-14 2.5.2 Water and Wastewater .................................................................................................... 2-14 2.6 Land Use and Future Development Areas ............................................................................... 2-15 2.6.1 Single-Family New House Construction Building Permits ................................................ 2-15 2.6.2 Warren County Comprehensive Plan ............................................................................... 2-16 2.6.3 Future Land Use ............................................................................................................... 2-19 Section 3. What’s New ............................................................................................................................ 3-1 3.1 2007 LHMP and 2015 HMP Update Background ....................................................................... 3-1 3.2 Successful Mitigation Activities Since 2007 ............................................................................... 3-1 3.2.1 Storm Ready Certification .................................................................................................. 3-2 3.2.2 Early Warning Systems ....................................................................................................... 3-2 3.3 What’s New in the HMP Update ................................................................................................ 3-2 Section 4. The Planning Process ............................................................................................................. 4-1 4.1 Planning Process ........................................................................................................................ 4-1 4.2 Organize Resources .................................................................................................................... 4-2 4.2.1 Building the Planning Team ............................................................................................... 4-2 4.2.2 Public Outreach .................................................................................................................. 4-6 4.2.3 Review and Incorporate Existing Information ................................................................... 4-8 4.2.4 Assess Risks ........................................................................................................................ 4-9 4.2.5 Develop Mitigation Plan................................................................................................... 4-10 Section 5. Natural Hazard Risk Assessment ............................................................................................ 5-1 5.1 Identifying the Hazards .............................................................................................................. 5-1 5.2 Hazard Profiles ........................................................................................................................... 5-6 5.3 Extreme Temperatures .............................................................................................................. 5-7 5.3.1 Hazard Identification .......................................................................................................... 5-7 5.3.2 Regulatory Environment .................................................................................................... 5-8 5.3.3 Hazard Events .................................................................................................................... 5-8 5.3.4 Historical Occurrences ....................................................................................................... 5-8 5.3.5 Magnitude/Severity ......................................................................................................... 5-10 5.3.6 Frequency/Probability of Future Occurrences ................................................................ 5-12 5.3.7 Inventory Assets Exposed to Extreme Temperatures ...................................................... 5-13 5.3.8 Potential Losses from Temperature Extremes ................................................................ 5-13 5.3.9 Multi-Jurisdictional Differences ....................................................................................... 5-14 5.3.10 Land Use & Development Trends .................................................................................... 5-14 5.3.11 Temperature Extreme HIRA Summary............................................................................. 5-14 5.4 Winter Storms .......................................................................................................................... 5-16 5.4.1 Hazard Identification ........................................................................................................ 5-16 5.4.2 Regulatory Environment .................................................................................................. 5-17 5.4.3 Hazard Events .................................................................................................................