Covington County, Mississippi and Incorporated Areas
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COVINGTON COUNTY, MISSISSIPPI AND INCORPORATED AREAS COMMUNITY NAME COMMUNITY NUMBER COLLINS, CITY OF 280047 COVINGTON COUNTY 280291 (UNINCORPORATED AREAS) MOUNT OLIVE, TOWN OF 280048 COVINGTON COUNTY SEMINARY, VILLAGE OF 280049 EFFECTIVE: Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 28031CV000A NOTICE TO FLOOD INSURANCE STUDY USERS Communities participating in the National Flood Insurance Program (NFIP) have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study (FIS) may not contain all data available within the repository. It is advisable to contact the community repository for any additional data. Part or all of this FIS may be revised and republished at any time. In addition, part of this FIS may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the FIS. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current FIS components. Initial Countywide FIS Effective Date: Revised Countywide FIS Dates: TABLE OF CONTENTS Page 1.0 INTRODUCTION 1 1.1 Purpose of Study 1 1.2 Authority and Acknowledgments 1 1.3 Coordination 2 2.0 AREA STUDIED 3 2.1 Scope of Study 3 2.2 Community Description 4 2.3 Principal Flood Problems 4 2.4 Flood Protection Measures 4 3.0 ENGINEERING METHODS 4 3.1 Hydrologic Analyses 4 3.2 Hydraulic Analyses 6 3.3 Vertical Datum 9 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 9 4.1 Floodplain Boundaries 10 4.2 Floodways 10 5.0 INSURANCE APPLICATIONS 10 6.0 FLOOD INSURANCE RATE MAP 12 7.0 OTHER STUDIES 14 8.0 LOCATION OF DATA 14 9.0 BIBLIOGRAPHY AND REFERENCES 14 i TABLE OF CONTENTS - continued Page TABLES Table 1 - Summary of Discharges 6 Table 2 - Community Map History 13 EXHIBITS Exhibit 1 - Flood Profiles Okatoma Creek Panel 01P-04P Town Creek Panel 05P Town Creek Tributary Panel 06P Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map ii FLOOD INSURANCE STUDY COVINGTON COUNTY, MISSISSIPPI AND INCORPORATED AREAS 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study (FIS) revises and supersedes the FIS reports and/or Flood Insurance Rate Maps (FIRMs) in the geographic area of Covington County, Mississippi, including the City of Collins, the Town of Mount Olive, the Village of Seminary, and unincorporated areas of Covington County (hereinafter referred to collectively as Covington County). This FIS aids in the administration of the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This study has developed flood risk data for various areas of the community that will be used to establish actuarial flood insurance rates. This information will also be used by Covington County to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP), and by local and regional planners to further promote sound land use and floodplain development. Minimum floodplain management requirements for participation in the NFIP are set forth in the Code of Federal Regulations at 44 CFR, 60.3. In some States or communities, floodplain management criteria or regulations may exist that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the State (or other jurisdictional agency) will be able to explain them. 1.2 Authority and Acknowledgments The sources of authority for this FIS report are the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. December 15, 1990, Covington County (Unincorporated Areas) FIS The hydrologic and hydraulic analyses for this study were performed by the U.S. Army Corps of Engineers, Mobile District (the study contractor) for the Federal Emergency Management Agency (FEMA) under Inter-Agency Agreement No. EMW-87-E-2509, Project Order No. 2. This study was completed in February 1988. Additional information for Town Creek, Town Creek Tributary, and Okatoma Creek near the Town of Mount Olive was obtained form the Flood Insurance Study for the Town of Mount Olive. September 15, 1989, Town of Mount Olive FIS The hydrologic and hydraulic analyses for this study were performed by Neel-Schaffer, Inc., (the Study Contractor) for the Federal Emergency Management Agency (FEMA), under Contract No. EMW-86-C-2246. This study was completed in March 1987. This Countywide FIS The hydrologic and hydraulic analyses for this countywide FIS were performed by the State of Mississippi for FEMA, under Contract No. EMA-2006-CA-5617. This study was completed in January 2009. The digital base map information files were provided by the U.S. Army Corps of Engineers—Vicksburg District, 4155 East Clay Street, Vicksburg, MS 39183, phone number (601) 631-5053. The digital orthophotography was acquired in March 2006, with the imagery processed to a 2-foot pixel resolution. The digital FIRM was produced using the Mississippi State Plane Coordinate System, East Zone, FIPSZONE 2301. The horizontal datum was the North American Datum of 1983, GRS 80 spheroid. Distance units were measured in U.S. feet. 1.3 Coordination An initial Consultation Coordination Officer's (CCO) meeting is held with representatives from FEMA, the community, and the study contractor to explain the nature and purpose of a FIS, and to identify the streams to be studied by detailed methods. A final CCO meeting is held with representatives from FEMA, the community, and the study contractor to review the results of the study. December 15, 1990, Covington County (Unincorporated Areas) FIS On September 16, 1986, an initial coordination meeting was held with representatives of FEMA, Covington County, and the study contractor. Coordination has been accomplished with local officials and Federal, State, and regional agencies to secure available data. On January 26, 1990, the results of this Flood Insurance Study were reviewed and accepted at a final coordination meeting attended by representatives of the study contractor, FEMA, and the community. September 15, 1989, Town of Mount Olive FIS On October 19, 1988, the results of this Flood Insurance Study were reviewed and accepted at a final coordination meeting attended by representatives of the Study Contractor, FEMA, and the community. This Countywide Study For this countywide FIS, the Project Scoping Meeting was held on December 5, 2006 in Collins, MS. Attendees for these meetings included representatives from the Mississippi Department of Environmental Quality, Mississippi Emergency Management Agency, FEMA National Service Provider, Covington County, the City of Collins, Pat Harrison Waterway District, the State, and the Study Contractor. Coordination with county officials and Federal, State, and regional agencies produced a variety of information pertaining to floodplain regulations, available community maps, flood history, and other hydrologic data. All problems raised in the meetings have been addressed. 2 2.0 AREA STUDIED 2.1 Scope of Study This FIS covers the geographic area of Covington County, Mississippi, and its incorporated communities listed in Section 1.1 Several flooding sources within the county were studied by approximate methods. Approximate analyses are used to study those areas having a low development potential or minimal flood hazards. The scope and methods of study were proposed to, and agreed upon, by FEMA and the State of Mississippi. December 15, 1990, Covington County (Unincorporated Areas) FIS This Flood Insurance Study covers the unincorporated areas of Covington County, MS. The incorporated areas within the county were excluded from this study. Flooding caused by overflow of Town Creek, Town Creek Tributary, and Okatoma Creek was studied in detail. Areas having low development potential or minimal flood hazards were previously studied using approximate analyses. The results were shown on the Flood Hazard Boundary Map for Covington County, MS (U.S. Housing and Urban Development, 1978) and are incorporated into this Flood Insurance Study. The areas studied were selected with priority given to all known flood hazard areas and areas of projected development or proposed construction through April 1993. The scope and methods of study were proposed to and agreed upon by FEMA and Covington County. September 15, 1989, Town of Mount Olive FIS Flooding caused by overflow of Town Creek, Town Creek Tributary, and Okatoma Creek was studied in detail. Areas having low development potential or minimal flood hazards were studied using approximate analyses. The areas studied were selected with priority given to all known flood hazard areas and areas of projected development or proposed construction through March 1992. The scope and methods of study were proposed to and agreed upon by FEMA and the Town of Mount Olive. This Countywide Study For this countywide FIS, several flooding sources within the county were studied by approximate methods. Approximate analyses are used to study those areas having a low developmental potential or minimal flood hazards. The scope and methods of study were proposed to, and agreed upon, by FEMA and the State of Mississippi. Floodplain boundaries of stream that have been previously studied by detailed methods were redelineated based on best available topographic information. 3 2.2 Community Description Located in southeastern Mississippi, Covington County is bordered on the east by Jones County, MS; on the south by Forrest County, MS; on the west by Jefferson Davis County, MS; and on the north by Simpson and Smith Counties, MS. The county is served by the Canadian National Railroad, U.S. Highways 49 and 84, and State Highways 35, 37, 532, 535, 588, 590, and 598. The estimated 2007 population for Covington County is 20,361 (U.S. Census Bureau, 2008). The climate of Covington County is mild, with an average low of 46.4 oF in January to an average high of 80.7 oF in July.