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Pike County, Mississippi and Incorporated Areas

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Pike County, Mississippi and Incorporated Areas PIKE COUNTY, MISSISSIPPI AND INCORPORATED AREAS COMMUNITY NAME COMMUNITY NUMBER PIKE COUNTY 280278 (UNINCORPORATED AREAS) MAGNOLIA, TOWN OF 280297 McCOMB, CITY OF 280132 OSYKA, TOWN OF 280258 PIKE COUNTY 1 SUMMIT, TOWN OF 280259 1 NON-FLOODPRONE COMMUNITY EFFECTIVE: Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 28113CV000A 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) report 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 report may be revised and republished at any time. In addition, part of this FIS report 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 report components. Initial Countywide FIS Report Effective Date: Revised Countywide FIS Report 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 5 3.0 ENGINEERING METHODS 5 3.1 Hydrologic Analyses 5 3.2 Hydraulic Analyses 7 3.3 Vertical Datum 10 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 10 4.1 Floodplain Boundaries 11 4.2 Floodways 11 5.0 INSURANCE APPLICATIONS 15 6.0 FLOOD INSURANCE RATE MAP 16 7.0 OTHER STUDIES 18 8.0 LOCATION OF DATA 18 9.0 BIBLIOGRAPHY AND REFERENCES 18 i TABLE OF CONTENTS - continued Page FIGURES Figure 1 - Floodway Schematic 12 TABLES Table 1 - Summary of Discharges 7 Table 2 - Floodway Data 13 Table 3 - Community Map History 17 EXHIBITS Exhibit 1 - Flood Profiles Bogue Chitto Panel 01P Little Tangipahoa River Panel 02P Stream A Panel 03P Tangipahoa River Panel 04P Town Creek Panel 05-06P Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map ii FLOOD INSURANCE STUDY PIKE 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 Pike County, Mississippi, including the Cities of Magnolia and McComb, the Towns of Osyka and Summit, and unincorporated areas of Pike County (hereinafter referred to collectively as Pike 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 Pike 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. September 15, 1989, FIS Pike County (Unincorporated Areas) The hydrologic and hydraulic analyses for this study were performed by the U.S. Geological Survey (USGS) (the Study Contractor) for the Federal Emergency Management Agency (FEMA), under Inter-Agency Agreement No. EMW-85-E-1832. This study was completed in July 1987. February 1979, FIS City of McComb Identification of streams requiring detailed study was made in a meeting attended by representatives of the Federal Insurance Administration (FIA), The City of McComb, and Smith and Sanders, Inc. A notice of intent to perform a flood insurance study was published in the local newspaper on three separate occasions in February and March 1977. Other coordination efforts include meetings and contacts with the Mississippi Research and Development Center, the USGS, the U.S. Army Corp of Engineers (USACE), and the U.S. Soil Conservation Service. On August 1978, the results of the work performed by Smith and Sanders, Inc., was reviewed at a final coordination meeting attended by representatives of the FIA, the City of McComb, and Smith and Sanders, Inc. This Countywide FIS The hydrologic and hydraulic analyses for this countywide FIS were performed by the State of Mississippi for the Federal Emergency Management Agency (FEMA), under Contract No. EMA-2006-CA-5617. This study was completed in November 2008. 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, West Zone, FIPS ZONE 2302. The horizontal datum was the North American Datum of 1983, GRS 1980 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. September 15, 1989, FIS Pike County (Unincorporated Areas) Principal flooding problems for this study were identified at a community meeting held on February 12, 1985. On October 18, 1988, the results of this Flood Insurance Study were reviewed and accepted at a final coordination meeting attended by the representatives of the Study Contractor, FEMA, and the community. February 1979, FIS City of McComb Identification of streams requiring detailed study was made in a meeting attended by representatives of the FIA, the City of McComb, and Smith and Sanders, Inc. A notice of intent to perform a flood insurance study was published in the local newspaper on three separate occasions in February and March 1977. Other coordination efforts include meetings and contacts with the Mississippi Research and Development Center, the U.S. Geological Survey, the U.S. Army Corps of Engineers, and the U.S. Soil Conservation Service. On August 1, 1978, the results of the work performed by Smith and Sanders, Inc., was reviewed at a final coordination meeting attended by representatives of the FIA, the City of McComb, and Smith and Sanders, Inc. 2 This Countywide FIS For this countywide FIS, the Project Scoping Meeting was held on December 4, 2006 in McComb, MS. Attendees for these meetings included representatives from the Mississippi Department of Environmental Quality, Mississippi Emergency Management Agency, FEMA National Service Provider, Pike County, the City of McComb, the Town of Summit, 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. 2.0 AREA STUDIED 2.1 Scope of Study This FIS covers the geographic area of Pike 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. September 15, 1989, FIS Pike County (Unincorporated Areas) For the September 15, 1989, Pike County unincorporated areas, the following streams were studied by detailed methods: Tangipahoa River, Town Creek, and Bogue Chitto. Areas having low development potential or minimal flood hazards were previously studied using approximate methods. The results were shown on the Flood Hazard Boundary Map for Pike County, MS, and were incorporated into this FIS. February 1979, FIS City of McComb For the February 1979, City of McComb FIS, the following streams were studied by detailed methods: Little Tangipahoa River, Stream A, and Town Creek. The areas studied in detail were chosen with consideration given to all forecasted development and proposed construction for a time span of five years through January 1982. Flooding on several smaller streams, where the drainage area was less than one square mile, was studied by approximate methods. This Countywide FIS 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 streams that have been previously studied by detailed methods were redelineated based on best available topographic information. 3 2.2 Community Description Pike County is in southwestern Mississippi on the border of Louisiana. The county is bordered by Tangipahoa and Washington Parishes, Louisiana, on the south, Amite County, Mississippi, on the west, Lincoln County, Mississippi, on the north, and Walthall County, Mississippi, on the east.
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