GIBSON COUNTY, INDIANA - IN.gov county gibson county, indiana and incorporated areas community community name number *fort branch, town of 180452

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  • Gibson County

    GIBSON COUNTY, INDIANA AND INCORPORATED AREAS

    COMMUNITY COMMUNITY NAME NUMBER *FORT BRANCH, TOWN OF 180452 FRANCISCO, TOWN OF 180336 GIBSON COUNTY

    (Unincorporated Areas) 180434 *HAUBSTADT, TOWN OF 185252 HAZLETON, TOWN OF 180327 *MACKEY, TOWN OF 185251 *OAKLAND, CITY OF 180072 *OWENSVILLE, TOWN OF 185253 PATOKA, TOWN OF 180340 PRINCETON, CITY OF 180073 *SOMERVILLE, TOWN OF 185250 *No Special Flood Hazard Area

    PRELIMINARY:

    Federal Emergency Management Agency

    FLOOD INSURANCE STUDY NUMBER

    18051CV000A

  • NOTICE TO FLOOD INSURANCE STUDY USERS

    Communities participating in the National Flood Insurance Program 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 Community Map Repository. Please

    contact the Community Map Repository for any additional data.

    The Federal Emergency Management Agency (FEMA) may revise and republish part or all of this

    FIS report at any time. In addition, FEMA may revise part of this FIS report by the Letter of Map

    Revision process, which does not involve republication or redistribution of the FIS report. Therefore,

    users should consult with community officials and check the Community Map Repository to obtain

    the most current FIS report components.

    Selected Flood Insurance Rate Map panels for this community contain information that was

    previously shown separately on the corresponding Flood Boundary and Floodway Map panels (e.g.,

    floodways, cross sections). In addition, former flood hazard zone designations have been changed as

    follows:

    Old Zone: New Zone:

    A1 through A30 AE

    B X

    C X

    Initial Countywide FIS Effective Date: To be Determined

  • i

    TABLE OF CONTENTS

    Page

    1.0 INTRODUCTION 1

    1.1 Purpose of Study 1

    1.2 Authority and Acknowledgments 2

    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 5

    2.4 Flood Protection Measures 6

    3.0 ENGINEERING METHODS 7

    3.1 Hydrologic Analyses 7

    3.2 Hydraulic Analyses 8

    3.3 Vertical Datum 10

    4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 10

    4.1 Floodplain Boundaries 11

    4.2 Floodways 11

    5.0 INSURANCE APPLICATION 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

    FIGURES

    Figure 1 - Floodway Schematic 13

  • ii

    TABLES

    Table 1 Scope of Study 4

    Table 2 Population of Incorporated Cities and Towns in Gibson County 5

    Table 3 - Flood Crest Elevations (Pigeon Creek near Fort Branch) 5

    Table 4 Flood Crest Elevations (White River at Hazleton) 6

    Table 5 Flood Crest Elevations (Patoka River near Princeton) 6

    Table 6 Summary of Discharges 7

    Table 7 Channel and Overbank Roughness Factors 9

    Table 8 Floodway Data Table 14

    Table 9 Community Map History 17

    EXHIBITS

    Exhibit 1 - Flood Profiles Panel #s

    Brown Ditch Panels 01P-02P

    McCarty Ditch Panels 03P-04P

    Richland Creek Panels 05P-06P

    Exhibit 2 - Flood Insurance Rate Map Index

    Flood Insurance Rate Map

  • 1

    FLOOD INSURANCE STUDY

    GIBSON COUNTY, INDIANA AND INCORPORATED AREAS

    1.0 INTRODUCTION

    1.1 Purpose of Study

    This Flood Insurance Study (FIS) revises and supersedes the FIS reports and Flood

    Insurance Rate Maps (FIRMs) in the geographic area of Gibson County, Indiana,

    including the Cities of Princeton and Oakland, the Towns of Fort Branch, Francisco,

    Haubstadt, Hazleton, Mackey, Owensville, Patoka, and Somerville, and the

    unincorporated areas of Gibson County (hereinafter referred to collectively as Gibson

    County), and 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 and to assist the community in its efforts to promote sound floodplain

    management. This information will also be used by Gibson 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 National Flood Insurance Program (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.

    Furthermore, the Towns of Fort Branch, Haubstadt, Mackey, Owensville, and

    Somerville as well as the City of Oakland do not have special flood hazard areas

    within their incorporated limits. However, for the purpose of complete county-wide

    mapping of Gibson County, these communities are still included in this FIS and

    FIRMs.

    The Digital Flood Insurance Rate Map (DFIRM) and FIS report for this countywide

    study have been produced in digital format. Flood hazard information was converted

    to meet the Federal Emergency Management Agency (FEMA) DFIRM database

    specifications and Geographic Information System (GIS) format requirements. The

    flood hazard information was created and is provided in a digital format so that it can

    be incorporated into local GIS and be accessed more easily by the community.

  • 2

    1.2 Authority and Acknowledgments

    The sources of authority for this Flood Insurance Study are the National Flood

    Insurance Act of 1968 and the Flood Disaster Protection Act of 1973.

    Information of the authority and acknowledgements for each of the new studies and

    previously printed FIS reports and Flood Insurance Rate Maps (FIRMs) for

    communities within Gibson County was compiled and is shown below:

    Gibson County

    (Unincorporated Areas) No previous FIS.

    New Studies: The hydrologic and hydraulic analyses for approximate

    stream reaches of Gibson County were performed by

    Morley and Associates, Inc., on behalf of the Indiana

    Department of Natural Resources, under Indiana Public

    Works Project Number E060008. The Indiana

    Department of Natural Resources managed the

    production of this study as part of their Cooperating

    Technical Partner agreement with the Federal

    Emergency Management Agency dated April 29, 2004,

    which was defined by the Indiana DNR Mapping

    Activity Statement 07-10 dated July 3, 2007 and funded

    under agreement number EMC-2007-CA-7021.

    Hydrologic and hydraulic analyses for the detailed

    study stream reaches were performed the U.S. Army

    Corps of Engineers.

    Redelineation of the previously effective flood hazard information for this FIS report,

    correction to the North American Vertical Datum of 1988, and conversion of the

    unincorporated and incorporated areas of Gibson County into the Countywide format

    was performed by Morley and Associates, Inc., on behalf of the Indiana Department

    of Natural Resources, under Indiana Public Works Project Number E060008. The

    Indiana Department of Natural Resources managed the production of this study as

    part of their Cooperating Technical Partner agreement with the Federal Emergency

    Management Agency dated April 29, 2004, which was defined by the Indiana DNR

    Mapping Activity Statement 07-10 dated July 3, 2007 and funded under agreement

    number EMC-2007-CA-7021.

    1.3 Coordination

    The purpose of an initial Consultation Coordinated Officers (CCOs) meeting is to

    discuss the scope of the FIS. A final CCO meeting is held to review the results of the

    study. No previous dates exist for the initial and final CCO meetings because there

  • 3

    are no previously effective FIS reports covering the geographic area of Gibson

    County, Indiana.

    The coordinate system used for the production of the digital FIRMs is the Transverse

    Mercator projection, Indiana State Plane coordinate system, East Zone, referenced to

    the North American Datum of 1983 and the GRS 1980 spheroid.

    For this countywide FIS, an initial CCO meeting was held on October 4, 2006, and

    was attended by IDNR, the Princeton Health Department, the Town of Owensville,

    the Gibson Highway Department, the Gibson County Safety Department, the City of

    Princeton, the U.S. Army Corps of Engineers the Gibson County Emergency

    Management Agency, and the Gibson County Surveyor.

    The results of the countywide study were reviewed at the final CCO meeting held on

    --, and attended by representatives of FEMA, IDNR and_______. All problems

    raised at that meeting have been addressed.

    2.0 AREA STUDIED

    2.1 Scope of Study

    This FIS covers the geographic area of Gibson County, Indiana, including the

    incorporated communities listed in Section 1.1.

    All FIRM panels for Gibson County have bee