FRANKLIN COUNTY, MISSOURI and INCORPORATED AREAS VOLUME 1 of 2
Total Page:16
File Type:pdf, Size:1020Kb
FRANKLIN COUNTY, MISSOURI AND INCORPORATED AREAS VOLUME 1 of 2 COMMUNITY NAME COMMUNITY NUMBER Berger, City of 290132 Franklin County 290493 Unincorporated Areas Gerald, City of* 290734 Leslie, Village of* 290304 Miramiguoa Park, 290992 Village of New Haven, City of 290133 Oak Grove, Village of 290554 Pacific, City of 290134 Parkway, Village of* 290532 St. Clair, City of 290135 Sullivan, City of 290136 Union, City of 290137 Washington, City of 290138 *No Special Flood Hazard Areas Identified EFFECTIVE: October 18, 2011 Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 29071CV001A 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 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 Flood Insurance Study may be revised and republished at any time. In addition, part of this Flood Insurance Study may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the Flood Insurance Study. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current Flood Insurance Study components. Selected Flood Insurance Rate Map panels for the 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 V1 through V30 VE B X C X Countywide FIS Effective Date: October 18, 2011 TABLE OF CONTENTS VOLUME I Page 1.0 INTRODUCTION .......................................................................................................................... 1 1.1 Purpose of Study ................................................................................................................. 1 1.2 Authority and Acknowledgments ....................................................................................... 2 1.2.1 Upper Mississippi River System Flood Frequency Study Methodology ................. 3 1.3 Coordination ....................................................................................................................... 3 2.0 AREA STUDIED ........................................................................................................................... 4 2.1 Scope of Study .................................................................................................................... 4 2.2 Community Description ...................................................................................................... 7 2.3 Principal Flood Problems .................................................................................................... 7 2.4 Flood Protection Measures ................................................................................................. 8 3.0 ENGINEERING METHODS ....................................................................................................... 9 3.1 Hydrologic Analyses ........................................................................................................... 9 3.1.1 Pre-Countywide Analysis ........................................................................................ 9 3.1.2 Countywide Analysis ............................................................................................. 11 3.1.3 Upper Mississippi River System Flow Frequency Study Methodology ................ 12 3.2 Hydraulic Analyses ........................................................................................................... 18 3.2.1 Pre-Countywide Analysis ...................................................................................... 18 3.2.2 Countywide Analysis ............................................................................................. 21 3.2.3 Upper Mississippi River System Flow Frequency Study Methodology ................ 22 3.3 Vertical Datum .................................................................................................................. 25 3.3.1 Methods for Missouri River ................................................................................... 25 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS ............................................................... 26 4.1 Floodplain Boundaries ...................................................................................................... 26 4.1.1 Methods for Missouri River ................................................................................... 27 4.2 Floodways ......................................................................................................................... 27 4.2.1 Methods for Missouri River ................................................................................... 28 5.0 INSURANCE APPLICATION ................................................................................................... 72 6.0 FLOOD INSURANCE RATE MAP........................................................................................... 72 7.0 OTHER STUDIES ....................................................................................................................... 73 8.0 LOCATION OF DATA ............................................................................................................... 73 9.0 BIBLIOGRAPHY AND REFERENCES ................................................................................... 73 FIGURES Figure 1 - Floodway Schematic .................................................................................................................. 28 i TABLE OF CONTENTS (continued) VOLUME I Page TABLES Table 1 – Summary of Community Studies Used to Compile Initial Countywide FIS ................................ 2 Table 2 – History of CCO Meeting Held for Franklin County FISs ............................................................. 3 Table 3 – Streams Studied by Detailed Methods .......................................................................................... 4 Table 4 – Summary of Discharges .............................................................................................................. 13 Table 5 – Manning’s “n” Values for Detailed Study Streams .................................................................... 24 Table 6 – Floodway Data ............................................................................................................................ 29 Table 7 – Community Map History ............................................................................................................ 74 VOLUME II EXHIBITS Exhibit 1 - Flood Profiles Birch Creek Panels 01P-02P Bourbeuse River Panels 03P-09P Bourbeuse River Tributary Panels 10P Brown’s Branch Panels 11P-13P Brush Creek Panels 14P-17P Busch Creek Panels 18P-21P Calvey Creek Panels 22P-25P Dubois Creek Panels 26P-29P Fenton Creek Panels 30P Fiddle Creek Panels 31P-34P Flat Creek Panels 35P-38P Flat Creek North Tributary Panels 39P Happy Sock Creek Panels 40P-41P Labadie Creek Panels 42P Labadie Creek Tributary Panels 43P Little Calvey Creek Panels 44P-46P Little Meramec River Panels 47P-49P Little Tavern Creek Panels 50P-52P Meramec River Panels 53P-55P Missouri River Panels 56P-59P Monroe Branch Panels 60P-61P Pin Oak Creek Panels 62P-63P Pin Oak Creek Tributary Panels 64P Possum Creek Panels 65P-66P South Branch Busch Creek Panels 67P Southwest Branch Busch Creek Panels 68P-71P St. John’s Creek Panels 72P Thornton Branch Panels 73P Unnamed Tributary to Busch Creek Panels 74P Wild Horse Creek Panels 75P-76P ii TABLE OF CONTENTS (continued) VOLUME II Winch Creek Panels 77P-80P Winsel Creek Panels 81P-87P Exhibit 2 - PUBLISHED SEPARATELY: Flood Insurance Rate Map Index Flood Insurance Rate Map iii FLOOD INSURANCE STUDY FRANKLIN COUNTY, MISSOURI AND INCORPORATED AREAS 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study (FIS) revises and updates information on the existence and severity of flood hazards in the geographic area of Franklin County, including the Cities of Berger, Gerald, New Haven, Pacific, St. Clair, Sullivan, Union and Washington; the Villages of Leslie, Miramiguoa Park, Oak Grove, Parkway, and the unincorporated areas of Franklin County (referred to collectively herein as Franklin 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. 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. This information will be used by the communities to update existing floodplain regulations as part of the regular phase of the National Flood Insurance Program (NFIP). The information will also be used by local and regional planners to further promote sound land use and floodplain development. As part of this revision, the format of the map panels has changed. Previously, flood-hazard information was shown on both the Flood Insurance Rate Map (FIRM)