DODGE COUNTY, WISCONSIN AND INCORPORATED AREAS COMMUNITY COMMUNITY NAME NUMBER BEAVER DAM, CITY OF 550095 BROWNSVILLE, VILLAGE OF 550096 * CLYMAN, VILLAGE OF 550447 COLUMBUS, CITY OF 550058 DODGE COUNTY (UNINCORPORATED AREAS) 550094 FOX LAKE, CITY OF 550097 HARTFORD, CITY OF 550473 HORICON, CITY OF 550098 HUSTISFORD, VILLAGE OF 550557 * IRON RIDGE, VILLAGE OF 550100 * JUNEAU, CITY OF 550448 KEKOSKEE, VILLAGE OF 550101 * LOMIRA, VILLAGE OF 550449 LOWELL, VILLAGE OF 550102 MAYVILLE, CITY OF 550103 NEOSHO, VILLAGE OF 550104 * RANDOLPH, VILLAGE OF 550072 REESEVILLE, VILLAGE OF 550105 THERESA, VILLAGE OF 550106 WATERTOWN, CITY OF 550107 WAUPUN, CITY OF 550108 * NO SPECIAL FLOOD HAZARD AREAS IDENTIFIED IN DODGE COUNTY April 19, 2010 Federal Emergency Management Agency Flood Insurance Study Number 55027CV000A 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) may not contain all data available within the Community Map Repository. Please contact the Community Map Repository for any additional data. 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 A99 AE B X C X 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. Initial Countywide FIS Effective Date: April 19, 2010 Revised Countywide Effective Dates: TABLE OF CONTENTS Page 1.0 INTRODUCTION................................................................................................... 1 1.1 Purpose of Study.......................................................................................... 1 1.2 Authority and Acknowledgements.............................................................. 2 1.3 Coordination................................................................................................ 4 2.0 AREA STUDIED.....................................................................................................5 2.1 Scope of Study............................................................................................. 5 2.2 Community Description............................................................................... 7 2.3 Principal Flood Problems............................................................................. 8 2.4 Flood Protection Measures........................................................................ 11 3.0 ENGINEERING METHODS................................................................................ 12 3.1 Hydrologic Analyses.................................................................................. 12 3.2 Hydraulic Analyses.................................................................................... 18 3.3 Vertical Datum........................................................................................... 23 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS........................................... 25 4.1 Floodplain Boundaries............................................................................... 25 4.2 Floodways.................................................................................................. 26 5.0 INSURANCE APPLICATION............................................................................. 43 6.0 FLOOD INSURANCE RATE MAP..................................................................... 43 7.0 OTHER STUDIES................................................................................................. 44 8.0 LOCATION OF DATA......................................................................................... 44 9.0 BIBLIOGRAPHY AND REFERENCES.............................................................. 47 i TABLE OF CONTENTS (continued) Page FIGURES Figure 1 – Flood Scenes in Beaver Dam, June 2008.........................................................10 Figure 2 – Floodway Schematic........................................................................................ 27 TABLES Table 1 – Initial and Final CCO Meetings........................................................................... 4 Table 2 – Letters of Map Change…………........................................................................ 7 Table 3 – Summary of Stillwater Elevations..................................................................... 16 Table 4 – Summary of Discharges.....................................................................................17 Table 5 – Roughness Coefficients..................................................................................... 22 Table 6 – Vertical Datum Conversion Factor.................................................................... 24 Table 7 – Floodway Data................................................................................................... 28 Table 8 – Community Map History................................................................................... 45 EXHIBITS Exhibit 1 - Flood Profiles Panels Beaver Dam River 01P-02P Crawfish River 03P-05P Davy Creek 06P East Branch Rock River 07P-16P Libby Creek 17P Maunesha River 18P Old Mill Creek 19P-21P Park Creek 22P-26P Pratt Creek 27P Rock River 28P-33P Rubicon River 34P Silver Creek 35P-37P Spring Brook 38P Unnamed Tributary to Rock River 39P Exhibit 2 - Flood Insurance Rate Map Index Flood Insurance Rate Map ii FLOOD INSURANCE STUDY DODGE COUNTY, WISCONSIN 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 Dodge County, including the Cities of Beaver Dam, Columbus, Fox Lake, Hartford, Horicon, Juneau, Mayville, Watertown and Waupun; the Villages of Brownsville, Clyman, Hustisford, Iron Ridge, Kekoskee, Lomira, Lowell, Neosho, Randolph, Reeseville, and Theresa; and the unincorporated areas of Dodge County (referred to collectively herein as Dodge 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. Please note that the City of Watertown is geographically located in Dodge and Jefferson Counties. The City of Waupun is geographically located in Fond du Lac and Dodge Counties. The City of Columbus and the Village of Randolph are geographically located in Dodge and Columbia Counties. The City of Hartford is geographically located in Dodge and Washington Counties. The portions of these communities which are contained within Dodge County are included in this FIS. See the separately printed FIS report and Flood Insurance Rate Maps (FIRMs) for areas outside Dodge County. Please note that the City of Juneau and the Villages of Clyman, Iron Ridge, Lomira, and Randolph have no special flood hazard areas identified. 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 1.2 Authority and Acknowledgements The sources of authority for this FIS are the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This FIS was prepared to include the unincorporated areas and incorporated communities within Dodge County into a countywide FIS. Information on the authority and acknowledgments for each jurisdiction included in this countywide FIS, as compiled from their previously printed FIS reports, is shown below. Beaver Dam, City of: The hydrologic and hydraulic analysis for the original FIS report effective on October 3, 1983, were performed by Donohue & Associates, Inc., for FEMA, under contract No. EMW-C-0287. That work was completed in September, 1980. Dodge County (Unincorporated Areas): The hydrologic and hydraulic analyses for the original FIS report effective on December 15, 1980, were performed by the U.S. Geological Survey (USGS) for the Federal Insurance Administration (FIA), under Inter-Agency Agreement No. IAA-H-9-N, Project Order No. 25. That work was completed in June 1979. Fox Lake, City of: The hydrologic and hydraulic analyses for the original FIS report effective on September 16, 1980, were performed by the USGS for the FIA, under Inter- Agency Agreement No. IAA-H-9-77, Project Order No. 25. That work was completed in October 1978. Horicon, City of: The hydrologic and hydraulic analyses for the original FIS report effective on February 1980, were performed by the USGS