VOLUME 1 OF 2 WARREN COUNTY, NEW JERSEY (ALL JURISDICTIONS) COMMUNITY NAME COMMUNITY NUMBER ALLAMUCHY, TOWNSHIP OF 340480 ALPHA, BOROUGH OF 340576 BELVIDERE, TOWN OF 340481 Warren County BLAIRSTOWN, TOWNSHIP OF 340482 FRANKLIN, TOWNSHIP OF 340563 FRELINGHUYSEN, TOWNSHIP OF 340564 GREENWICH, TOWNSHIP OF 340483 HACKETTSTOWN, TOWN OF 340484 HARDWICK, TOWNSHIP OF 340528 HARMONY, TOWNSHIP OF 340485 HOPE, TOWNSHIP OF 340486 INDEPENDENCE, TOWNSHIP OF 340487 KNOWLTON, TOWNSHIP OF 340488 LIBERTY, TOWNSHIP OF 340489 LOPATCONG, TOWNSHIP OF 340574 MANSFIELD, TOWNSHIP OF 340491 OXFORD, TOWNSHIP OF 340492 PHILLIPSBURG, TOWN OF 340493 POHATCONG, TOWNSHIP OF 340494 WASHINGTON, BOROUGH OF 340495 WASHINGTON, TOWNSHIP OF 340496 WHITE, TOWNSHIP OF 340497 PRELIMINARY: AUGUST 31, 2009 Federal Emergency Management Agency FLOOD INSURANCE STUDY NUMBER 34041CV001A 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 repository. It is advisable to contact the community repository for any additional data. Selected Flood Insurance Rate Map panels for the communities within Warren County 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 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 Date: TABLE OF CONTENTS – Volume 1 1.0 INTRODUCTION 1 1.1 Purpose of Study 1 1.2 Authority and Acknowledgements 1 1.3 Coordination 3 2.0 AREA STUDIED 6 2.1 Scope of Study 6 2.2 Community Description 7 2.3 Principal Flood Problems 7 2.4 Flood Protection Measures 8 3.0 ENGINEERING METHODS 10 3.1 Hydrologic Analyses 10 3.2 Hydraulic Analyses 17 3.3 Vertical Datum 22 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS 23 4.1 Floodplain Boundaries 23 4.2 Floodways 23 5.0 INSURANCE APPLICATIONS 65 6.0 FLOOD INSURANCE RATE MAP 67 7.0 OTHER STUDIES 70 8.0 LOCATION OF DATA 70 9.0 BIBLIOGRAPHY AND REFERENCES 71 i TABLE OF CONTENTS – Volume 1 (Continued) FIGURES PAGE Figure 1 - FLOODWAY SCHEMATIC 24 TABLES Table 1 - INITIAL AND FINAL CCO MEETINGS 5 Table 2 - FLOODING SOURCES STUDIED BY DETAILED METHODS 6 Table 3 - STREAM NAME CHANGES 6 Table 4 - LETTERS OF MAP CORRECTION 7 Table 5 - SUMMARY OF DISCHARGES 13 Table 6 - MANNING'S "n" VALUES 21 Table 7 - FLOODWAY DATA 25 Table 8 - COMMUNITY MAP HISTORY 68 ii TABLE OF CONTENTS – Volume 2 EXHIBITS Exhibit 1 – Flood Profiles Beaver Brook Panels 001P-005P Blair Creek Panel 006P Buckhorn Creek Panels 007P-009P Buckhorn Creek Tributary 1 Panels 010P-012P Delaware River Panels 013P-032P Dry Run Panels 033P-036P Hackettstown Brook Panels 037P-038P Hances Brook Panels 039P-040P Honey Run Panels 041P-043P Jacksonburg Creek Panel 044P Lopatcong Creek Panels 045P-051P Merrill Creek Panels 052P-057P Merrill Creek (Left Channel) Panels 058P-059P Mill Brook Panels 060P-061P Montana Brook Panels 062P-063P Musconetcong River Panels 064P-079P Musconetcong River Tributary M-8 Panels 080P-081P Paulins Kill Panels 082P-084P Pequest River Panels 085P-088P Pohatcong Creek Panels 089P-100P Pohatcong Creek Tributary 1 Panels 101P-102P Shabbecong Creek Panels 103P-104P Sigler Brook Panel 105P Trout Brook Panels 106P-111P Exhibit 2 – Flood Insurance Rate Map Index Flood Insurance Rate Map iii FLOOD INSURANCE STUDY WARREN COUNTY, NEW JERSEY (ALL JURISDICTIONS) 1.0 INTRODUCTION 1.1 Purpose of Study This countywide Flood Insurance Study (FIS) investigates the existence and severity of flood hazards in, or revises and updates previous FISs/Flood Insurance Rate Maps (FIRMs) for the geographic area of Warren County, New Jersey, including: the boroughs of Alpha and Washington; the towns of Belvidere, Hackettstown and Phillipsburg; and the townships of Allamuchy, Blairstown, Franklin, Frelinghuysen, Greenwich, Hardwick, Harmony, Hope, Independence, Knowlton, Liberty, Lopatcong, Mansfield, Oxford, Pohatcong, Washington and White (hereinafter referred to collectively as Warren County). This FIS aids in the administration of the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This FIS has developed flood risk data for various areas of the county that will be used to establish actuarial flood insurance rates. This information will also be used by Warren County to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP), and will also be used 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 are the National Flood Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This FIS was prepared to include all communities within Warren County in a countywide format. 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. Allamuchy, Township of: the hydrologic and hydraulic analyses for the FIS dated February 15, 1983 were conducted by Anderson-Nichols & Company under subcontract to the New Jersey Department of Environmental Protection (NJDEP) for the Federal Emergency Management Agency (FEMA) under Contract No. H-3959. The work was completed in January 1981. Belvidere, Town of: the hydrologic and hydraulic analyses for the FIS dated June 1979 were prepared by the U.S. Department of Agriculture (USDA), Soil Conservation Service (SCS) for the U.S. Department of Housing and Urban Development, Federal Insurance Administration (FIA) under Inter Agency Agreement No. IAA-H-976, Project Order No. 11. The work was completed in January 1978. Blairstown, Township of: the hydrologic and hydraulic analyses for the FIS revised May 2, 1991 were prepared by the SCS in cooperation with NJDEP, Division of Water Resources, during a Flood Plain Management Study. The original analyses for the FIS dated March 1, 1983 were prepared by Richard Browne Associates for FEMA under Contract No. H-6809. The work was completed in May 1982. Franklin, Township of: the hydrologic and hydraulic analyses for the FIS dated February 2, 1982 were conducted by Anderson-Nichols & Company under subcontract to NJDEP for FEMA under Contract No. H-3959. The work was completed in June 1980. Greenwich, Township of: the hydrologic and hydraulic analyses for the FIS revised May 17, 2004 were prepared by NJDEP and provided to FEMA. The work was completed in December 2002. The original analyses for the FIS dated February 2, 1982 were prepared by NJDEP for FEMA under Contract No. H-3959. The work was completed in November, 1980. Hackettstown, Town of: the hydrologic and hydraulic analyses for the FIS dated March 1, 1983 were conducted by Anderson- Nichols & Company under subcontract to NJDEP for the FEMA under Contract No. H-3959. The work was completed in January 1981. Harmony, Township of: the hydrologic and hydraulic analyses for the FIS revised June 6, 2001 were prepared by the U.S. Army Corps of Engineers (USACE), Philadelphia District, for FEMA. The work was completed in 2 June 1996. The original analyses for the FIS dated May 4, 1981 were conducted by Michael Baker, Jr., Inc. under subcontract to NJDEP for FEMA under Contract No. H-3959. The work was completed in August 1978. Hope, Township of: the hydrologic and hydraulic analyses for the FIS revised August 19, 1991 were prepared by the USDA, SCS during the preparation of a floodplain management study for the Pequest River watershed. The original analyses for the FIS dated March 4, 1983 were prepared by FEMA. Knowlton, Township of: the hydrologic and hydraulic analyses for the FIS dated July 6, 1982 were prepared by Richard Browne Associates, for FEMA under Contract No. H-6809. The work was completed in February 1981. Liberty, Township of: the hydrologic and hydraulic analyses for the FIS revised March 14, 1991 were prepared by the USDA, SCS during the preparation of a floodplain management study for the Pequest River watershed. The original analyses for the FIS dated March 18, 1983 were prepared by FEMA. Lopatcong, Township of: the hydrologic and hydraulic analyses for the FIS dated September 15, 1981 were prepared by NJDEP, Division of Water Resources under agreement with FEMA, and represent a revision of original analyses also conducted by NJDEP. The work was completed in November 1979. Mansfield, Township of: the hydrologic and hydraulic analyses for the FIS dated March 15, 1983 were conducted by Anderson- Nichols & Company under subcontract to NJDEP for FEMA under Contract No. H-3959. The work was completed in December 1980. Phillipsburg, Town of: the hydrologic and hydraulic analyses for the FIS revised July 19, 2001 were prepared by USACE, Philadelphia District, for FEMA. The work was completed in June 1996. The original analyses for the FIS dated May 4, 1981 were conducted by Michael Baker, Jr., Inc.