[House Document 105-165]
[From the U.S. Government Publishing Office]



105th Congress, 1st Session  - - - - - - - - - - House Document 105-165


 
        FLOOD DAMAGE REDUCTION PROJECT, MANATEE COUNTY, FLORIDA

                               __________

                             COMMUNICATION

                                  from

                     THE ACTING ASSISTANT SECRETARY

                             (CIVIL WORKS)

                       THE DEPARTMENT OF THE ARMY

                              transmitting

  A REPORT ON A FLOOD DAMAGE REDUCTION PROJECT FOR THE CEDAR HAMMOCK 
(WARES CREEK) AREA OF MANATEE COUNTY, FLORIDA, PURSUANT TO PUB. L. 104-
                          303, SEC. 101(a)(10)





  November 14, 1997.--Referred to the Committee on Transportation and 
                Infrastructure and ordered to be printed



                            C O N T E N T S

                              ----------                              
                                                                   Page
Letter of Transmittal............................................   vii
Comments of the Office of Management and Budget..................    ix
Comments of the State of Florida.................................     x
Comments of the Department of the Interior.......................    xv
Comments of the Environmental Protection Agency..................   xvi
Comments of the Department of Housing and Urban Development......    xx
Comments of the Federal Emergency Management Agency..............   xxi
Report of the Chief of Engineers, Department of the Army.........     1
Report of the District Engineer..................................     5
Syllabus.........................................................     6
Introduction.....................................................     7
    Authority....................................................     7
    Purpose and Scope............................................     7
    Process......................................................     8
        Initial Appraisal........................................     8
        Reconnaissance Phase.....................................     9
        Feasibility Phase........................................     9
    The Report...................................................    10
    Other Studies and Projects in the Area.......................    11
        Prior Studies and Reports................................    11
        Existing Water Resource Projects.........................    13
    Study Participants and Coordination..........................    13
Existing Conditions..............................................    14
    General Description..........................................    14
    Watershed Characteristics....................................    14
        Wares Creek..............................................    15
        Cedar Hammock............................................    15
    Physiography.................................................    19
    Geology and Soils............................................    19
    Climate......................................................    19
    Natural Forces...............................................    19
    Develop and Economy..........................................    20
        Employment...............................................    22
        Housing..................................................    22
    Existing Land Use Conditions.................................    23
    Cultural Resources...........................................    23
    Biological Resources.........................................    25
        Threatened or Endangered Species.........................    25
        Water Quality............................................    26
        Hazardous and Toxic Wastes...............................    26
        Air Quality and Noise....................................    27
    Aesthetic Resources..........................................    27
    Future Without Project Conditions............................    28
Problem Identification...........................................    29
    Problems, Needs and Opportunities............................    29
        Factors Contributing to Flooding.........................    29
        Historical Flood Conditions..............................    37
        Improvements Desired.....................................    41
Plan Formulation.................................................    43
    Federal Objective............................................    43
    National Economic Development Plan...........................    43
    Planning Goals and Objectives................................    43
    Planning Constraints.........................................    44
    Possible Measures............................................    45
        Nonstructural Measures...................................    45
        Structural Measures......................................    46
        Initial Evaluation.......................................    48
    Preliminary Alternative Plans................................    51
        Plan A...................................................    51
        Plan 2A..................................................    52
    Formulation..................................................    55
        Water Quality Analysis...................................    57
        Hardened Channel.........................................    57
        Water Control Structure..................................    57
        Retention Basins.........................................    58
        Bridge Replacement.......................................    60
Final Alternative Plans..........................................    64
    Minimum Plan.................................................    64
        Plan A--Trapezoidal and Sheet Pile Wall Channel..........    64
        Plan 2A--Trapezoidal Channel.............................    64
    One-Bridge Replacement Plan..................................    64
        Plan B--Trapezoidal and Sheet Pile Wall Channel with 
          Replacement of 9th Avenue West Bridge..................    64
        Plan 2B--Trapezoidal Channel with Replacement of 9th 
          Avenue West Bridge.....................................    64

                     SEVEN BRIDGE REPLACEMENT PLAN

        Plan C--Trapezoidal and Sheet Pile Wall Channel with 
          Replacement of 7 Bridges...............................    65
        Plan 2C--Trapezoidal Channel with Replacement of 7 
          Bridges................................................    65
Assessment and Evaluation........................................    75
    Identification of NED Plan...................................    75
    Environmental Effects........................................    77
        Biological Resources.....................................    77
        Water Quality............................................    78
        Air Quality and Noise....................................    78
        Aesthetic Resources......................................    79
The Selected Plan................................................    80
    Other Considerations.........................................    81
    Operation and Maintenance....................................    83
Plan Implementation..............................................    84
    Institutional Requirements...................................    84
    Division of Responsibilities and Cost Sharing................    84
    Cost Sharing for Flood Damage Reduction......................    84
        Deferred Payment.........................................    85
        Federal Funding Limit....................................    85
        Estimated Cost Sharing for Project.......................    85
        Financial Analysis.......................................    85
        Sponsor Views............................................    86
        Local Cooperation Agreement (LCA)........................    86
        Explanation of Cost Sharing Table........................    86
        Coordination and Public Involvement......................    87
Conclusions......................................................    88
Recommendations..................................................    89
References.......................................................    92
Comments of the Division Commander...............................    94
Environmental Assessment.........................................    97

                             LIST OF TABLES

Table:
     1. Population in Florida....................................    20
     2. Historical and Projected Population, Manatee County......    21
     3. Historical and Projected Population, City of Bradenton...    21
     4. GDamages Compiled by Manatee County Public Works 
      Department of September 1988 Storm.........................    40
     5. Without Project Condition Average Annual Damages.........    41
     6. Identification and Location of Existing Riprap or 
      Retaining Walls............................................    58
     7. Drainage Areas Sub-Basins................................    61
     8. Initial Cost of Retention Areas..........................    62
     9. G25-Year Level of Protection Preliminary Benefit/Cost 
      Comparison       Without Retention Areas...................    73
    10. G25-Year Level of Protection Preliminary Benefit/Cost 
      Comparison       With Retention Areas......................    74
    11. Selected Plan--Summary of Project Costs..................    82
    12. Selected Plan--Annual Benefits and Costs.................    83
    13. Estimated Cost Sharing Selected Plan.....................    87

                              ----------                              

                            LIST OF FIGURES

                                                                   Page
Figure:
     1. Location Map.............................................    16
     2. Cedar Hammock Watershed..................................    17
     3. Wares Creek and Cedar Hammock East Branch Sub-Basins.....    18
     4. Plan A...................................................    53
     5. Plan 2A..................................................    54
     6. Possible Retention Sites.................................    63
     7. Plan A...................................................    66
     8. Plan 2A..................................................    67
     9. Plan B...................................................    68
    10. Plan 2B..................................................    69
    11. Plan C...................................................    70
    12. Plan 2C..................................................    71
    13. Possible Retention Sites Revised.........................    72





                                
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