Appendix 104-4: H&H Report Sample Format
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COVER
- Bridge No.
- P6 ID
- Contract No.
- Federal Aid No.
- Contract Title
- Report Prepared By:
- Signature and Seal of Professional Engineer Responsible for the H&H Report with Date of Report Approval
BODY
- INTRODUCTION
- Objective
- General Description of Bridge Project and Surrounding Area
- Roadway Classification and Design Frequency
- General Description of Existing Bridge/Culvert Characteristics
- General Description of Proposed Bridge/Culvert Characteristics (Include Bridge / Culvert Characteristics Table)
- Flood (FEMA) Zone and History (high-water marks, dates, debris, overtopping, source of data)
- Stream and Stream Bed Characteristics (Erosion, Scour, etc.)
- Reference Datum
- Upstream Conditions (building structures, dams, major tributaries, flood control structures)
- HYDROLOGIC ANALYSIS
- Objective
- Drainage Area
- Hydrologic Computation Methodologies
- Hydrologic Summary Table Design Event Discharge (Include FEMA Flows)
- Flood Frequency Curve
- HYDRAULIC ANALYSIS
- Objective
- Hydraulic Analysis Methodology
- Cross Section Data
- Boundary Conditions
- Manning’s Roughness Coefficients
- Energy Loss Coefficients
- Structure Modeling
- Modeling of Existing Structure and Roadway
- Modeling of Proposed Structure and Roadway
- Results including Summary Table of Existing v. Proposed Conditions Water Surface Elevations (WSE), Difference and Velocities (Design Event, 100-Year Event)
- A summary of results from 2-D modeling (if warranted)
- Temporary Conditions
- SCOUR ANALYSIS (Box culverts and rigid frames less than 25 feet span do not require a scour analysis, but scour countermeasures need to be provided at the inlet and outlet).
- Scour event
- Scour Analysis and Calculation Summary
- Countermeasures and Calculation Summary
- TIDAL INFLUENCES (if warranted)
- RISK ASSESSMENT (if warranted)
REFERENCES
APPENDICES
- H&H Report Hydraulic Data Summary Sheet (Appendix 104-3)
- Supplemental maps (Location Map, Drainage Area Map (StreamStats), Aerial Photographs, Soils Maps, FEMA FIRM, etc.)
- Site Photographs (Both approaches, looking downstream and upstream at structure, looking downstream and upstream from structures, opening(s)
- Hydraulic Field Assessment Checklist (Appendix 104-1)
- Design Drawings (HEC-RAS cross section locations, bridge design, plan and profile, E&S, existing and proposed 100-Year Floodplain, Scour protection, etc.)
- Hydrologic Calculations
- Hydraulic Calculations
- Digital HEC-RAS files
- Printed Existing and Proposed HEC-RAS Summary Table
- HEC-RAS cross sections plotted six (6) per page with the above event water surface elevations for existing, proposed and temporary conditions.
- HEC-RAS Plot of Existing versus Proposed Water Surface for:
- Design event
- 100-year event
- Scour Design Event
- Temporary Conditions Drawings and Calculations
- Scour and Channel Protection (Riprap Sizing, Countermeasures) Calculations