Rev. 12/21	Bridge No.
Job No.
Missouri Department of Transportation
Bridge Hydraulics and Scour Report
Designer	Date
Route	County	Stream
Location Map
Purpose of Hydraulic/Scour Study
(Write a brief statement describing project and purpose of hydraulic study)
National Flood Insurance Program Information
Has a flood insurance study been performed for the community? (http://www.fema.gov/cis/MO.pdf)
Is the bridge in a special flood hazard area? (If yes, a floodplain development permit will be required)
Is the bridge in a designated floodway? (If yes, a no-rise certification will be required)
Has a Flood Insurance Rate Map (FIRM) been published for the area?
What is the flood hazard zone for the site (A, A1, B, C, AE, etc.)?
Base (100-yr) Flood Elevation	(ft), Datum =	Floodway width
Map panel number	Map date
Additional comments on Flood Insurance Study:
Discharge Data
Drainage Area	(mi2)
Valley Slope (average slope between points 10% and 85% of valley length upstream)	(ft/mi)
Stream Length	(mi)
Method of Analysis (choose one or more)	Q25	Q50	Q100	Q500	Use
USGS regression equations
- Rural	Publication year =	Region =
- Urban	Publication year =	% Impervious =
Stream Gage	USGS Station Number =
FEMA Flood Insurance Study	Community Name =
Other =
Comments on Discharge calculations: (method chosen and why, expected level of upstream development, etc.)

Observed Extreme High Water
Elevation = (ft), Datum =	Location =	Date =
Comments on Observed Extreme High Water: (discharge, if known, etc.)
Discuss flow conditions in reach and describe existing conditions that may influence hydraulic behavior in reach:
Streambed Slope
Streambed Slope	(ft/ft)

Hydraulic Model
Model used:
Surface-Water Modeling System (SMS), Ver. with Sedimentation and River Hydraulics – Two-Dimensional (SRH-2D)
River Analysis System (HEC-RAS), Ver.	Other
Analysis & Flow Type:
Analysis Type:	One Dimensional (1D)	Two Dimensional (2D)	Other
Flow Type:	Steady Flow	Unsteady Flow	Other
Projection Data:
Vertical Datum	Horizontal Datum
Coordinate System	Zone
Projection Factor	Added False Northing	Added False Easting

Terrain:
Valley and Profile Sections (1D Models Only)	Describe which sections were used in the model and why:
Land XML file(s) from GEOPAK	LiDAR Terrain File, Scatter Set Name=
Roadway Field Survey Data, Scatter Set Name =
Channel/Bathymetric Field Survey Data (except geo files), Scatter Set Name =
Other = , Scatter Set Name =
Describe which scatter sets were used in the model and why:
LiDAR	LAS Files	Provide date and accuracy of data (i.e., QL1, QL2, point spacing, etc.), source/repository of data and projection changes: Describe any filtering done to downloaded files: Provide file name of scatter set(s):
DEM Files
Other
Bathymetry	Sections	Provide source and description of data: If channel sections were utilized describe how the sections were converted into a terrain: Provide file name(s) of scatter set(s):
Stamped
Other
Stamping	Fill	Describe and provide locations and underlying geometry:
Cut
Other	Provide source and description of data and how it was used:
Describe how terrain files were combined or modified to create the existing, natural and proposed conditions:

Bridge Modeling:
Describe existing and proposed bridges and methods used to model them: (Bridge loss method, pier loss coefficients, obstructions, pressure flow, etc.)

Mesh (2D Models Only): (Recommend providing images to help describe mesh in sections below)
Describe upstream limits of the mesh: (Limiting features, flow normalization, etc.)
Describe downstream limits of the mesh: (Flow constrictions, flow expansion, etc.)
Describe terrain features and mesh type, alignment and density used to depict them: (Streams, levees, patch, paving, at top of bank, at thalweg, etc.)
Describe the mesh quality:
Describe the differences between the scatter set terrain files and the associated mesh terrain files:
Describe the differences between the mesh terrain files, (i.e., Existing, Natural, etc.):

Boundary Conditions:
Describe inflow and outflow boundary types used:
Describe how the parameters for the starting water surface elevation was determined: (Slope, n-value, etc.)
Describe boundary conditions and type of modelling used for culverts (2D model only):
Describe pressure flow arcs (2D model only): (Location, Elevation, etc.)

Monitor Lines and Points (2D Model Only)
Describe location of monitor lines and points:
Materials/Roughness:
Describe the channel/overbank conditions and the roughness coefficients chosen:

Calibration\Sensitivity Analysis:
Describe how the model was calibrated or how sensitivity analysis was conducted:

Model Simulations Simulations:
Describe the simulations and files used in the simulations: (HEC-RAS plan descriptions and filenames, etc., SMS simulations and filenames, etc.)
Model Controls (2D Models Only):
General Tab	Start Time (hrs.)	0.0	Time Step (seconds)	End Time (hrs.)
Initial Condition	Dry	Use pressure ceiling
Output Tab	Output Format	XMDF	Output Units	English	Output Method	Specific Frequency
Output Frequency	1 hour	Output maximum datasets
Advanced Tab	Turbulence Model	Parabolic	Parabolic Turbulence	0.7	Unsteady Output
Additional comments on Model Control:

Hydraulic Model Results
Existing Conditions	Proposed Conditions
Frequency	Q25	Q50	Q100	Q500	QOT	Q25	Q50	Q100	Q500	QOT
Average Flood Elevation (ft)
Backwater (ft)
VAVE channel thru bridge (fps)
VAVE thru bridge opening (fps)
Freeboard (ft)
% Flow over roadway (%)
Overtopping (OT) frequency = Flood Elev. measured at Freeboard measured at Low Chord Elevation: Existing , Proposed	VAVE = average velocity VAVE channel = average velocity in channel
Method of determining location of Average Flood Elevation, Backwater and Freeboard:
Method of determining average water surface elevations:
Additional comments on model Results: (backwater, velocities, unusual conditions, model errors, etc. )

Scour Calculations
General Information: (Describe soil conditions in streambed and overbanks)
Contraction Scour Method:	Clear-Water Scour	Live-Bed Scour	Other
Comments on Contraction Scour calculations:
Pier Scour Method:	HEC-18	Complex Piers	Florida DOT	Other
Comments on Pier Scour calculations: (Do calculations account for the expected footing, was drift considered in determining pier width, etc?)
Abutment Scour Method:	Froehlich’s	HIRE	NCHRP	Other
Comments on Abutment Scour calculations:
Calculated Scour Depths
Scour Design Flood*	Scour Check Flood**	*Minimum of Scour Design Flood (Interstate = 200-yr, all other routes = 100-yr) and Overtopping Flood. ** Minimum of Scour Check Flood (500-yr) and Overtopping Flood.
Frequency
Contraction Scour
Pier Scour – Piers
Pier Scour – Piers
Pier Scour – Piers
Left Abutment Scour
Right Abutment Scour
Left and Right as viewed looking downstream.
Estimated Maximum Design Scour Elevations Elevation Return Period (Frequency) Left Abutment (End Bent No. ) Right Abutment (End Bent No. ) Intermediate Bent No. Intermediate Bent No. Intermediate Bent No. Intermediate Bent No. Left and Right as viewed looking downstream.
Scour Protection Measures
What measures are required to protect against scour?
Additional comments on scour calculations and/or scour protection:
General Information
Are there any improvements/buildings/crops/livestock that might be affected by alterations to the floodplain? (Include description and estimated value)
Special Considerations: (Describe any other special conditions or considerations which affect this project)
Bridge Layout Summary
Span Layout
Loading	Roadway Width	Skew	Alignment
Fill exception: Sta.	To Sta.
Design Exceptions: (Provide an explanation of any design exceptions requested and approved for this project)

Hydraulic Analysis Summary

Hydrologic Data
Drainage Area = mi2
Design Flood Frequency = years Design Flood Discharge = cfs Design Flood (D.F.) Elevation =
Base Flood (100-year)
Base Flood Elevation = Base Flood Discharge = cfs Estimated Backwater = ft Average Velocity thru Opening = ft/s
Freeboard (50-year)
Freeboard = ft
Roadway Overtopping
Overtopping Flood Discharge = cfs Overtopping Flood Frequency = years Flood Elevation =