1.5 ann‐marie kirsch fha hydraulic toolbox 2/11/2021

1.5 Ann‐Marie Kirsch FHA Hydraulic Toolbox 2/11/2021

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FHWA HYDRAULIC ANALYSIS TOOLS

NASECA ANNUAL CONFERENCEFebruary 10, 2021

Ann-Marie Kirsch, PESenior Water Resources Engineer

CONTACT INFORMATIONAnn‐Marie Kirsch, PE l AE2S Senior Water Resources Engineer

Advanced Engineering and Environmental Services, LLC (AE2S)

2424 Rimrock Road, Ste. 200

Madison, WI 53713

Ann‐[email protected]

608.605.5589

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FHWA Tools and Services

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Hydraulic Toolbox

Other FHWA H&H Analysis Software

Training Opportunities

Introduction to Highway Hydraulics

Culvert Design

Urban Drainage Design

Other Tools and Services

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Inlet Spacing Spreadsheet

WisDOT SharePoint site

Hydraulic Toolbox

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ToolboxWhat is it?Public Domain (Free!)

Series of Calculators Including:

Channel Analysis

Inlet Design

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ToolboxWhere Can I Find it?https://highways.dot.gov/federal‐lands/hydraulics

Channel Analysis

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Ditch and Pipe Capacity

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Determine Capacity for:

• Trapezoidal

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• Trapezoidal

Easy Pull‐Down Menu

Range of geometry

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• Trapezoidal

Solve for Depth with a known flow OR for flow with a known depth

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• Trapezoidal

Returns other hydraulic properties

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Determine Capacity for:• Trapezoidal

• Triangular

No bottom width included

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Determine Capacity for:• Trapezoidal• Triangular

• RectangularBottom width with vertical sidewalls

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Determine Capacity for:• Trapezoidal• Triangular• Rectangular

• Circular (pipes not flowing under pressure

Good for sizing storm sewers for full‐flow capacity and determining hydraulic properties for pipes not flowing full

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Determine Capacity for:• Trapezoidal• Triangular• Rectangular• Circular (pipes not flowing under pressure

• Irregular Cross Sections

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Channel Lining

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Channel Lining Analysis

BenefitsSame procedure as FDM

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Easy to analyze different channel sections

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Easy to analyze different channel sections

All the math is done in the program

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Lining Materials:

• Riprap or stone

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Lining Materials:• Riprap or stone

• Vegetation

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Lining Materials:• Riprap or stone• Vegetation

• Rolled Erosion Control Products

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Lining Materials:• Riprap or stone• Vegetation• Rolled Erosion Control Products

• Gabions

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Process:

• Select Lining Material

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Process:• Select Lining Material

• Channel Analysis

Transfers results of Channel Analysis to Lining Calculator

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• Channel Analysis

• Riprap Size Estimate D50 of material. Can base on standard distributions in FDM/Standard Bid Items

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• Channel Analysis• Riprap Example

• Compute

Channel is stable for this flow and geometry. May wish to iterate solution for smaller riprap

Culvert Outlet Protection

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Is outlet protection required?

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What size of stone?

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What size of stone?

Dimension of pad?

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Process:

• Define Channel Geometry

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Process:• Define Channel Geometry

• Edit Culvert Data

This data is obtained from HY‐8 or other culvert analysis program

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Process:• Define Channel Geometry

• Edit Culvert Data• Review Results

Calculator returns the riprap classification required and the dimension of the apron at the culvert outfall

Gradation Analysis

Gradation Analysis

• Upload Photo(s)

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Gradation Analysis• Upload Photo(s)

• Requires scale or scalable object

Gradation Analysis• Upload Photo(s)• Requires scale or scalable object

• Channel substrate


• Channel substrate

• Material delivered to site


• Channel substrate• Material delivered to site

• Follow prompts to complete computations

Gradation Results

Results include particle size distribution

Curb and Gutter Analysis

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Inlet Sizing

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Inlet Sizing

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Inlet Sizing

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BenefitsEasy to calculate encroachment

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Benefits Easy to calculate encroachment

Evaluates depth at curb

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Allows for different transverse slopes between roadway and gutter

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Great for calculating inlet sizing at sags and curb opening inlets (rare in Wisconsin)

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Inlet Sizing

Benefits Drawbacks Easy to calculate encroachment




Inlets on grade

Doesn’t use Neenah inlets

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Inlet Sizing

Benefits Drawbacks Easy to calculate encroachment




Inlets on grade and in sag

Doesn’t use Neenah inlets

Uses FHWA inlets and methodology

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Curb and Gutter Process:

• Roadway Geometry

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Allows for different gutter cross slope

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• Gutter Geometry

• Roughness

Same roughness for roadway and gutter

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• Gutter Geometry• Roughness

• Compute

Can compute for either flow or width of spread (encroachment)

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• Gutter Geometry• Roughness

• Compute

Can compute for either flow or width of spread (encroachment)

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• Gutter Geometry• Roughness• Compute

• ResultsReturns depth at curb and width of spread for a known flow

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Inlets in Sag Process:• Roadway Geometry

• Gutter Geometry• Roughness• Compute

• Results

Returns depth at curb and width of spread for a known flow

Inlet Spacing

Why don’t We use the Hydraulic Toolbox?

WisDOT Inlet Spacing Spreadsheet

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Wisconsin Doesn’t Use “FHWA” Inlets

Other Typical FHWA Inlet Types

Found in FHWA HEC‐22

FHWA Methodology

• Capacity determined by:• Amount of flow intercepted

• Amount of flow bypassing

• Interception depends on:• Flow in the gutter section

• Size and configuration of the grate

• Flow velocity

Neenah Foundry

Neenah Foundry

WisDOT SDDs Correspond to Neenah Catalog Items

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Grate Testing

Empirical testing developed inlet capacity curves

Testing Developed Efficiency Curves

WisDOT Spreadsheet for Neenah Inlets

Performs calculations and documents design for project files

Capacity Curves and Equations • Developed for each inlet to be used on grade

• R2 value of > 0.99 for each equation

• K values plotted as a function of cross slope for six longitudinal slopes

• Interpolated values for 3% and 5% slopes

Spreadsheet Details

• Available on WisDOT SharePoint:

• https://wigov.sharepoint.com/sites/dot‐dtsd/bpd/drainage/SitePages/Home.aspx

Spreadsheet Details



• Moving to Box for easier access

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Spreadsheet Details




• Contact Ed Lilla for access: [email protected]

Spreadsheet Details





• Spreadsheet includes detailed instructions and inlet capacity curves

Spreadsheet Details





• Spreadsheet includes detailed instructions and inlet capacity curves

• Reviewed by Neenah product engineers

Inlet Spacing in a SagUse spreadsheet to calculate• Weir Flow• Orifice Flow• Minimum Controls

Other Resources

FHWA NHI Training

•Online Courses https://www.nhi.fhwa.dot.gov/home.aspx

NHI

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FHWA NHI Training

• Online Courses https://www.nhi.fhwa.dot.gov/home.aspx

•Culvert DesignNHI

FHWA NHI Training


• Culvert Design• Introduction to Highway Hydraulics

NHI

FHWA NHI Training


• Culvert Design• Introduction to Highway Hydraulics

•Urban Drainage Design

NHI

Other FHWA Tools

Culvert Design

•Free!

HY‐8

Other FHWA Tools

Culvert Design• Free!•Standard software incorporated into other tools

HY‐8

Other FHWA Tools

Culvert Design• Free!• Standard software incorporated into other tools

•Energy dissipation designHY‐8

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Other FHWA Tools

Culvert Design• Free!• Standard software incorporated into other tools

• Energy dissipation design•Aquatic Organism Passage consideration

HY‐8

Drainage Design SharePoint

•NOAA Atlas 14 IDF Curves

WisDOT


• NOAA Atlas 14 IDF Curves•Previous Presentations

WisDOT


• NOAA Atlas 14 IDF Curves• Previous Presentations•Neenah Inlet Capacity Publication

WisDOT


• NOAA Atlas 14 IDF Curves• Previous Presentations• Neenah Inlet Capacity Publication• Inlet Spreadsheet Tool

WisDOT


• NOAA Atlas 14 IDF Curves• Previous Presentations• Neenah Inlet Capacity Publication• Inlet Spreadsheet Tool


WisDOT

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Questions?

ContactAnn-Marie Kirsch, PE

[email protected]

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1.5 ann‐marie kirsch fha hydraulic toolbox 2/11/2021

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