Hydraulic Design Manual: Manual Notice

♦Manual Notice 2019-1
►1. Manual Introduction
- ►1. About this Manual
  - ♦Purpose
  - ♦Conventions and Assumptions
  - ♦Organization
  - ♦Feedback
- ♦2. Introduction to Hydraulic Analysis and Design
►2. Hydraulic Practices and Governing Law
►3. Processes and Procedures in TxDOT Hydrologic and Hydraulic Activities
►4. Hydrology
- ♦1. Hydrology’s Role in Hydraulic Design
- ►2. Probability of Exceedance
  - ♦Annual Exceedance Probability (AEP)
  - ♦Design AEP
- ►3. Hydrology Policies and Standards
- ♦4. Hydrology Study Requirements
- ►5. Hydrology Study Data Requirements
- ♦6. Design Flood and Check Flood Standards
- ♦7. Selection of the Appropriate Method for Calculating Runoff
- ♦8. Validation of Results from the Chosen Method
- ►9. Statistical Analysis of Stream Gauge Data
- ►10. Regression Equations Method
  - ♦Procedure for Using Omega EM Regression Equations for Natural Basins
- ►11. Time of Concentration
- ►12. Rational Method
  - ♦Assumptions and Limitations
  - ♦Procedure for using the Rational Method
  - ♦Rainfall Intensity
  - ♦Runoff Coefficients
  - ♦Mixed Land Use
- ►13. Hydrograph Method
- ♦14. References
- ►15. Glossary of Hydrology Terms
  - ♦Annual Exceedance Probability (AEP)
  - ♦Annual Flood
  - ♦Annual Flood Series
  - ♦Antecedent Conditions
  - ♦Area-Capacity Curve
  - ♦Attenuation
  - ♦Backwater
  - ♦Bank
  - ♦Bank Storage
  - ♦Bankfull Stage
  - ♦Base Discharge (for peak discharge)
  - ♦Baseflow
  - ♦Basic Hydrologic Data
  - ♦Basic-Stage Flood Series
  - ♦Bifurcation
  - ♦Binomial Statistical Distribution
  - ♦Boundary Condition
  - ♦Calibration
  - ♦Canopy-Interception
  - ♦Channel (watercourse)
  - ♦Channel Storage
  - ♦Computation Duration
  - ♦Computation Interval
  - ♦Concentration Time
  - ♦Confluence
  - ♦Continuous Model
  - ♦Correlation
  - ♦Dendritic
  - ♦Depression Storage
  - ♦Design Flood
  - ♦Design Storm
  - ♦Detention Basin
  - ♦Diffusion
  - ♦Direct Runoff
  - ♦Discharge
  - ♦Discharge Rating Curve
  - ♦Distribution Graph (distribution hydrograph)
  - ♦Diversion
  - ♦Drainage Area
  - ♦Drainage Divide
  - ♦Duration Curve
  - ♦ET
  - ♦Effective Precipitation (rainfall)
  - ♦Evaporation
  - ♦Evaporation Demand
  - ♦Evaporation Pan
  - ♦Evaporation, Total
  - ♦Evapotranspiration
  - ♦Event-Based Model
  - ♦Exceedance Probability
  - ♦Excess Precipitation
  - ♦Excessive Rainfall
  - ♦Falling Limb
  - ♦Field Capacity
  - ♦Field-Moisture Deficiency
  - ♦Flood
  - ♦Flood Crest
  - ♦Flood Event
  - ♦Flood Peak
  - ♦Floodplain
  - ♦Flood Profile
  - ♦Flood Routing
  - ♦Flood Stage
  - ♦Flood Wave
  - ♦Flood, Maximum Probable
  - ♦Flood-Frequency Curve
  - ♦Floodway
  - ♦Flow-Duration Curve
  - ♦Gauging Station
  - ♦Ground Water
  - ♦Groundwater Outflow
  - ♦Groundwater Runoff
  - ♦Hydraulic Radius
  - ♦Hydrograph
  - ♦Hydrologic Budget
  - ♦Hydrologic Cycle
  - ♦Hydrology
  - ♦Hyetograph
  - ♦Index Precipitation
  - ♦Infiltration
  - ♦Infiltration Capacity
  - ♦Infiltration Index
  - ♦Inflection Point
  - ♦Initial Condition
  - ♦Interception
  - ♦Isohyetal Line
  - ♦Lag
  - ♦Lag Time
  - ♦Loss
  - ♦Mass Curve
  - ♦Maximum Probable Flood
  - ♦Meander
  - ♦Model
  - ♦Moisture
  - ♦Objective Function
  - ♦Overland Flow
  - ♦Parameter
  - ♦Parameter Estimation
  - ♦Partial-Duration Flood Series
  - ♦Peak Flow
  - ♦Peak Stage
  - ♦Percolation
  - ♦PMF
  - ♦Precipitation
  - ♦Precipitation, Probable Maximum
  - ♦Probability of Capacity Exceedance
  - ♦Probability of Exceedance
  - ♦Rain
  - ♦Rainfall
  - ♦Rainfall Excess
  - ♦Rating Curve
  - ♦Reach
  - ♦Recession Curve
  - ♦Recurrence Interval (return period)
  - ♦Regulation, Regulated
  - ♦Reservoir
  - ♦Residual-Mass Curve
  - ♦Retention Basin
  - ♦Rising Limb
  - ♦Runoff
  - ♦Saturation Zone
  - ♦NRCS Curve Number
  - ♦Snow
  - ♦Soil Moisture Accounting (SMA)
  - ♦Soil Moisture (soil water)
  - ♦Soil Profile
  - ♦Stage
  - ♦Stage-Capacity Curve
  - ♦Stage-Discharge Curve (rating curve)
  - ♦Stage-Discharge Relation
  - ♦Stemflow
  - ♦Storage
  - ♦Storm
  - ♦Stream
  - ♦Stream Gauging
  - ♦Streamflow
  - ♦Stream-Gauging Station
  - ♦Sublimation
  - ♦Surface Runoff
  - ♦Surface Water
  - ♦Tension Zone
  - ♦Time of Concentration
  - ♦Time of Rise
  - ♦Time to Peak
  - ♦TR-20
  - ♦TR-55
  - ♦Transpiration
  - ♦Underflow
  - ♦Unit Hydrograph
  - ♦Vadose Zone
  - ♦Water Year
  - ♦Watershed
  - ♦WinTR-55
►5. NFIP Design of Floodplain Encroachments & Cross Drainage Structures
►6. Hydraulic Principles
- ►1. Open Channel Flow
  - ♦Introduction
  - ♦Continuity and Velocity
  - ♦Channel Capacity
  - ♦Conveyance
  - ♦Energy Equations
  - ♦Energy Balance Equation
  - ♦Depth of Flow
  - ♦Froude Number
  - ♦Flow Types
  - ♦Cross Sections
  - ♦Roughness Coefficients
  - ♦Subdividing Cross Sections
  - ♦Importance of Correct Subdivision
- ►2. Flow in Conduits
  - ♦Open Channel Flow or Pressure Flow
  - ♦Depth in Conduits
  - ♦Roughness Coefficients
  - ♦Energy
  - ♦Steep Slope versus Mild Slope
- ►3. Hydraulic Grade Line Analysis
►7. Channels
- ►1. Introduction
  - ♦Open Channel Types
  - ♦Methods Used for Depth of Flow Calculations
- ►2. Stream Channel Planning Considerations and Design Criteria
- ►3. Roadside Channel Design
  - ♦Roadside Drainage Channels
  - ♦Channel Linings
  - ♦Rigid versus Flexible Lining
  - ♦Channel Lining Design Procedure
  - ♦Trial Runs
- ►4. Stream Stability Issues
  - ♦Stream Geomorphology
  - ♦Stream Classification
  - ♦Modification to Meandering
  - ♦Graded Stream and Poised Stream Modification
  - ♦Modification Guidelines
  - ♦Realignment Evaluation Procedure
  - ♦Response Possibilities and Solutions
  - ♦Environmental Mitigation Measures
  - ♦Countermeasures
  - ♦Altered Stream Sinuosity
  - ♦Stabilization and Bank Protection
  - ♦Revetments
- ►5. Channel Analysis Guidelines
  - ♦Stage-Discharge Relationship
  - ♦Switchback
- ►6. Channel Analysis Methods
  - ♦Introduction
  - ♦Slope Conveyance Method
  - ♦Slope Conveyance Procedure
  - ♦Standard Step Backwater Method
  - ♦Standard Step Data Requirements
  - ♦Standard Step Procedure
  - ♦Profile Convergence
►8. Culverts
- ►1. Introduction
  - ♦Definition and Purpose
  - ♦Construction
  - ♦Inlets
- ►2. Design Considerations
  - ♦Economics
  - ♦Site Data
  - ♦Culvert Location
  - ♦Waterway Considerations
  - ♦Roadway Data
  - ♦Allowable Headwater
  - ♦Outlet Velocity
  - ♦End Treatments
  - ♦Traffic Safety
  - ♦Culvert Selection
  - ♦Culvert Shapes
  - ♦Multiple Barrel Boxes
  - ♦Design versus Analysis
  - ♦Culvert Design Process
  - ♦Design Guidelines and Procedure for Culverts
- ►3. Hydraulic Operation of Culverts
  - ♦Parameters
  - ♦Headwater under Inlet Control
  - ♦Headwater under Outlet Control
  - ♦Energy Losses through Conduit
  - ♦Free Surface Flow (Type A)
  - ♦Full Flow in Conduit (Type B)
  - ♦Full Flow at Outlet and Free Surface Flow at Inlet (Type BA)
  - ♦Free Surface at Outlet and Full Flow at Inlet (Type AB)
  - ♦Energy Balance at Inlet
  - ♦Slug Flow
  - ♦Determination of Outlet Velocity
  - ♦Depth Estimation Approaches
  - ♦Direct Step Backwater Method
  - ♦Subcritical Flow and Steep Slope
  - ♦Supercritical Flow and Steep Slope
  - ♦Hydraulic Jump in Culverts
  - ♦Sequent Depth
  - ♦Roadway Overtopping
  - ♦Performance Curves
  - ♦Exit Loss Considerations
- ►4. Improved Inlets
  - ♦Inlet Use
- ►5. Velocity Protection and Control Devices
  - ♦Excess Velocity
  - ♦Velocity Protection Devices
  - ♦Velocity Control Devices
  - ♦Broken Back Design and Provisions Procedure
  - ♦Energy Dissipators
- ►6. Special Applications
  - ♦Detour Culverts
  - ♦Risk
  - ♦Engineering Requirements
►9. Bridges
►10. Storm Drains
- ►1. Introduction
  - ♦Overview of Urban Drainage Design
  - ♦Overview of Storm Drain Design
- ►2. Preliminary Concept Development
  - ♦Design Checklist
  - ♦1. Problem Identification
  - ♦2. System Plan
  - ♦3. Design Criteria
  - ♦4. Outfall Considerations and Features
  - ♦5. Utility Conflicts
  - ♦6. Construction
  - ♦7. System Design
  - ♦8. Check Flood
  - ♦9. Documentation Requirements
- ►3. Runoff
  - ♦Hydrologic Considerations for Storm Drain Systems
  - ♦Flow Diversions
  - ♦Detention
  - ♦Determination of Runoff
  - ♦Other Hydrologic Methods
- ►4. Pavement Drainage
  - ♦Design Objectives
  - ♦Ponding
  - ♦Longitudinal Slopes
  - ♦Transverse (Cross) Slopes
  - ♦Hydroplaning
  - ♦Use of Rough Pavement Texture
- ►5. Storm Drain Inlets
  - ♦Inlet Types
  - ♦Curb Opening Inlets
  - ♦Grate Inlets
  - ♦Linear Drains
  - ♦Slotted Drains
  - ♦Trench Drains
  - ♦Combination Inlets
  - ♦Inlets in Sag Configurations
  - ♦Median/Ditch Drains
  - ♦Drainage Chutes
  - ♦Inlet Locations
- ►6. Gutter and Inlet Equations
- ►7. Conduit Systems
  - ♦Conduits
  - ♦Access Holes (Manholes)
  - ♦Junction Angles
  - ♦Inverted Siphons
  - ♦Conduit Capacity Equations
  - ♦Conduit Design Procedure
  - ♦Conduit Analysis
- ►8. Conduit Systems Energy Losses
►11. Pump Stations
- ►1. Introduction
- ►2. Pump Station Components
  - ♦Overview of Components
- ►3. Pump Station Hydrology
  - ♦Methods for Design
  - ♦Procedure to Determine Mass Inflow
- ►4. Pump Station Hydraulic Design Procedure
  - ♦Introduction
  - ♦Storage Design Guidelines
  - ♦Pump Selection
►12. Reservoirs
- ♦1. Introduction
- ►2. Coordination with Other Agencies
  - ♦Reservoir Agencies
  - ♦TxDOT Coordination
- ►3. Reservoir Analysis Factors
  - ♦Hydrology Methods
  - ♦Flood Storage Potential
  - ♦Reservoir Discharge Facilities
- ►4. Highways Downstream of Dams
  - ♦Peak Discharge
  - ♦Scour Considerations
  - ♦Design Adequacy
- ►5. Highways Upstream of Dams
  - ♦New Location Highways
  - ♦Existing Highways
  - ♦Minimum Top Establishment
  - ♦Structure Location
  - ♦Scour Considerations
- ►6. Embankment Protection
  - ♦Introduction
  - ♦Embankment Protection Location
  - ♦Rock Riprap
  - ♦Soil-Cement Riprap
  - ♦Articulated Riprap
  - ♦Concrete Riprap
  - ♦Vegetation
►13. Storm Water Management
►14. Conduit Strength and Durability
- ►1. Conduit Durability
  - ♦Introduction
  - ♦Service Life
- ►2. Estimated Service Life
- ►3. Installation Conditions
  - ♦Introduction
  - ♦Trench
  - ♦Positive Projecting (Embankment)
  - ♦Negative Projecting (Embankment)
  - ♦Imperfect Trench
  - ♦Bedding for Pipe Conduits
- ►4. Structural Characteristics
  - ♦Introduction
  - ♦Corrugated Metal Pipe Strength
  - ♦Concrete Pipe Strength
  - ♦High Strength Reinforced Concrete Pipe
  - ♦Recommended RCP Strength Specifications
  - ♦Strength for Jacked Pipe
  - ♦Reinforced Concrete Box
  - ♦Plastic Pipe
►15. Coastal Hydraulic Design
- ►1. Definitions
  - ♦A
  - ♦B
  - ♦C
  - ♦D
  - ♦E
  - ♦F
  - ♦G
  - ♦H
  - ♦I
  - ♦J
  - ♦L
  - ♦M
  - ♦N
  - ♦O
  - ♦P
  - ♦R
  - ♦S
  - ♦T
  - ♦W
- ►2. Introduction and Applicability
  - ♦Purpose
  - ♦Applicable Projects
  - ♦How to Use This Document
  - ♦Level 1, 2, and 3 Analysis Discussion and Examples
  - ♦Chapter Overview
- ►3. Stillwater Levels
- ►4. Waves & Currents
  - ♦Introduction
  - ♦Waves
  - ♦Wave-Generated Currents
- ►5. Design Elevation and Freeboard
- ►6. Erosion
  - ♦Scour
  - ♦Shoreline Change
- ►7. Additional Considerations
- ♦8. References

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Manual Notice: 2019-1

From: Camille Thomason, P.E.

Manual: Hydraulic Design Manual

Effective Date: September 12, 2019

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Purpose

To implement new research and best practices.

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Contents

The following updates were made to the Hydraulic Design Manual:

Chapter 4 – Hydrology

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Section 2 – Added brief discussion on significant digits.

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Section 9 – Updated Statistical Analysis of Stream Gage Data with new release of USGS Bulletin 17C.

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Section 10 – Updated mean annual precipitation map for use in Regression equations.

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Section 11 – Minor edits to time of concentration (Tc) guidance.

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Section 12 &13 – Updated to NOAA Atlas 14 rainfall data.

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Section 13 – Update on Rainfall Temporal Distribution based on NRCS guidance.

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Section 13 – Added additional Peak Rate Factor (PRF) guidance.

Chapter 15 – Coastal Hydraulic Design

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Added a new chapter providing guidance for designing or evaluating coastal hydraulic transportation infrastructure projects.

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Supersedes

The revised manual supersedes prior versions of the Hydraulic Design Manual.

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Contact

Please direct any questions about this manual to Ab Maamar-Tayeb, P.E., CFM at (512) 416-2328 or Abderrahmane.MaamarTayeb@txdot.gov.

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Archives

Past manual notices are available in a PDF archive.