banner

Design Manual

 

Chapter 1 — General Information

 
1A Introduction  
  1A-1...................About This Manual
1B General  
  1B-1..................Glossary and Abbreviations  
  1B-2...................Contact Information  
  1B-4...................Densities for Use in Estimating Quantities
  1B-6...................Project Cost Estimates  
  1B-7...................Managing Changes in Project Concepts
1C Standards and Design Criteria  
  1C-1...................Selecting Design Criteria
  1C-7...................Public Interest Findings
1C-8...................Documenting Design Decisions
1D Plan Development  
  1D-1...................Project Flow Chart
1D-3...................Preliminary Survey Procedure
1D-4...................Pavement Determination Process
1D-7...................Interchange Review
1D-8...................Access Review Submittal
1D-9...................Field Examination Checklist (New and Reconstructed Highways)
1D-10.................Field Examination Checklist (3R and 4R Projects)
1D-14.................Lighting Warrants Request
1D-15.................Design Public Meeting Displays
1E Plan Preparation  
  1E-1....................Certification of Plans
1E-3....................Plan Revisions
1E-4....................Road Design Details
1E-5....................Standard Road Plans
1E-6
....................Designer Information for Standard Road Plans
1E-7....................Designer Information for Road Design Details
1E-8....................Plan Submittals for County Review
1E-9....................Standard Notes
1F Plan Sheets  
  1F-1....................Plan Sheets – General Information
1F-2....................A Sheets
     1F-2a..................Title Sheet
     1F-2b..................Location Map Sheets
     1F-2c..................Plan Revision Sheets
1F-3....................B Sheets
     1F-3a..................Typical Cross Sections
1F-4....................C Sheets
     1F-4a..................Project Description Tabulation
    1F-4.5..................CS Sheets
1F-5....................D Sheets
     1F-5a..................Plan and Profile Legend and Symbol Information Sheet
     1F-5b..................Plan and Profile Sheets
1F-6.....................E Sheets
1F-7.....................F Sheets
1F-8.....................G Sheets
1F-9.....................H Sheets and HE Sheets
1F-10...................J Sheets
1F-11...................K Sheets
1F-12...................L Sheets
     1F-12b...........Intersection Layout Sheets
1F-13...................M Sheets
1F-13.5..............MIT Sheets
1F-14...................N Sheets
1F-15...................P Sheets
1F-16...................Q Sheets
1F-17...................R Sheets
1F-18...................S Sheets
1F-19...................SPS Sheets
1F-20...................T Sheets
1F-21...................U Sheets
1F-22...................V Sheets
1F-23...................W, X, and Y Sheets
     1F-23a............Cross Section Spacing and Sheet Dimensions
1F-24...................Z Sheets
1G Bid Item Information  
  1G-1...................Bid Item Determination and Quantity Estimation
1G-5...................Bidding Mobilizations for Erosion Control
1G-6...................Salvaged Materials
1G-7...................Monitoring with Incident Response
1G-8...................Items Left in Place between Projects
1G-10.................Bidding Alternate Items
1H Final Plan Preparations  
  1H-1...................Plan Turn-In
1H-2...................Changes After Plan Turn-In
1H-3...................Communication with Contractors and Field Staff

Chapter 2 — Alignments

 
2A Horizontal Alignment  
  2A-1...................Horizontal Alignment
2A-2...................Superelevation
2A-3...................Superelevation Tables
2A-4...................Superelevation Transition Considerations for Pavement Drainage
2B Vertical Curves  
  2B-1...................Vertical Alignment
2C Spiral Curves  
  2C-1...................Spiral Curve Design
2D Reverse Curves  
  2D-1...................Reverse Curve Design

Chapter 3 — Cross Sections

 
3A Roadways  
  3A-1...................Typical Roadway Sections
3C Shoulders and Curbs  
  3C-2...................Curbs
3C-3...................Shoulder Cross Slope
3C-3.5................Shoulder Design Changes
3C-4...................Shoulder Design
3C-5...................Milled Rumble Strips
3C-6...................Safety Edge
3D Subgrade and Subbase  
  3D-1...................Subgrade Slopes
3D-2...................Grading on Multi-Year Projects
3D-3...................Pavement Drainage and Strength Layers
3E Medians  
  3E-1....................Medians
3E-2....................Median Crossings
3E-3....................Median Crossovers
3F Foreslopes  
  3F-2....................Foreslopes at Drainage Structures
3F-3....................Transverse Slope Adjustment at Entrances and Safety Ramps
3G Ditches  
  3G-1...................Roadway Ditches
3G-2...................Intercepting Ditches
3J Berms and Benches  
  3J-1.....................Berms and Benches
3K Access Points  
  3K-2...................Entrance Design

Chapter 4 — Drainage

 
4A Urban Drainage Design  
  4A-1...................Introduction to Stormwater Drainage System Design
4A-2...................Stormwater Drainage System Information Sources, Documentation, and Permitting
4A-3
...................Effects of Roadway Geometrics On Pavement Drainage
4A-4.
..................Concept Plan

4A-5....................Using the Rational Method to Determine Peak Flow
4A-6.
..................Calculating Spread and Checking Intake Location
4A-7...................Open-throat Curb Intakes
4A-8...................Barrier Grate Intakes
4A-10.................Storm Sewer Design
4A-11.................Cost Estimates and City Agreements
4A-12.................Removing or Abandoning Storm or Sanitary Sewer
4A-13.................Removing Intakes or Manholes
4A-50.................Introduction to Geopak Drainage
4A-51.................Creating a Survey Report
4A-52.................Starting a GEOPAK Drainage Project
4A-53.................GEOPAK Drainage-Structures
4A-54.................GEOPAK Drainage Area
4A-55.................Geopak Drainage – Pipes
4A-56.................Geopak Drainage – Networks
4A-57.................Geopak Drainage – Pipe Profiles
4A-58.................Geopak Drainage – Drainage Reports
4B Rural Drainage Design  
  4B-1...................Determining Entrance and Safety Ramp Pipe Culvert Lengths  
  4B-2...................Livestock Passes
4B-3...................Removing or Abandoning Culverts
4C Subdrains  
  4C-1...................Subdrains
4C-2...................Bridge End Drains

Chapter 5 — Earthwork

 
5A Excavation  
  5A-1...................Rock Excavation
5A-5...................Culvert Excavation and Backfill
5B Contractor Furnished Borrow  
  5B-1...................Contractor Furnished Borrow

Chapter 6 — Geometric Design

 
6A Geometric Design of Intersections  
  6A-1...................Horizontal Intersection Design: Rural Two-Lane  
  6A-2...................Intersection Design Vehicle
  6A-3...................Modern Roundabouts-General Guidance
     6A-3a.................Roundabout Feasibility Initial Screening Tool
6A-7...................Rumble Strips at Intersections
6A-8...................Intersection Alignment (Rural Primary Highways)
6A-9...................Edge Profiles
6A-10...................Intersection Edge of Traveled Way Design (Edge Returns)
6A-11...................Stop Sign Islands
6B Geometric Design of Interchanges  
  6B-1...................Cross Sections of One-Way Ramps and Loops
6B-2...................County Roads through Interchanges
6B-3...................County Roads over Primary Highways
6B-6...................Accesses and Safety Dikes at Ramp/Loop Terminals
6C Geometric Design of Lanes  
  6C-1...................Adding, Dropping, or Redirecting Through Lanes
6C-5
...................Four-Lane Expressway Turn Lanes
6C-6...................Continuous Two-Way Left-Turn Lanes (TWLTLs)
6C-8...................Parking on Urban Highways
6D Sight Distance  
  6D-1...................Sight Distance
6D-3...................Passing Sight Distance

Chapter 7 — Pavement

 
7A Portland Cement Concrete  
  7A-2...............Jointing Guidelines
7A-3...............Jointing Rural Intersections
7A-4...............Jointing Urban Intersections
7A-5...............Jointing Cul-de-Sacs
7C Granular Surfaces  
  7C-1...............Granular Surfacing
7D Other  
  7D-1...............Determination of Reinforced Bridge Approach Section Dimension
7D-3...............Pavement Markings
7D-4...............Treatment of Old Roadbeds
7D-8...............Pavement Widening on Resurfacing Projects for Non-NHS Highways
7D-10.............Tabulating Adjustment of Manholes, Intakes, Fire Hydrants, and Other Fixtures

Chapter 8 — Roadside Safety

 
8A Introduction  
  8A-1...................Introduction to Roadside Safety
8A-2...................Clear Zones
8A-3...................Treatment Options for Obstacles within the Clear Zone
8A-4
...................Warrants for Specific Obstacles
8B Treatments  
  8B-4...................Culvert Treatments
8B-5...................Choosing a Barrier
8B-6
....................Locating a Barrier
8B-10.................Tabulating Guardrail
8C Barrier Design  
  8C-2...................Guardrail and Curbs
8C-5...................Crash Cushions

Chapter 9 — Traffic Control

 
9A Principles  
  9A-1...................Fundamental Principles of Traffic Control in Work Zones
9A-2...................Traffic Control Zones
9A-3...................Tapers
9A-4...................Regulatory Speed Limit Changes
9A-5...................Traffic Control Plans
9B Traffic Control Devices  
  9B-1...................Basic Requirements of Traffic Control Devices
9B-2...................Signs
9B-3...................Channelizing Devices
9B-4...................Raised Pavement Markers and Delineators
9B-5...................Warning Lights
9B-6...................Floodlights
9B-7...................Arrow Displays
9B-8...................Changeable Message Signs
9B-9
...................Temporary Barrier Rail
9B-10
.................Road Closure Barricades and Safety Closures
9C Work Zone Applications  
  9C-1...................Introduction to Work Zone Activities
9C-2...................Work Located Off the Traveled Way
9C-3...................Work on Two-Lane Roadways
9C-4...................Work on Multi-Lane Roadways
9C-5...................Control of Traffic through Incident Areas
9C-6...................On-Site Detours and Temporary Connections
9C-7...................Haul Road Crossings
9D Pavement Markings  
  9D-1...................Pavement Markings

Chapter 10 — Roadside Development and Erosion Control

10A Topsoil  
  10A-1.................Topsoil Replacement  
10B Seeding, Fertilizing, and Mulching  
  10B-1.................Seeding, Fertilizing, and Mulching
10C Erosion Control  
  10C-1.................Temporary Erosion Control Devices
10D Permits  
  10D-1.................Storm Water Discharge Permits  
10E Fencing  
  10E-1..................Fencing  

Chapter 11 — Other Design Topics

11D Miscellaneous  
  11D-1.................Casing Pipe
11D-2.................Noise Wall Design Process

Chapter 12 — Sidewalks and Bicycle Facilities

12A Sidewalks  
  12A-1.................General Sidewalk Requirements
12A-2.................Accessible Sidewalk Requirements
12A-3.................Protruding Objects
12A-4.................Pedestrian Facilities During Construction
12B Bicycle Facilities  
  12B-1.................Pedestrian and Bicycle Facilities
12B-2.................Shared Use Path Design
12B-10...............Pedestrian Path Guidelines: Safety Rail
12C Detailed Design Criteria  
  12C-1.................Check for ADA Compliance

Chapter 20 — Project Automation Information

 
20A Starting a New Project - General  
  20A-1................Start New MicroStation Project
20A-2................Survey Request
20A-3................Plan Development CADD Standards
20A-20..............Attaching Reference Ties and Bench Marks
20B Folders and Files  
  20B-1..................Design Seed File Listing
20B-41................Project Directory Folder Structure
20B-44................Project Directory Design Folder Structure
20B-51................Folder and Files, Photo and Survey
20B-71................Electronic Files Supplied by the Office of Design
20B-75................Office of Location and Environment File Exchange
20B-81................Project Directory Letting Folder Structure
20D GEOPAK Setup and General Information  
  20D-2.................GEOPAK® Element and File Naming Convention
20F Modeling & Geopak Cross-Sections  
  20F-21................Corridor Modeler - Bridge Berm
20H Geopak 3D and Machine Control Grading  
  20H-10................Creating XML Machine Guidance Files
20J Project Bid Items & Quantities (PSS)  
  20J-61................Calculation Files
20J-71................Project Locator
20J-81................Accessing the Project Scheduling System
20J-82................Bid Item Information
20J-83................Importing Bid Items
20J-86................Alternate Bid Item Sheet Formatting

Chapter 21 — Automation Tool Instructions

 
21A D & C Manager Tools  
  21A-1.................CPN Data Instructions; Model, Data, and Attachment
21A-5.................InfoSnap – Quick Info
21A-6.................Open Explorer to Working Directory
21A-7.................Remove Empty Text Strings
21A-8.................Sink/Restore Dialogs
21A-11...............VBA Tool Box, Horizontal
21A-12...............VBA Tool Box, Vertical
21A-21...............Cell Clipper
21A-22...............Copy, Rotate, and Scale tool
21A-23...............Measure Horizontal Distance
21A-24...............Measure Slope Distance
21A-25...............Move Element(s) From Level to Level
21A-26...............Rotate (Active Elements)
21A-27...............Text, Change Size
21A-36...............Create Backup File on “C” Drive
21A-37...............Level Match
21A-38...............Turn Selected Levels On/Off
21A-39...............Ref-Map
21A-40...............Create New Models
21A-41...............Model Export and Import
21A-42...............Model Rename
21A-43...............Save Model to the Alt File
21A-44...............Model Search
21A-45...............Raster Replace Drive Letter with Server Name
21A-46...............Ref File Level Lock
21A-48...............Reference Display, On-Off
21A-49...............Reference List
21A-50...............Reference Attach
21A-51...............Reference Detach
21A-52...............Legend and Symbol Information Sheets
21A-53...............Text Labeler
21A-80...............Batch Print Shape Placement
21A-81...............Border Send to Back and Copy Print Border
21A-150.............Color Changer
21A-151.............Multi Scale Creator
21A-201.............COGO Alignments, Plan View
21A-202.............COGO Profiles, Alignments
21A-203.............COGO Profiles, Entrance
21A-204.............COGO Ditch Grade Placement Tool
21A-206.............InDGN Lines
21A-502.............PPP (Pollution Prevention Plan) Instructions
21A-503.............Existing Utility Legend
21A-600.............Soils Borrow Quantity Text Box
21A-800.............The D&C Compute Mode
21B Geopak  
  21B-2................Motif and Layout Builder programs for P&P Sheeting
21B-3.................P & P Sheet - DBG Guide Cells
21B-4.................P & P Geopak Sheeting Instruction
21B-5.................P & P Sheeting Library Development
21B-6.................P & P Port Shape Parameters
21B-7.................P & P Sheeting Port Names, Levels, Colors
21B-20...............Roadway Cross-Section Sheet Composition
21B-22...............Granular Blanket Cross-Section Line-Work
21B-23...............Drawing Utility Symbols with GEOPAK Ancillary Features
21B-58...............Geopak Tables
21B-65...............Geopak Project Manager
21B-68...............Superelevation – Automated
21B-155.............Typical Component Tool
21B-156.............Geopak TIN to XML Conversion
21B-157.............DTM Draw Surfaces
21B-158.............Surface Clipping
21B-159.............Creating Profiles from Survey Shots
21B-200.............Corridor Modeler
21B-224.............Corridor Modeler Templates and Components
21B-250.............Draw Cross Sections from Surfaces
21B-270.............Developing 3D Models for Design Projects
21B-280.............Corridor Modeler Labeler
21B-290.............Drive Roadway-Corridor Modeler
21B-300.............Draping Raster Images
21C MicroStation  
  21C-33...............PDF Scroll, Creating & Plotting
21C-53...............Hyperlinks in Microstation
21C-54...............CopySeed Program
21C-55...............View Groups vs Models
21C-56...............Attach a Multipage PDF to a MicroStation File
21E Printing, Plan Turn-ins  
  21E-1................MicroStation Batch Printing to PDF
21E-4................Color Plan Procedures
21F DOT ProjectWise System  
  21F-1................NonDOT User Access to Iowa DOT ProjectWise System

21M Miscellaneous Topics  
  21M-1.................FTP Site Access
21M-11...............Creating Hyperlinks
21M-12...............Create File and Folder Listing
21M-39
..............Work Schedule Instructions
21M-41..............Long Term Project E-mail Storage
21M-42..............How to Capture the Full Path to a File
21M-43..............File Extensions do not Display - Windows 7
21M-45..............Cost Estimates Quick Guide
21M-46..............Cost Estimates Program Details
21M-51..............Superelevation Transition Evaluation Tool

Chapter 40 — Design Survey Specifications

 
40B Surface Topography Data Collection  
  40B-1.................Feature Codes – Full Descriptions
40B-2.................Feature Codes - Titles Only
40B-3.................Feature Codes - Categories
40B-4.................Feature Codes - Modifications
40B-5.................Full and Partial DTM Surveys
40B-7.................Bridge Data Collection
40B-8.................Culvert Data Collection
40B-9.................Storm Sewer Intakes and Manhole Data Collection
40B-10...............Feature Codes for Roadway Survey
40B-11...............Feature Codes for Entrance and Intersection Survey
40B-12...............Feature Codes for Curb & Gutter Survey
40D MicroStation and GEOPAK Survey Mapping Process
 

40D-1.................Folder Structure and File Naming
40D-2................Survey Preferences
40D-3.................Loading Datasets
40D-4.................Editing Survey Data
40D-5.................Checking for Crossing Chains
40D-6.................Creating Horizontal Alignments
40D-7.................Processing Datasets in Models and Zones
40D-8.................Build DTM from Elements
40D-9.................Build DTM from Survey Data
40D-10...............Editing the DTM
40D-11...............Drawing Contours
40D-12...............Using Design and Computation (D&C) Manager
40D-13...............Drawing Horizontal Alignments
40D-14...............Station and Offset Reports
40D-15...............Completing the G Sheet
40D-16...............GEOPAK Survey TOPO Model Links
40D-17...............How to Use the Survey Information

Chapter 70 — Methods Processes

 
70A Formatting Guidelines  
  70A-10...............Data Entry Sheets - Formatting Guidelines

Chapter 120 — Specifications

120A Specifications Documents  
  120A-1...............Specifications Overview
120A-2...............Developmental Specifications
120A-3
...............Special Provisions
120A-4...............Writing Specifications

Chapter 200 — Geotechnical Design

200A Overview of Geotechnical Design  
  200A-1...............Introduction
200A-2...............Project Coordination
200A-3...............Geotechnical Consultant Services and Review
200B S Events  
  200B-1...............The S1 Event
200B-2...............The S2 Event
200B-3...............The S3 Event
200B-4...............The S4 Event
200C Surface Investigation Methods  
  200C-1...............Subsurface Investigation Methods
200D Laboratory Testing  
  200D-1...............Laboratory Testing Procedures
200E Engineering Properties of Soil and Rock  
  200E-1...............Engineering Properties of Soil and Rock
200F Analysis, Design, and Treatment  
  200F-1...............Slope Stability
200F-2...............Embankments
200F-3...............Mechanically Stabilized Earth (MSE) Wall Evaluations
200F-4...............Driven Pile Design
200F-5...............Drilled Shaft Design
200F-6...............Intermediate Foundation Improvements (IFIs)
200F-7...............Prefabricated Vertical Wick Drains (PVDs)
200F-8...............Rock Cut Slopes
200F-9...............Geosynthetic Design
200F-10.............Landslide Analysis and Mitigation
200F-11.............Soil Cut Slopes
200G Construction Involvement  
  200G-1...............Construction Involvement
200H Emergency Relief Projects  
  200H-1...............Emergency Relief Projects
200I Appendix A – Consultant Geotechnical Work Requirements
  200I-1...............Appendix A - Consultant Geotechnical (Soils Design) Work Requirements
Design Manual Video Index  

Revision Letters