DRAINAGE DESIGN MANUAL |
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| SUMMARY of REVISIONS | R-1 | Aug, 2024 |
| Distribution Memo-COVER-DISCLAIMER-EXECUTIVE SUMMARY | ES-1 | Jan, 2023 |
| LIST OF TABLES | LOT-i | Jan, 2023 |
| LIST OF FIGURES | LOF-i | Jan, 2023 |
| 1.0 INTRODUCTION | 1-1 | Jan, 2023 |
| 1.1 ABBREVATIONS AND SYMBOLS | 1-3 | Jan, 2023 |
| 1.2 DEFINITIONS | 1-13 | Jan, 2023 |
| 1.3 DESIGN PROCEDURE | 1-19 | Jan, 2023 |
| 1.4 PROJECT PERMITS | 1-22 | Jan, 2023 |
| 1.5 PLAN REQUIREMENTS | 1-23 | Jan, 2023 |
| 1.5.1 Drainage Area Sheets | 1-23 | Jan, 2023 |
| 1.5.2 Drainage Data Sheet | 1-25 | Jan, 2023 |
| 1.5.3 Crossroad Pipes | 1-25 | Jan, 2023 |
| 1.5.4 RCB Culverts and Extensions | 1-28 | Jan, 2023 |
| 1.5.5 Detention-Storage Structures | 1-28 | Jan, 2023 |
| 1.5.6 Road Ditches | 1-28 | Jan, 2023 |
| 1.5.7 Storm Sewers | 1-28 | Jan, 2023 |
| 1.5.8 Precast Structures | 1-28 | Jan, 2023 |
| 1.5.9 Pipe Liners | 1-29 | Jan, 2023 |
| 1.6 COMUTER PROGRAMS | 1-30 | Jan, 2023 |
| 1.7 REFERENCES | 1-31 | Jan, 2023 |
| 2.0 DRAINAGE POLICIES | 2-1 | Jan, 2023 |
| 2.1 CHANGES TO DRAINAGE CONDITIONS | 2-2 | Jan, 2023 |
| 2.1.1 Changes in Drainage Areas | 2-3 | Jan, 2023 |
| 2.1.2 Changes in Permeability of Surfaces | 2-3 | Jan, 2023 |
| 2.1.3 Changes in Channels | 2-3 | Jan, 2023 |
| 2.1.4 Changes to Drainage Structures | 2-4 | Jan, 2023 |
| 2.2 COORDINATION WITH OTHER GOVERNMENTAL AGENCIES | 2-5 | Jan, 2023 |
| 2.3 ALLOWABLE WATER SURFACE ELEVATION | 2-7 | Aug, 2024 |
| 2.4 RECURRENCE INTERVAL | 2-8 | Aug, 2024 |
| 2.5 DETENTION STORAGE DESIGN FOR CULVERTS | 2-10 | Jan, 2023 |
| 2.6 ALTERNATE TYPES AND MATERIALS FOR DRAINAGE STRUCTURES | 2-11 | Jan, 2023 |
| 2.6.1 Alternate Structure Types | 2-11 | Jan, 2023 |
| 2.6.2 Corrugated Metal Pipe | 2-11 | Jan, 2023 |
| 2.6.3 Thermoplastic Pipe | 2-11 | Jan, 2023 |
| 2.6.4 Precast Structures | 2-11 | Jan, 2023 |
| 2.6.5 Proprietary Items | 2-11 | Jan, 2023 |
| 2.7 MINIMUM SIZES FOR DRAINAGE STRUCTURES | 2-12 | Jan, 2023 |
| 2.8 END TREATMENTS FOR DRAINAGE STRUCTURES | 2-12 | Jan, 2023 |
| 2.9 REFERENCES | 2-14 | Jan, 2023 |
| 3.0 HYDROLOGY | 3-1 | Jan, 2023 |
| 3.1 HYDROLOGIC METHODS | 3-2 | Jan, 2023 |
| 3.2 RATIONAL METHOD | 3-3 | Jan, 2023 |
| 3.2.1 Rational Formula | 3-3 | Jan, 2023 |
| 3.2.2 Time of Concentration | 3-3 | Jan, 2023 |
| 3.2.3 Rainfall Intensity | 3-4 | Jan, 2023 |
| 3.2.4 Runoff Coefficients | 3-5 | Jan, 2023 |
| 3.2.5 Example: Design Flow by Rational Method | 3-6 | Jan, 2023 |
| 3.3 EXTENDED RATIONAL METHOD | 3-9 | Jan, 2023 |
| 3.3.1 Three-Variable Regression Equations for Flood Discharge | 3-9 | Jan, 2023 |
| 3.3.2 Basin-Average Rainfall Intensity | 3-10 | Jan, 2023 |
| 3.2.3 Example Application | 3-11 | Jan, 2023 |
| 3.4 THREE-VARIABLE REGRESSION METHOD | 3-13 | Jan, 2023 |
| 3.4.1 Regression Equations for CDA less than 30 square miles | 3-13 | Jan, 2023 |
| 3.4.2 Regression Equations for CDA greater than than 30 square miles | 3-16 | Jan, 2023 |
| 3.4.3 Example: Design Flows from USGS Regression Equations | 3-18 | Jan, 2023 |
| 3.5 USGS REGRESSION METHOD FOR KANSAS | 3-20 | Jan, 2023 |
| 3.5.1 Overview | 3-20 | Jan, 2023 |
| 3.5.2 Computer Program | 3-20 | Jan, 2023 |
| 3.5.3 Design Storms | 3-20 | Jan, 2023 |
| 3.5.4 Rainfall-Runoff Model | 3-22 | Jan, 2023 |
| 3.5.5 Streamflow Hydrographs | 3-31 | Jan, 2023 |
| 3.5.6 Channel Routing | 3-32 | Jan, 2023 |
| 3.5.7 Reservoir Routing | 3-34 | Jan, 2023 |
| 3.6 REFERENCES | 3-35 | Jan, 2023 |
| 4.0 CHANNELS | 4-1 | Jan, 2023 |
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| 4.1 SITE APPLICATIONS | 4-2 | Jan, 2023 |
| 4.1.1 Road Ditches | 4-2 | Jan, 2023 |
| 4.1.2 Interceptor Ditches | 4-2 | Jan, 2023 |
| 4.1.3 Grade Control Structures | 4-2 | Jan, 2023 |
| 4.1.4 Changes to Streams | 4-2 | Jan, 2023 |
| 4.2 TYPES OF CHANNEL LININGS | 4-3 | Jan, 2023 |
| 4.3 DESIGN CRITERIA FOR ROAD DITCHES | 4-5 | Jan, 2023 |
| 4.3.1 Allowable Water Surface and Recurrence Interval | 4-5 | Jan, 2023 |
| 4.3.2 Ditch Lining and Stability | 4-5 | Jan, 2023 |
| 4.3.3 Cross Section | 4-6 | Jan, 2023 |
| 4.3.4 Minimum Grade | 4-6 | Jan, 2023 |
| 4.3.5 Scour Protection for Highway Embankments | 4-6 | Jan, 2023 |
| 4.4 CHANNEL CAPACITY | 4-7 | Jan, 2023 |
| 4.4.1 Manning's Equation for Uniform Flow | 4-7 | Jan, 2023 |
| 4.4.2 Geometric Relationships for Trapezoidal Channels | 4-7 | Jan, 2023 |
| 4.4.3 Manning's Roughness Coefficient | 4-9 | Jan, 2023 |
| 4.4.4 Uniform Flow in Trapezoidal Channels | 4-11 | Jan, 2023 |
| 4.4.5 Example: Discharge for Uniform Flow in a Grass-Lined Road Ditch | 4-12 | Jan, 2023 |
| 4.4.6 Example: Normal Depth for Given Discharge in a Grass-Lined Road Ditch | 4-13 | Jan, 2023 |
| 4.4.7 Example: Discharge for Uniform Flow in an Aggregate-Lined Road Ditch | 4-13 | Jan, 2023 |
| 4.4.8 Example: Normal Depth for Given Discharge in an Aggregate-Lined Road Ditch | 4-15 | Jan, 2023 |
| 4.4.9 Superelevation in Bends | 4-15 | Jan, 2023 |
| 4.5 CHANNEL STABILITY | 4-17 | Jan, 2023 |
| 4.6 DESIGN OF ROAD DITCHES WITH GRASS LININGS | 4-20 | Jan, 2023 |
| 4.6.1 Procedure | 4-20 | Jan, 2023 |
| 4.6.2 Example: Design if Road Ditch with Aggregate Lining | 4-21 | Jan, 2023 |
| 4.7 DESIGN OF ROAD DITCHES WITH AGGREGATE LINING | 4-25 | Jan, 2023 |
| 4.7.1 Procedure | 4-25 | Jan, 2023 |
| 4.7.2 Example: Design of Road Ditch with Aggregate Lining | 4-26 | Jan, 2023 |
| 4.7.3 Rates of Application | 4-28 | Jan, 2023 |
| 4.8 DESIGN OF ROAD DITCHES WITH CONCRETE LININGS | 4-30 | Jan, 2023 |
| 4.8.1 Procedure | 4-30 | Jan, 2023 |
| 4.8.2 Example: Design of Road Ditch with Concrete Lining | 4-30 | Jan, 2023 |
| 4.9 REFERENCES | 4-32 | Jan, 2023 |
| 5.0 MEDIAN DRAINAGE | 5-1 | Jan, 2023 |
| 5.1 TYPES OF MEDIAN DRAINS | 5-2 | Jan, 2023 |
| 5.2 DESIGN CRITERIA | 5-3 | Jan, 2023 |
| 5.2.1 Allowable Water Surface | 5-3 | Jan, 2023 |
| 5.2.3 Recurrence Interval | 5-3 | Jan, 2023 |
| 5.2.4 Median Cross Section and Depth | 5-3 | Jan, 2023 |
| 5.2.5 Temporary Erosion Protection | 5-3 | Jan, 2023 |
| 5.3 CAPACITY OF MEDIAN DRAINS | 5-5 | Jan, 2023 |
| 5.4 DESIGN PROCEDURE FOR MEDIAN DRAINAGE | 5-10 | Jan, 2023 |
| 5.4.1 Example: Design of Median Drainage | 5-10 | Jan, 2023 |
| 6.0 CULVERTS | 6-1 | Jan, 2023 |
| 6.1 TYPES OF CULVERTS | 6-2 | Jan, 2023 |
| 6.1.1 Culvert Shapes | 6-2 | Jan, 2023 |
| 6.1.2 Reinforced Concrete Boxes | 6-2 | Jan, 2023 |
| 6.1.3 Multiple Barrel Culverts | 6-2 | Jan, 2023 |
| 6.1.4 End Treatments | 6-2 | Jan, 2023 |
| 6.1.4.1 End Sections for Pipe Culverts | 6-3 | Jan, 2023 |
| 6.1.4.2 End Treatments for Box Culverts | 6-4 | Jan, 2023 |
| 6.1.5 Embedded Culverts | 6-5 | Jan, 2023 |
| 6.2 ALIGNMENT OF CULVERTS | 6-6 | Jan, 2023 |
| 6.2.1 Horizontal Alignment | 6-6 | Jan, 2023 |
| 6.2.2 Grade | 6-8 | Jan, 2023 |
| 6.2.3 Embedment Culverts | 6-8 | Jan, 2023 |
| 6.2.4 Hydraulic Geometry of Embedded Culverts | 6-11 | Jan, 2023 |
| 6.3 HYDRAULIC ANALYSIS OF CULVERTS | 6-11 | Jan, 2023 |
| 6.3.1 Types of Flow in Culverts | 6-11 | Jan, 2023 |
| 6.3.2 General Procedure for Culvert Analysis | 6-13 | Jan, 2023 |
| 6.3.3 Tailwater Level | 6-13 | Jan, 2023 |
| 6.3.4 Outlet Control | 6-13 | Jan, 2023 |
| 6.3.4.1 Example: Culvert Analysis for Outlet Control | 6-23 | Jan, 2023 |
| 6.3.5 Inlet Control | 6-27 | Jan, 2023 |
| 6.3.5.1 Pipe Culverts | 6-27 | Jan, 2023 |
| 6.3.5.2 Example: Analysis of Pipe Culvert for Inlet Control | 6-35 | Jan, 2023 |
| 6.3.5.3 Example: Embedded Pipe Culvert under Inlet Control | 6-35 | Jan, 2023 |
| 6.3.5.4 Example: Analysis of an RCB Culvert for Inlet Control | 6-38 | Jan, 2023 |
| 6.3.6 Use of Computer Programs for Culvert Analysis | 6-38 | Jan, 2023 |
| 6.4 DESIGN OF CULVERTS FOR PEAK FLOW | 6-40 | Jan, 2023 |
| 6.5 ANALYSIS AND DESIGN OF CULVERTS FOR DETENTION STORAGE | 6-42 | Jan, 2023 |
| 6.5.1 Example: Detention Storage Analysis of a Culvert | 6-43 | Jan, 2023 |
| 6.6 SCOUR PROTECTION AT CULVERT OUTLETS | 6-48 | Jan, 2023 |
| 6.7 REFERNCES | 6-49 | Jan, 2023 |
| 7.0 URBAN DRAINAGE | 7-1 | Jan, 2023 |
| 7.1 STREET DRAINAGE | 7-2 | Jan, 2023 |
| 7.1.1 Design Criteria | 7-2 | Jan, 2023 |
| 7.1.2 Types of Inlets | 7-2 | Jan, 2023 |
| 7.1.3 Location Inlets | 7-3 | Jan, 2023 |
| 7.1.4 Discharge Capacity of Gutter and Street | 7-3 | Jan, 2023 |
| 7.1.5 Capacity of Inlets on Grade | 7-5 | Jan, 2023 |
| 7.1.6 Capacity of Inlets in Sag Locations | 7-10 | Jan, 2023 |
| 7.1.7 Discharge for Inlet Design | 7-11 | Jan, 2023 |
| 7.1.8 Example: Design of Street Drainage | 7-11 | Jan, 2023 |
| 7.2 STORM SEWER | 7-15 | Jan, 2023 |
| 7.2.1 Design Criteria | 7-15 | Jan, 2023 |
| 7.2.2 System Layout | 7-15 | Jan, 2023 |
| 7.2.3 Preliminary Design | 7-15 | Jan, 2023 |
| 7.2.4 Hydraulic Grade Line and Final Design | 7-17 | Jan, 2023 |
| 7.2.5 Example: Design of a Storm Sewer | 7-19 | Jan, 2023 |
| 7.3 REFERENCES | 7-26 | Jan, 2023 |
| 8.0 STRUCTURAL ASPECTS OF CULVERTS | 8-1 | Jan, 2023 |
| 8.1 PIPE INSTALLATION | 8-2 | Jan, 2023 |
| 8.1.1 General Procedure | 8-2 | Jan, 2023 |
| 8.1.2 Minimum Spacing | 8-2 | Jan, 2023 |
| 8.1.3 Pipe Lengths | 8-2 | Jan, 2023 |
| 8.2 REINFORCED CONCRETE PIPE | 8-3 | Jan, 2023 |
| 8.3 CORRUGATED METAL PIPE | 8-5 | Jan, 2023 |
| 8.4 CORRUGATED ALUMINUM PIPE | 8-23 | Jan, 2023 |
| 8.5 THERMOPLASTIC PIPE | 8-35 | Jan, 2023 |
| 8.6 REINFORCED CONCRETE BOXES | 8-36 | Jan, 2023 |
| 8.7 REFERENCES | 8-38 | Jan, 2023 |
| INDEX | Index-I | Jan, 2023 |
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