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STATE OF FLORIDA DEPARTMENT OF TRANSPORTATION

STATE OF FLORIDA DEPARTMENT OF TRANSPORTATION

DRAINAGE MANUAL

OFFICE OF DESIGN, DRAINAGE SECTION TALLAHASSEE, FLORIDA

January 2009

Topic No. 625-040-002-b Drainage Manual

Effective: January 2005 Revised January 2008

TABLE OF CONTENTS
Chapter 1 Introduction.................................................................................................... 4 1.1 Purpose ........................................................................................... 4 1.2 Authority .......................................................................................... 4 1.3 Scope .............................................................................................. 4 1.4 General........................................................................................... 4 1.5 Drainage Manual Organization ....................................................... 5 1.5.1 Background ...................................................................... 5 1.5.2 Appendices ...................................................................... 5 1.6 Distribution...................................................................................... 6 1.7 Procedure for Revisions and Updates............................................. 6 1.8 Training ........................................................................................... 7 1.9 Forms Access ................................................................................. 7 Chapter 2 Open Channel............................................................................................... 9 2.2 Design Frequency ........................................................................... 9 2.3 Hydrologic Analysis ....................................................................... 10 2.4 Hydraulic Analysis ......................................................................... 10 2.4.1 Manning's "n" Values..................................................... 10 2.4.2 Slope.............................................................................. 11 2.4.3 Channel Linings and Velocity ......................................... 11 2.4.4 Limitations on Use of Linings ......................................... 11 2.5 Construction and Maintenance Considerations ............................. 12 2.6 Safety............................................................................................ 12 2.6.1 Protective Treatment...................................................... 12 2.6.2 Roadside Safety............................................................. 12 2.7 Documentation .............................................................................. 12 Chapter 3 Storm Drain Hydrology and Hydraulics........................................................ 16 3.1 Introduction ................................................................................... 16 3.2 Pipe Materials ............................................................................... 16 3.3 Design Frequency ......................................................................... 16 3.4 Design Tailwater........................................................................... 17 3.5 Hydrologic Analysis ....................................................................... 18 3.5.1 Time of Concentration .................................................... 18 3.6 Hydraulic Analysis ......................................................................... 18 3.6.1 Pipe Slopes.................................................................... 18 3.6.2 Hydraulic Gradient ......................................................... 18 3.6.3 Outlet Velocity ................................................................ 19 3.6.4 Manning's Roughness Coefficients ................................ 19
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Topic No. 625-040-002-b Drainage Manual

Effective: January 2005 Revised January 2008

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