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Drainage Design Manual

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Drainage Design Manual DRAINAGE DESIGN MANUAL The Drainage Design Manual dated March 2021 replaces the previous version dated March 2020. Major Highlight Revisions • Article 1.3: Revised various definitions. • Article 5.2: Revised the source of precipitation data from Frequency Distributions of Heavy Precipitation in Illinois: Updated Bulletin 70 published in 2019, to Precipitation Frequency Study for Illinois (ISWS Bulletin 75) published in 2020. • Article 5.2: Revised the source of rainfall distributions from Frequency Distributions of Heavy Precipitation in Illinois: Spatio-Temporal Analysis published in 2019, to Precipitation Frequency Study for Illinois (ISWS Bulletin 75) published in 2020. • Article 6.3: Noted that the minimum recommended mat width is 3 times the pipe diameter or equal to the downstream width of the headwall, whichever is greater. • Table 6.1: Noted that the ditch freeboard requirement does not apply to swales that drain grassed areas within the ROW, have a flow depth less than 6 inches and are drained by catch basins. • Article 9.3: Noted that in situations where the two openings in a restrictor manhole cannot be located within the gutter area due to conflict with an adjacent retaining wall or noise wall, a rectangular structure with restrictor (M-DRN-604) shall be used. • Article 9.4: Noted that permanent erosion control measures such as turf reinforcement mat and open cell articulated concrete blocks or a drainage structure not accessible to traffic shall be used for embankment slope protection from bypass flow where no gutter is present at the end of the parapet. • Article 9.10: Noted that drainage structures to be utilized during construction staging shall be secured if traversed by vehicles and permanent drainage structures utilized during staging shall be cleaned prior to project completion. Also noted that special attention shall be given to crossover locations and gore areas during construction staging. • Article 10.6: Noted that a minimum 8-ft diameter restrictor manhole shall be used if the control structure is the only feasible emergency overflow outlet for a detention basin. • Article 15: Revised letters P and Q to have the updated name of the references. MARCH 2021 | ILLINOIS TOLLWAY | i DRAINAGE DESIGN MANUAL TABLE OF CONTENTS SECTION 1.0 INTRODUCTION ______________________________________________ 1 1.1 Purpose and Use ______________________________________________________ 1 1.2 Abbreviations & Acronyms _______________________________________________ 2 1.3 Definitions ___________________________________________________________ 3 SECTION 2.0 DRAINAGE POLICIES ________________________________________ 13 2.1 General Considerations ________________________________________________ 13 2.2 Governing Requirements within Multiple Jurisdictions _________________________ 14 2.3 Coordination with Other Regulatory Agencies _______________________________ 15 2.4 Analysis Procedures __________________________________________________ 15 SECTION 3.0 FLOODWAY/FLOODPLAIN ENCROACHMENTS ________________ 17 3.1 General Considerations ________________________________________________ 17 3.2 Method of Analysis ___________________________________________________ 17 SECTION 4.0 WATER QUALITY ____________________________________________ 19 4.1 General Considerations ________________________________________________ 19 4.2 Stormwater Quality Design _____________________________________________ 19 4.3 Application of Best Management Practices _________________________________ 21 SECTION 5.0 HYDROLOGY ________________________________________________ 23 5.1 General Considerations ________________________________________________ 23 5.2 Method of Analysis ___________________________________________________ 23 SECTION 6.0 DITCH AND CHANNEL DESIGN _______________________________ 25 6.1 General Considerations ________________________________________________ 25 6.2 Hydraulic Design _____________________________________________________ 25 6.3 Erosion Control in Ditches ______________________________________________ 25 6.3.1 Articulated Concrete Block Revetment Systems ______________________________ 27 6.3.2 Bioswales ____________________________________________________________ 28 6.3.3 Furrows ______________________________________________________________ 29 6.4 Typical Ditch Sections _________________________________________________ 31 6.5 Watercourse Confluences ______________________________________________ 31 SECTION 7.0 CULVERT DESIGN ___________________________________________ 33 7.1 General Considerations ________________________________________________ 33 7.2 Hydraulic Design _____________________________________________________ 33 7.3 Culvert Lining _______________________________________________________ 35 7.4 Installation of Culverts _________________________________________________ 35 MARCH 2021 | ILLINOIS TOLLWAY | ii DRAINAGE DESIGN MANUAL 7.5 Special Installations of Culverts __________________________________________ 35 7.6 Culvert End Treatment ________________________________________________ 37 SECTION 8.0 BRIDGE HYDRAULICS ________________________________________ 39 8.1 General Considerations ________________________________________________ 39 8.2 Hydraulic Design _____________________________________________________ 39 8.3 Site Inspection and Bridge Survey ________________________________________ 39 8.4 Backwater Analysis ___________________________________________________ 41 8.5 Scour Analysis _______________________________________________________ 41 SECTION 9.0 ROADWAY DRAINAGE DESIGN _______________________________ 44 9.1 General Considerations ________________________________________________ 44 9.2 Roadway Profile _____________________________________________________ 44 9.3 Pavement Drainage ___________________________________________________ 44 9.4 Bridge Decks ________________________________________________________ 45 9.5 Medians and Shoulders ________________________________________________ 46 9.5.1 General Design Requirements ____________________________________________ 46 9.5.2 Grassed Medians ______________________________________________________ 46 9.5.3 Paved Medians ________________________________________________________ 46 9.6 Longitudinal Drainage Conveyance _______________________________________ 46 9.6.1 General Design Requirements ____________________________________________ 46 9.6.2 Gore Areas ___________________________________________________________ 47 9.6.3 Retaining Walls ________________________________________________________ 47 9.7 Subsurface Drainage __________________________________________________ 48 9.7.1 Farm Tiles ____________________________________________________________ 48 9.7.2 Subsurface Drains (Pipe Underdrains) ______________________________________ 48 9.8 Storm Sewer Design __________________________________________________ 49 9.9 Drainage Structures___________________________________________________ 53 9.10 Temporary Drainage __________________________________________________ 54 SECTION 10.0 STORMWATER DETENTION STORAGE ________________________ 58 10.1 General Considerations ________________________________________________ 58 10.2 Perforated Stand Pipes ________________________________________________ 58 10.3 Design Requirements _________________________________________________ 58 10.4 Dry Basins and Wet Basins _____________________________________________ 61 10.4.1 Diverse Hydrologic Zones in Detention Ponds ________________________________ 62 10.5 Detention in Ditches and in Median Areas __________________________________ 63 10.6 Detention in Storm Sewer Pipes _________________________________________ 63 10.7 Sedimentation in Detention Basins or Ditches _______________________________ 65 SECTION 11.0 TOLL PLAZAS, OASES AND MAINTENANCE FACILITIES ________ 67 11.1 General Considerations ________________________________________________ 67 MARCH 2021 | ILLINOIS TOLLWAY | iii DRAINAGE DESIGN MANUAL 11.2 Hydraulic Design _____________________________________________________ 67 SECTION 12.0 SOIL EROSION AND SEDIMENT CONTROL ____________________ 69 12.1 General Considerations ________________________________________________ 69 12.2 Erosion and Sediment Control Design _____________________________________ 69 SECTION 13.0 PUMP STATION DESIGN _____________________________________ 70 13.1 General Considerations ________________________________________________ 70 13.2 Design Requirements _________________________________________________ 70 SECTION 14.0 SUBMITTAL REQUIREMENTS ________________________________ 72 14.1 General Considerations ________________________________________________ 72 14.2 Pre-Concept Phase (Master Plan) ________________________________________ 73 14.3 Concept Phase ______________________________________________________ 73 14.4 Preliminary Plans and Special Provisions Phase _____________________________ 76 14.4.1 Preliminary Plan Submittal _______________________________________________ 76 14.4.2 Pre-Final Plan Submittal _________________________________________________ 77 SECTION 15.0 SELECTED REFERENCES _____________________________________ 80 APPENDIX A. ILLINOIS TOLLWAY DRAINAGE DESIGN CRITERIA SUMMARY __ 83 APPENDIX B. HYDROLOGIC / HYDRAULIC COMPUTATION MODELS (B1 AND B2)98 APPENDIX C. BMP DECISION FLOW CHART _______________________________ 105 APPENDIX D. ILLINOIS TOLLWAY STANDARD STRUCTURE APPLICATIONS _ 107 APPENDIX E. ILLINOIS TOLLWAY STANDARD HEADWALLS AND SLOPED HEADWALLS _______________________________________________ 112 APPENDIX F. SCOPE OF CONCEPT DRAINAGE
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