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Location & Design Manual, Volume 2

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Location & Design Manual, Volume 2 Ohio Department of Transportation Central Office • 1980 West Broad Street • Columbus, OH 43223 John Kasich, Governor • Jerry Wray, Director Date: January 18, 2019 To: All Current Holders of the Location and Design Manual, Volume 2 Re: Location and Design Manual, Volume Two Revisions Transmitted herewith are revisions to the Location and Design Manual, Volume 2. The following revisions have been made: • Revisions / Additions in Red • 1112.1 – Clarified need to consider local agency for sediment controls in combined sewer areas. • 1115.3 – Clarified that discharges must drain directly from ODOT right-of-way to a large river to prevent the requirement for quantity treatment BMPs. • 1115.4 – Updated the water quality volume (WQV) equation. • 1115.5 – Updated the water quality flow (WQF) equation and application to certain BMPs. • 1116.1 – Clarified the consideration of sheet flow drainage off of ODOT right-of-way in determining post-construction BMP requirements. • 1117.4 – Updated retention basin BMP design criteria. • 1118.2 – Updated guidance for hydraulic analysis using 2D models. • Figure 1115-1 – Deleted out of date water quality runoff coefficient figure. • Figure 1115-3 – Added duration/intensity table for use in the water quality flow calculation. • Figure 1117-6 – Update detention basin design example for updated water quality volume criteria. • Figure 1117-7 – Update retention basin design example for updated water quality volume criteria. • Sample Plan Note W104 – Clarified fixed typo. • Sample Plan Note W105 – Clarified fixed typo. The January 2019 update to this manual (ODOT’s L&D Volume 2) includes updates to the calculation of the water quality volume, water quality flow, and retention basin volume for post-construction BMPs based on updates to Ohio EPA’s construction general permit (OHC000005). These updates may increase the size of BMPs compared to design requirements in the July 2018 version of this manual. Projects that have either submitted Stage 2 design or finalized right-of-way acquisition for the project by January 31, 2019 may utilize the BMP design criteria from the July 2018 version of this manual. Projects that have not submitted Stage 2 design or finalized right-of-way acquisition for the project by January 31, 2019 must utilize the updated BMP design criteria included in this manual. Projects that have already completed preliminary or Stage 1 design for post-construction BMPs based on the July 2018 version of this manual, but not submitted Stage 2 design by January 31, 2019 must update the BMP design based on the current design criteria. The online revisions of the Location and Design Manual, Volume 2 can be found in PDF format at: http://www.dot.state.oh.us/Divisions/Engineering/Hydraulics/Pages/default.aspx An Equal Opportunity Employer Ohio Department of Transportation Central Office • 1980 West Broad Street • Columbus, OH 43223 John Kasich, Governor • Jerry Wray, Director Technical questions or recommended changes should be directed to Jeff Syar (614) 275-1373 or Matt Cozzoli (614) 466-3152. Respectfully, Jeff Syar, P.E. Office Administrator, Office of Hydraulic Engineering An Equal Opportunity Employer Notice To ensure proper receipt of future revisions to the manual, please visit the online Design Reference Resource at: http://www.dot.state.oh.us/drrc/Pages/default.aspx This manual is produced by the Office of Hydraulic Engineering. Technical questions, recommended changes, or suggestions should be sent to: Ohio Department of Transportation Attn: Jeffrey Syar, P.E. Administrator, Office of Hydraulic Engineering 1980 West Broad Street Columbus, Ohio 43223 (614) 275-1373 LOCATION AND DESIGN MANUAL VOLUME TWO DRAINAGE DESIGN The OHIO DEPARTMENT of TRANSPORTATION Table of Contents (Revised January 2019) Preface...........................................................................................................................................................i Ohio Counties...............................................................................................................................................iii Glossary of Terms........................................................................................................................................iv Design Reference Documents .....................................................................................................................ix 1000 Drainage Design Criteria 1001 Hydraulic Design Criteria................................................................................................................10-1 1001.1 Responsibilities...............................................................................................................10-1 1001.2 Natural Streams..............................................................................................................10-1 1001.3 Feasibility Study Activities ..............................................................................................10-1 1001.4 Highway Use Permits Design Considerations ................................................................10-1 1002 Pipe Criteria....................................................................................................................................10-1 1002.1 Introduction.....................................................................................................................10-1 1002.2 General Requirements ...................................................................................................10-2 1002.3 Conduit Types ................................................................................................................10-4 1003 Hydrology .......................................................................................................................................10-7 1003.1 Estimation of Magnitude and Frequency of Floods on Ohio Streams ............................10-7 1004 Flood Clearance .............................................................................................................................10-8 1004.1 General...........................................................................................................................10-8 1004.2 Design Year Frequency..................................................................................................10-8 1005 Highway Encroachments on Flood Plains......................................................................................10-8 1005.1 General...........................................................................................................................10-8 1005.2 Type of Studies.............................................................................................................10-11 1006 Allowable Headwater....................................................................................................................10-11 1006.1 Design Storm................................................................................................................10-11 1006.2 Culvert Headwater Controls .........................................................................................10-11 1006.3 Bridge Headwater Control ............................................................................................10-12 1006.4 Controls Specific to Flood Insurance Studies (FIS)......................................................10-13 1007 Pipe Removal Criteria...................................................................................................................10-13 1007.1 General.........................................................................................................................10-13 1007.2 Asbestos pipe ...............................................................................................................10-13 1008 Conduit Design Criteria ................................................................................................................10-14 1008.1 Corrugated and Spiral Rib Steel and Aluminum Pipes, and Corrugated Steel and Aluminum Pipe Arches .............................................................................................................10-14 1008.2 Rigid Pipe .....................................................................................................................10-15 1008.3 Thermoplastic Pipe.......................................................................................................10-15 1008.4 Corrugated Steel and Aluminum Box Culverts and Corrugated Steel Long Span Culverts. ..................................................................................................................................................10-15 1008.5 Precast Reinforced Concrete Box Culverts ..................................................................10-15 1008.6 Precast Reinforced Concrete Three-Sided Flat-Topped Culverts ................................10-16 1008.7 Precast Reinforced Concrete Arch Sections ................................................................10-16 1008.8 Precast Reinforced Concrete Round Sections .............................................................10-17 1008.9 Arch or Flat Slab Top Culvert Foundations ..................................................................10-18 1008.10 Bridge Foundations ....................................................................................................10-18 1008.11 Waterproofing Membrane...........................................................................................10-19
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