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HIGHWAY DESIGN MANUAL Chapter 8 Highway Drainage

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HIGHWAY DESIGN MANUAL Chapter 8 Highway Drainage HIGHWAY DESIGN MANUAL Chapter 8 Highway Drainage Revision 97 (Limited Revision) June 9, 2021 Issued by Engineering Bulletin 21-030 Effective with Design Approval on or after September 1, 2021 HIGHWAY DRAINAGE 8-2 Section Changes Throughout Reformatted chapter for legibility, updated document references, removed obsolete references, and incorporated hyperlinks. Exhibits renumbered to accommodate new exhibits in revised Section 8.6.1.1. §8.6.1.1 Allowable Section has been updated to meet guidance from the New York State Headwater Flood Risk Management Guidance for Implementation of the Community Risk and Resiliency Act. Exhibit 8-3 (formerly “Design Flood Frequencies (in years) for Drainage Structures and Table 8-2) Channels” table has been revised to reflect community risk and resiliency standards for local roads. Appendix 8B Appendix renamed to remove SPDES Permit number. Updated document references, removed obsolete references, and updated hyperlinks. Appendix 8B, Exhibit 1 Removed “Streambank restoration projects” as an example since they are no longer included in the SPDES Permit list of routine maintenance activities. Appendix 8B, Exhibit 3 Values revised to reflect 2015 Stormwater Design Manual updates. Appendix 8B §2.3.2.2.1 Kinderhook Lake watershed added to list of Phosphorus Restricted Watersheds Appendix 8B §2.3.2.5 Stormwater Management Design Manual page references corrected. Appendix 8B §2.3.2.7 Removed reference to inspections after rain events to reflect the current SPDES Permit and NYSDOT MURK 6 forms. Appendix 8B §2.4 (22) Removed reference to Draft NYSDOT Stormwater Management Practices Operation & Maintenance Manual (no longer on NYSDOT website) and replaced with reference to NYSDEC Maintenance Guidance for Stormwater Management Practices. Appendix 8B §2.5 Section updated to include NYSDEC’s electronic NOI submission process. EB 21-030 D.A. 09/01/2021 HIGHWAY DRAINAGE 8-3 TABLE OF CONTENTS INTRODUCTION ................................................................................................................................. 6 LEGAL ASPECTS OF HIGHWAY DRAINAGE ................................................................................. 7 8.2.1 State Drainage Law ....................................................................................................................... 7 8.2.3 Connections to State Drainage Facilities .................................................................................... 15 8.3 HYDROLOGY ................................................................................................................................... 18 8.3.1 Type of Project vs Extent of Hydrologic Analysis ........................................................................ 18 8.3.2 Hydrologic Analysis ..................................................................................................................... 19 8.4 HYDRAULIC PRINCIPLES ............................................................................................................... 30 8.4.1 Types of Open Channel Flow ...................................................................................................... 30 8.4.2 Energy of Flow ............................................................................................................................ 33 8.5 OPEN CHANNELS ........................................................................................................................... 34 8.5.1 Types of Open Channels ............................................................................................................ 34 8.5.2 Channel Design Criteria .............................................................................................................. 36 8.5.3 Hydraulics - Design and Analysis ................................................................................................ 38 8.5.4 Maintenance ................................................................................................................................ 41 8.6 CULVERTS ....................................................................................................................................... 42 8.6.1 Hydraulic Design Criteria ............................................................................................................ 42 8.6.2 Pipe Design Criteria .................................................................................................................... 51 8.6.3 Culvert Design - Overview .......................................................................................................... 59 8.6.4 Site Considerations ..................................................................................................................... 67 8.6.5 Maintenance ................................................................................................................................ 69 8.6.6 Safety - Roadside Design ........................................................................................................... 70 8.6.7 Rehabilitation of Culverts and Storm Drains ............................................................................... 71 8.7 STORM DRAINAGE SYSTEMS ....................................................................................................... 84 8.7.1 Planning and Coordination .......................................................................................................... 84 8.7.2 Hydrologic Analysis ..................................................................................................................... 85 8.7.3 Gutters ......................................................................................................................................... 86 8.7.4 Inlets ............................................................................................................................................ 87 8.7.5 Storm Drains ............................................................................................................................... 94 8.7.6 Drainage Structures .................................................................................................................. 104 8.7.7 Storage Facilities ....................................................................................................................... 110 8.7.8 Shared Costs ............................................................................................................................. 110 8.7.9 Maintenance .............................................................................................................................. 112 8.8 EROSION AND SEDIMENT CONTROL AND STORMWATER MANAGEMENT ......................... 113 8.8.1 Determining the Need for an Erosion and Sediment Control Plan and SPDES/NPDES Stormwater Permits .................................................................................................................. 113 8.8.2 Erosion and Sediment Control .................................................................................................. 115 8.8.3 SPDES General Permit for Stormwater Discharges from Construction Activity ....................... 120 8.8.4 NPDES Construction General Permit ....................................................................................... 121 8.8.5 MS4 Stormwater Outfall Inventory Mapping ............................................................................. 122 8.9 DRAINAGE REPORT ..................................................................................................................... 123 8.9.1 Introduction ................................................................................................................................ 123 8.9.2 Hydrology .................................................................................................................................. 123 8.9.3 Open Channels ......................................................................................................................... 123 8.9.4 Culverts ..................................................................................................................................... 124 8.9.5 Storm Drainage Systems .......................................................................................................... 124 8.9.6 Erosion and Sediment Control and Stormwater Management ................................................. 124 8.9.7 Special Considerations ............................................................................................................. 125 8.9.8 References ................................................................................................................................ 125 8.10 PLANS AND SPECIFICATIONS .................................................................................................... 126 8.10.1 Plans ......................................................................................................................................... 126 8.10.2 Specifications ............................................................................................................................ 128 8.10.3 Special Notes ............................................................................................................................ 129 EB 21-030 D.A. 09/01/2021 HIGHWAY DRAINAGE 8-4 8.11 DRAINAGE SOFTWARE ................................................................................................................ 130 8.12 REFERENCES ...............................................................................................................................
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