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Storm Drainage Design & Technical Criteria

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Storm Drainage Design & Technical Criteria CITY AND COUNTY OF DENVER STORM DRAINAGE DESIGN & TECHNICAL CRITERIA Department of Public Works Wastewater Management Division Engineering Division Revised January 2006 This page intentionally left blank. STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA PREFACE Relationship to Previous Versions of Denver Storm Drainage Criteria Manual This Denver Storm Drainage Design and Technical Criteria Manual (DENVER CRITERIA) updates and supersedes the previous Denver Storm Drainage Criteria Manual, as published in 1992. A few noteworthy changes include: November 2013 revision amends Chapter 4: • Wholesale revision to this chapter to incorporate revised floodplain ordinance which was passed by City Council on November 4, 2013. April 2013 revision amends Chapters 1, 14, and 15: • The DENVER CRITERIA are adopted as a part of the Manager’s Rules and Regulations Governing Sewerage Charges and Fees and Management of Wastewater, having been adopted and incorporated by reference in the April 2013 revised Sewerage Regulation. • Revisions to definitions of types of projects and inclusion of Linear Projects (Construction, Rehab, and Maintenance) definitions. These new definitions are applicable for water quality only. • Revised BMP requirements depending on type of project. Linear Construction Projects require post- construction water quality best management practices per Table 14.3, whereas Linear Rehabilitation & Linear Maintenance Projects do not require water quality. • Inclusion of option for regional and subregional water quality treatment, pending completion of pilot project and program approval from the Colorado Department of Public Health and Environment (CDPHE). • Inclusion of maintenance requirements for water quality facilities. • Replace references to “Erosion & Sediment Control Permit” with “Construction Activities Stormwater Discharge Permit (CASDP)” and revises associated requirements in accordance with current Construction Activities Stormwater Manual (CASM). • Additional cross-referencing to the Urban Drainage and Flood Control District (UDFCD) Urban Storm Drainage Criteria Manual, Volumes 1-3 (DISTRICT MANUAL) as updated in 2001 and 2010 and as 11/2013 PRE-1 City and County of Denver STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA PREFACE may be periodically amended. Some of the cross-references are adopted and incorporated by reference into the DENVER CRITERIA; others are referenced only as guidance. • Consolidate into chapter 15 (from various other documents previously published by the department) the requirements for construction site stormwater management and erosion control. January 2006 revision: • Extensive cross-referencing to the Urban Drainage and Flood Control District (UDFCD) Urban Storm Drainage Criteria Manual, Volumes 1-3 (DISTRICT MANUAL) as updated in 2001 and as may be periodically amended. This has resulted in removal of many equations, tables, figures, and text from these DENVER CRITERIA and significant revision of all chapters. The purpose of this change is to ensure that the DENVER CRITERIA remain consistent with the DISTRICT MANUAL as technical changes are made to the DISTRICT MANUAL in the future and to eliminate unnecessary redundancy between the manuals. • New inlet and street capacity charts. • New details for detention and water quality facilities. • New emphasis on stormwater quality and construction requirements to reflect Colorado Discharge Permit System (CDPS) requirements. • Revised drainage and construction plan submittal checklists to improve user friendliness for developers and their engineers. • Addition of an appendix describing commonly encountered problems to help avoid common pitfalls. 11/2013 PRE-2 City and County of Denver STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA PREFACE Acknowledgements The City and County of Denver acknowledges and thanks the following individuals and organizations for their contributions to this manual. Denver Public Works Department Saeed Farahmandi, P.E., Co-project Director Ted Christianson, P.E. Alan Sorrel, P.E. Lynn Brown-Jones Terry Baus, P.E. Kevin Lewis, P.E. Dave Stever Urban Drainage and Flood Control District Ben Urbonas, P.E., Co-project Director Ken Mackenzie, P.E., Project Engineer Wright Water Engineers, Inc., Consultant Team Jonathan Jones, P.E., Project Manager Jane Clary, Project Coordinator/Technical Editor T. Andrew Earles, P.E., Ph.D. David W. Foss, P.E. Kurt Loptien, Drafting Joe J. Nye, P.E. James C.Y. Guo, P.E., Ph.D. This manual relies significantly on work previously completed by others in several existing storm drainage manuals including: Urban Storm Drainage Criteria Manual, Volumes 1-3 (UDFCD 1999, 2001, 2010) Denver Water Quality Management Plan (WWE et al. 2004) Draft Arapahoe County Storm Drainage Criteria Manual (Muller Engineering 2005) Draft Douglas County Storm Drainage Criteria Manual (Muller Engineering 2005) 11/2013 PRE-3 City and County of Denver STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA PREFACE This page intentionally left blank. 11/2013 PRE-4 City and County of Denver STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA PREFACE Acronyms BMP Best Management Practice CAP Corrugated Aluminum Pipe CASDP Construction Activities Stormwater Discharge Permit CASM Construction Activities Stormwater Manual CDOT Colorado Department of Transportation CDPS Colorado Discharge Permit System cfs cubic feet per second CDPHE Colorado Department of Public Health and Environment CLOMR Conditional Letter of Map Revision CMP Corrugated Metal Pipe CUHP Colorado Urban Hydrograph Procedure CWCB Colorado Water Conservation Board EGL Energy Grade Line FEMA Federal Emergency Management Agency FHAD Flood Hazard Area Delineation FHWA Federal Highway Administration FIRM Flood Insurance Rate Map ft feet ft/sec feet per second HGL Hydraulic Grade Line IBC International Building Code in inches LID Low Impact Development LOMR Letter of Map Revision MDCIA Minimizing Directly Connected Impervious Area MS4 Municipal Separate Storm Sewer System NOAA National Oceanic and Atmospheric Administration NRCS Natural Resources Conservation Service RCP Reinforced Concrete Pipe ROW Right-of-Way SEO State Engineer’s Office SWMM Stormwater Management Model SWMP Stormwater Management Plan UDFCD Urban Drainage and Flood Control District WQCV Water Quality Capture Volume 11/2013 PRE-5 City and County of Denver STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA PREFACE This page intentionally left blank. 11/2013 PRE-6 City and County of Denver STORM DRAINAGE DESIGN AND TECHNICAL CRITERIA TABLE OF CONTENTS Table of Contents RELATIONSHIP TO PREVIOUS VERSIONS OF DENVER STORM DRAINAGE CRITERIA MANUAL .... PRE-1 ACKNOWLEDGEMENTS ............................................................................................................................ PRE-3 ACRONYMS ................................................................................................................................................ PRE-5 1.0 GENERAL PROVISIONS ............................................................................................................... GEN-1 1.1 Short Title .......................................................................................................................... GEN-1 1.2 Jurisdiction ........................................................................................................................ GEN-1 1.3 Purpose and Effect ........................................................................................................... GEN-1 1.4 Enactment Authority .......................................................................................................... GEN-2 1.5 Amendment and Revisions ............................................................................................... GEN-2 1.6 Enforcement Responsibility .............................................................................................. GEN-2 1.7 Review and Approval ........................................................................................................ GEN-2 1.8 Interpretation ..................................................................................................................... GEN-3 1.9 Additional Standards ......................................................................................................... GEN-3 1.10 Waivers and Variances ..................................................................................................... GEN-4 1.11 Use of Modeling Software and Design Spreadsheets ...................................................... GEN-5 2.0 DRAINAGE REPORT AND CONSTRUCTION DRAWING SUBMITTAL REQUIREMENTS ......... SUB-1 2.1 Introduction ....................................................................................................................... SUB-1 2.2 Review Process ................................................................................................................ SUB-1 2.2.1 Subdivision Process ............................................................................................ SUB-1 2.2.2 Permit Process .................................................................................................... SUB-1 2.2.3 Pre-application Conference ................................................................................. SUB-1 2.2.4 Review by Referral Agencies .............................................................................. SUB-1 2.2.5 Stand-alone Drainage Report.............................................................................. SUB-2 2.2.6 Submittal Adequacy
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