Table of Contents - San Antonio

Storm Water Design Criteria Manual January 2016

Table of Contents

Table of Contents ......................................................................................................................................... i FIGURES............ ........................................................................................................ xvii TABLES.... ...................................................................................................................... xx

Chapter 1 INTRODUCTION ................................................................................................................. 1.1 1.1 Preface ............................................................................................................................. 1.1 1.2 Acronyms And Abbreviations ......................................................................................... 1.1

Chapter 2 DRAINAGE POLICY ........................................................................................................... 2.1 2.1 Introduction...................................................................................................................... 2.1 2.2 Statement Of Policy ......................................................................................................... 2.1 2.3 Principles ......................................................................................................................... 2.2 2.4 Basic Knowledge ............................................................................................................. 2.2 2.5 Planning ........................................................................................................................... 2.2 2.6 Technical Criteria ............................................................................................................ 2.3 2.7 Floodplain Management .................................................................................................. 2.3 2.8 Implementation ................................................................................................................ 2.3 2.9 References........................................................................................................................ 2.4

Chapter 3 DRAINAGE LAW ................................................................................................................. 3.1 3.1 INTRODUCTION ........................................................................................................... 3.1 3.2 FEDERAL LAWS AND REGULATIONS..................................................................... 3.1 3.2.1 The Code of Federal Regulations ....................................................................... 3.1 3.2.2 National Flood Insurance Program ..................................................................... 3.1 3.2.3 National Environmental Policy Act .................................................................... 3.1 3.2.4 Rivers And Harbors Act ..................................................................................... 3.1 3.2.5 The Federal Water Pollution Control Act ........................................................... 3.1 3.2.6 Section 402 of the CWA ..................................................................................... 3.2 3.2.7 Section 404 of the CWA ..................................................................................... 3.2 3.2.8 Endangered Species Act (ESA) .......................................................................... 3.2 3.3 STATE STATUTES AND RULES................................................................................. 3.2 3.3.1 Texas Water Code ? Section 11.086................................................................... 3.2

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Storm Water Design Criteria Manual January 2016

3.3.2 Texas Water Code ? Section 16.236................................................................... 3.3 3.3.3 Texas Commission on Environmental Quality ? Chapter 213 .......................... 3.3 3.3.4 Texas Commission on Environmental Quality ? Chapter 299 ......................... 3.3 3.4 LOCAL CODES/ORDINANCES/COURT ORDERS .................................................... 3.3 3.4.1 City of San Antonio Texas Unified Development Code..................................... 3.3 3.4.2 City of San Antonio Flood Plain Ordinance 57969 ............................................ 3.3 3.4.3 Bexar County Flood Damage Prevention ........................................................... 3.3 3.4.4 Aquifer Protection Ordinance 81491 .................................................................. 3.3 3.4.5 (Ord. No. 97568 ? 2) Storm Water Management Plan Checklist ....................... 3.4 3.4.6 (Ord. No. 2006-11-30-1333, ? 2, 11-30-06) Maintenance.................................. 3.4 3.4.7 (Ord. No. 2009-08-20-0661, ? 3, 8-20-09) Amendments to Chapter 19 and 35 3.4 3.4.8 Ordinance No. 2010-11-18-0985 ........................................................................ 3.4 3.4.9 (Ord. No. 2013-01-31-0074) Amending FILO Ordinance of 1997 .................... 3.4 3.4.10 (Ord. No. 2014-06-19-0472) Amendments to Chapter 34.................................. 3.4 Chapter 4 PLANNING ............................................................................................................................ 4.1 4.1 Introduction...................................................................................................................... 4.1 4.2 Regional Drainage Master Plan (Watershed Master Plan) .............................................. 4.1 4.3 Regional Storm Water Management Program (RSWMP) ............................................... 4.2 4.3.1A RSWMP Overview ............................................................................................. 4.2 4.3.1B RSWMP Participation......................................................................................... 4.2 4.3.1C Adverse Impact ................................................................................................... 4.3 4.3.1D Fee In Lieu Of..................................................................................................... 4.5 4.3.2 System Criteria ................................................................................................... 4.5 4.3.3 Responsibility to Accept Storm Water ............................................................... 4.5 4.3.4 Positive Overflow Pathways ............................................................................... 4.5 4.3.5 Maintenance........................................................................................................ 4.5 4.3.6 Inspection............................................................................................................ 4.6 4.3.7 New Development .............................................................................................. 4.6 4.3.8 Redevelopment ................................................................................................... 4.6 4.3.9 Low Impact Development .................................................................................. 4.6 4.4 Subdivision/Development................................................................................................ 4.6

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Storm Water Design Criteria Manual January 2016

4.4.1 Major Plat ........................................................................................................... 4.6 4.4.2 Minor Plat ........................................................................................................... 4.7 4.4.3 Replat .................................................................................................................. 4.7 4.4.4 Amending Plat .................................................................................................... 4.7 4.4.5 Master Development Plan (MDP) ...................................................................... 4.7 4.4.6 Planned Unit Development (PUD) ..................................................................... 4.7 4.4.7 Enclave ............................................................................................................... 4.8 4.4.8 Master Plan Community District (MPCD) ......................................................... 4.8 4.4.9 Master Development Pattern Plan (MDPP) ........................................................ 4.8 4.4.10 Inner City Reinvestment/Infill Policy (ICRIP) ................................................... 4.8 4.4.11 Infill Development Zone (IDZ) .......................................................................... 4.8 4.4.12 Redevelopment Projects ..................................................................................... 4.8 4.5 Planning For The Floodplain ........................................................................................... 4.9 4.6 Planning For Drainage Systems....................................................................................... 4.9 4.6.1 Storm Water Management Plan Checklist ........................................................ 4.10 4.7 Planning For Storage ..................................................................................................... 4.10 4.8 Planning For Transportation .......................................................................................... 4.11 4.9 Planning For Open Space .............................................................................................. 4.11 4.10 Planning For LID ........................................................................................................... 4.11 4.11 Planning For Dams ........................................................................................................ 4.11 4.12 Maintenance Standards .................................................................................................. 4.12 4.13 References...................................................................................................................... 4.14 Chapter 5 HYDROLOGY....................................................................................................................... 5.1 5.1 Introduction...................................................................................................................... 5.1 5.2 Method of Analysis.......................................................................................................... 5.1 5.2.1 Basin Delineation................................................................................................ 5.1 5.2.2 Selection of Rational or Hydrograph Method..................................................... 5.2 5.2.3 Selection of Method for Detention Ponds........................................................... 5.2 5.3 Rational Method .............................................................................................................. 5.3 5.4 Time of Concentration ..................................................................................................... 5.3 5.4.1 Overland Flow .................................................................................................... 5.3

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Storm Water Design Criteria Manual January 2016

5.4.2 Shallow Concentrated Flow................................................................................ 5.6 5.4.3 Channel Flow...................................................................................................... 5.8 5.5 Rainfall Data .................................................................................................................... 5.8 5.5.1 Rainfall Intensity-Duration ................................................................................. 5.8 5.5.2 Rainfall Depth-Duration-Frequency ................................................................. 5.10

5.5.2.1 Design Rainfall.............................................................................. 5.10 5.5.2.2 Areal Reduction Factor ................................................................. 5.10 5.5.3 Runoff Coefficient ............................................................................................ 5.12 5.6 Hydrograph Method....................................................................................................... 5.12 5.6.1 Sub-Basin.......................................................................................................... 5.12 5.6.1.1 Loss Method.................................................................................. 5.12

5.6.1.1.1 SCS Curve Number Loss........................................... 5.12 5.6.1.2 Transform Method......................................................................... 5.13

5.6.1.2.1 SCS Unit Hydrograph................................................ 5.13 5.6.1.2.2 Snyder Unit Hydrograph............................................ 5.15 5.6.1.2.3 Clark Unit Hydrograph .............................................. 5.16 5.6.1.3 Baseflow Method .......................................................................... 5.16 5.6.1.3.1 None........................................................................... 5.16 5.6.1.3.2 Constant Monthly Baseflow ...................................... 5.16 5.6.2 Reach ? Routing................................................................................................ 5.16 5.6.2.1 Muskingum ................................................................................... 5.17 5.6.2.2 Muskingum-Cunge 8 Point Cross Section .................................... 5.17 5.6.2.3 Modified Puls ................................................................................ 5.17 5.6.2.4 Kinematic Wave............................................................................ 5.17 5.7 Probable Maximum Flood ............................................................................................. 5.17 5.8 References...................................................................................................................... 5.18 Chapter 6 PAVEMENT DRAINAGE.................................................................................................... 6.1 6.1 Introduction...................................................................................................................... 6.1 6.2 Design Guidelines............................................................................................................ 6.1 6.2.1 Design Frequency and Spread ............................................................................ 6.1 6.2.1.1 Street Classification ? Primary and Secondary Arterial Streets ...... 6.1

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Storm Water Design Criteria Manual January 2016

6.2.1.2 Street Classification ? Local "B" and Collector Streets .................. 6.2 6.2.1.3 Street Classification ? Local "A" Streets ........................................ 6.2 6.2.1.4 Street Classification ? Alleys .......................................................... 6.3 6.2.1.5 Street Classification ? Traditional Street Design ............................ 6.3 6.2.2 Street Capacity.................................................................................................... 6.3 6.2.3 High Velocity Flow ............................................................................................ 6.6 6.2.4 Longitudinal Slope.............................................................................................. 6.6 6.2.4.1 Minimum......................................................................................... 6.6 6.2.4.2 Maximum ........................................................................................ 6.6 6.2.5 Cross Slope ......................................................................................................... 6.6 6.2.5.1 Minimum......................................................................................... 6.6 6.2.5.2 Maximum ........................................................................................ 6.6 6.2.6 Inverted Crown ................................................................................................... 6.7 6.2.6.1 Maximum Flow Depth .................................................................... 6.7 6.2.8 Flow In Sag ? Vertical Curves............................................................................ 6.7 6.2.9 Unflooded Public Road Access .......................................................................... 6.7 6.3 References........................................................................................................................ 6.7 Chapter 7 STORM DRAIN SYSTEMS ................................................................................................. 7.1 7.1 Introduction...................................................................................................................... 7.1 7.2 Hydraulics Of Storm Drainage Systems .......................................................................... 7.1 7.2.1 Flow Type Assumptions ..................................................................................... 7.1 7.2.2 Partial Flow vs. Pressure Flow ........................................................................... 7.1 7.2.3 Hydraulic Capacity ............................................................................................. 7.2 7.2.4 Hydraulic Grade Line and Energy Grade Line ................................................... 7.3 7.2.5 Storm Dain Inlets and Outfalls ........................................................................... 7.3 7.2.5.1 Inlets ................................................................................................ 7.3 7.2.5.2 Outfalls ............................................................................................ 7.3 7.2.6 Energy Losses ..................................................................................................... 7.4 7.2.6.1 Pipe Friction Losses ........................................................................ 7.4 7.2.6.2 Exit Losses ...................................................................................... 7.5 7.2.6.3 Bend Losses .................................................................................... 7.5

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