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Version 09-10-2019 Version 09-10-2019 Version 09-10-19 Table of Contents SECTION 1- GENERAL REQUIREMENT ............................................................................................ 1 1.01 Short Title .................................................................................................................................... 2 1.02 Interpretation ............................................................................................................................... 2 1.03 Enforcement ................................................................................................................................ 2 1.04 Amendment ................................................................................................................................. 2 1.05 Deviation Requests ...................................................................................................................... 2 1.06 Applicability ................................................................................................................................ 3 1.07 Other Local, State and Federal Environmental Regulations .......................................................... 3 1.08 Texas Accessibility Standards (TAS) ........................................................................................... 3 1.09 Engineering Criteria – Section Descriptions ................................................................................. 4 1.10 Submittal Requirements for Construction Plans ............................................................................ 5 1.11 Easements .................................................................................................................................... 7 1.12 Fees ............................................................................................................................................. 8 SECTION 2 – WATER & WASTEWATER DESIGN REQUIREMENTS .............................................. 9 2.1 Water System - General ............................................................................................................... 10 2.1.1 Water Main Location ............................................................................................................ 10 2.1.2 Horizontal and Vertical Alignment ........................................................................................ 10 2.1.3 Separation Distance between Water and Wastewater ............................................................. 11 2.1.4 Average Daily Water Demands ............................................................................................. 11 2.1.5 Water Main Sizing ................................................................................................................ 12 2.1.6 Water Main Materials............................................................................................................ 12 2.1.7 Water Services ...................................................................................................................... 14 2.1.8 Valves ................................................................................................................................... 14 2.1.9 Fire Hydrants ........................................................................................................................ 15 2.1.10 Connections to Existing Water Mains .................................................................................. 17 2.1.11 Backflow Prevention ........................................................................................................... 18 2.1.12 Automatic Flushing Valve ................................................................................................... 18 2.1.13 Water Meter Vault............................................................................................................... 18 2.1.14 Double Detector Check Fire Vaults and FDC ...................................................................... 19 2.1.15 Testing ................................................................................................................................ 20 Version 09-10-19 2.2 Wastewater System - General ...................................................................................................... 21 2.2.1 Wastewater Main Location .................................................................................................... 21 2.2.2 Horizontal and Vertical Alignment ........................................................................................ 21 2.2.3 Separation Distance between Wastewater and Water Mains ................................................... 22 2.2.4 Wastewater Flows ................................................................................................................. 23 2.5 Wastewater Main Materials ...................................................................................................... 24 2.2.6 Wastewater Main Sizing........................................................................................................ 25 2.2.7 Wastewater Service Laterals .................................................................................................. 25 2.2.8 Wastewater Service Clean-out ............................................................................................... 25 2.2.9 Manholes .............................................................................................................................. 26 2.2.10 Manhole Abandonment ....................................................................................................... 27 2.2.11 Inverted Siphons ................................................................................................................. 27 2.2.12 Wastewater Lift Stations ..................................................................................................... 28 2.2.13 Wet Well Design ................................................................................................................. 30 2.2.14 Pumps, Lift Station Piping and Valves ................................................................................. 32 2.2.15 Dumpster Enclosure Drains ................................................................................................. 36 2.03 Reclaimed Water System ........................................................................................................... 36 2.04 Easements .................................................................................................................................. 36 2.05 Thrust Restraint ......................................................................................................................... 37 2.06 Pavement Cut and Repair ........................................................................................................... 38 2.07 Trenchless Construction ............................................................................................................. 38 2.08 Crossings ................................................................................................................................... 38 2.09 Corrosion Protection .................................................................................................................. 40 2.10 Pipe Bollard ............................................................................................................................... 40 SECTION 3 – DRAINAGE DESIGN REQUIREMENTS ..................................................................... 41 3.01 General ...................................................................................................................................... 42 3.02 Determining Design Discharge................................................................................................... 42 3.03 Downstream Assessment............................................................................................................ 46 3.04 Street Capacity ........................................................................................................................... 48 3.05 Alley Capacity ........................................................................................................................... 48 3.06 Valley Gutters ............................................................................................................................ 48 3.07 Inlet Location and Capacity........................................................................................................ 49 3.08 Design of Enclosed Storm Sewer System ................................................................................... 56 Version 09-10-19 3.09 Detention/Retention Facility Design ........................................................................................... 62 3.10 Miscellaneous Drainage Requirements ....................................................................................... 64 3.11 Open Channel Design ................................................................................................................ 66 3.12 Hydraulic Design of Culverts ..................................................................................................... 69 3.13 Bridge Design Hydraulics .......................................................................................................... 70 3.14 Energy Dissipaters ....................................................................................................................
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