Stormwater Design Manual TABLE OF CONTENTS

Transcription

1 Page i TABLE OF CONTENTS BOOK 1 MANUAL OF SPECIFICATIONS STANDARDS AND DESIGN FRONT COVER SHEET FORWARD NOTICE OF COPYRIGHT PROTECTION PAGE STANDARD SPECIFICATIONS MEASUREMENT & PAYMENT (CITY FUNDED PROJECTS) 1.1 TRENCHING, BACKFILLING AND COMPACTION OF UTILITIES WATER SEWER STORM DRAINAGE EARTHWORK BASE COURSE & PAVING CURB & GUTTER, DRIVEWAYS, SIDEWALKS, AND MISCELLANEOUS CONCRETE ITEMS 1.8 ITEMS MISCELLANEOUS TO ALL SECTIONS EARTHWORK 1.1 RELATED DOCUMENTS SUMMARY DEFINITIONS SUBMITTALS QUALITY ASSURANCE STANDARD ABBREVIATIONS TESTING SERVICES PROJECT CONDITIONS SERVICE INTERRUPTION COORDINATION PUBLIC CONVENIENCE TRAFFIC CONTROL EROSION AND SEDIMENTATION CONTROL AND NPDES MONITORING, CONTROLS, AND LIMITATIONS FOR PERMITTED DISCHARGES 2.1 SOIL MATERIALS MISCELLANEOUS GENERAL CLEARING AND GRUBBING UNCLASSIFIED EXCAVATION, UNDERCUTTING, BORROW, EMBANKMENT ROCK SUBGRADE COMPACTION TESTING AND CONTROL SUBGRADE PREPARATION AND COMPACTION REQUIREMENTS STRUCTURES: EXCAVATION, FILLING AND BACKFILLING RIP RAP AND RIP RAP BEDDING PLACEMENT PLACEMENT OF SOIL STABILIZATION FABRIC

2 Page ii 3.10 SUBSURFACE DRAINAGE SYSTEMS METHOD OF VOLUME MEASUREMENT CLEANUP AND RESTORATION OF SITE SEEDING, SODDING AND GROUNDCOVER MISCELLANEOUS TRENCHING, BACKFILLING AND COMPACTION OF UTILITIES 1.1 GENERAL RELATED DOCUMENTS SUMMARY DEFINITIONS SUBMITTALS QUALITY ASSURANCE QUALITY STANDARDS TESTING SERVICES PROJECT CONDITIONS CROSS CONNECTION CONTROL SERVICE INTERRUPTION COORDINATION PUBLIC CONVENIENCE TRAFFIC CONTROL EROSION AND SEDIMENTATION CONTROL AND NPDES MONITORING, CONTROLS AND LIMITATIONS FOR PERMITTED DISCHARGES 2.1 SOIL, BEDDING AND BACKFILL MISCELLANEOUS PREPARATION TRENCH EXCAVATION BEDDING BACKFILLING (MATERIALS AND METHODS) COMPACTION/DENSITY SERVICE CUTS, DIRECTIONAL BORED OR PUNCHED SERVICES PAVEMENT REPAIR AND REPLACEMENT BLASTING HIGHWAY CROSSING RAILROAD CROSSING/TRACKS UNDERGROUND RIVER OR CREEK CROSSINGS SUBSURFACE WATER CROSSINGS CONCRETE COLLARS ON SEWER MAINS PLACEMENT OF RIP RAP AND RIP RAP BEDDING CLEANUP AND RESTORATION OF SITE SEEDING & GROUNDCOVER MISCELLANEOUS CURB & GUTTER, DRIVEWAYS & SIDEWALKS 1.1 RELATED DOCUMENTS SUMMARY DEFINITIONS

3 Page iii 1.4 SUBMITTALS QUALITY ASSURANCE STANDARD ABBREVIATIONS PRODUCT DELIVERY, STORAGE AND HANDLING PROJECT CONDITIONS COORDINATION MISCELLANEOUS CONSTRUCTION ALL CONCRETE ITEMS STANDARD CONCRETE CURB AND GUTTER STANDARD PORTLAND CEMENT CONCRETE SIDEWALK AND DRIVEWAY ENTRANCES 3.4 PORTLAND CEMENT CONCRETE RETAINING WALLS, HEADWALLS, STEPS, PIERS FOR STREAM CROSSINGS, FLUMES AND DITCHES, MEDIAN BARRIERS, MEDIAN STRIPS, ISLAND, ETC WATER DISTRIBUTION 1.1 RELATED DOCUMENTS SUMMARY DEFINITIONS SUBMITTALS QUALITY ASSURANCE QUALITY STANDARDS PRODUCT DELIVERY, STORAGE AND HANDLING PRODUCT SUBSTITUTIONS PRODUCT CONDITIONS CROSS-CONNECTION CONTROL SERVICE INTERRUPTION COORDINATION PIPE AND FITTINGS VALVES AND FIRE HYDRANTS MISCELLANEOUS APPURTENANCES INSTALLATION PIPE AND FITTINGS VALVES AND FIRE HYDRANTS MISCELLANEOUS APPURTENANCES TESTING AND DISINFECTION FINAL ACCEPTANCE SANITARY SEWER 1.1 RELATED DOCUMENTS SUMMARY DEFINITIONS PERFORMANCE SUBMITTALS QUALITY ASSURANCE QUALITY STANDARDS PRODUCT DELIVERY, STORAGE AND HANDLING

4 Page iv 1.9 PRODUCT SUBSTITUTIONS PROJECT CONDITIONS SERVICE INTERRUPTION COORDINATION PIPE & FITTINGS MISCELLANEOUS APPURTENANCES AND MATERIAL PIPE AND FITTINGS TUNNELING METHOD MANHOLE CONSTRUCTION ABANDONING SEWER LINE & MANHOLES CONNECTION TO EXISTING SEWERS BYPASS PUMPING SERVICE CONNECTIONS CONCRETE ENCASEMENTS TESTING PUMP STATIONS AND FORCE MAINS PIPE DESIGN LIFE CLEANUP AND RESTORATION OF SITE STORM DRAINAGE 1.1 RELATED DOCUMENTS SUMMARY DEFINITIONS SUBMITTALS QUALITY ASSURANCE QUALITY STANDARDS PRODUCT DELIVERY, STORAGE AND HANDLING PROJECT CONDITIONS SERVICE INTERRUPTION COORDINATION PIPE & FITTINGS MISCELLANEOUS APPURTENANCES PIPE INSTALLATION GENERAL MANHOLE CONSTRUCTION FOR PRECAST STANDARD MANHOLES AND DROP INLET BASES 3.3 PRECAST REINFORCED CONCRETE STORM DRAINAGE BOX STRUCTURES (Flush Wall, Waffle and Knockout Panel Type): 3.4 MASONRY STRUCTURES CONSTRUCTION OF MISCELLANEOUS APPURTENANCES ABANDONING STORM DRAINAGE LINES & MANHOLES SLOPE ANCHORS EXCAVATION OF DRAINAGE CHANNELS PLACEMENT OF RIP RAP AND RIP RAP BEDDING SUBSURFACE DRAINAGE INSPECTION MAINTENANCE

5 Page v 3.13 MEASUREMENT & PAYMENT SEGMENTAL CONCRETE RETAINING WALL SYSTEM 1.1 DESCRIPTION REFERENCE STANDARDS DESIGN REQUIREMENTS SUBMITTALS DELIVERY, STORAGE AND HANDLING DEFINITIONS SEGMENTAL CONCRETE UNITS SHALL MEET THE FOLLOWING REQUIREMENTS SOIL REINFORCEMENT UNIT DRAINAGE FILL SUBDRAIN REINFORCED BACKFILL BASE LEVELING PAD PART 3 CONSTRUCTION 3.1 GENERAL FOUNDATION SOIL PREPARATION LEVELING PAD UNIT INSTALLATION SUBDRAIN BACKFILL PLACEMENT GEOGRID INSTALLATION FIELD QUALITY CONTROL AND ASSURANCE CLEANUP AND RESTORATION OF SITE BASE COURSE AND PAVING 1.1 RELATED DOCUMENTS SUMMARY DEFINITIONS SUBMITTALS QUALITY ASSURANCE STANDARD ABBREVIATIONS PRODUCT DELIVERY, STORAGE AND HANDLING COORDINATION PART 2 - PRODUCTS 2.1 AGGREGATE BASE COURSE ASPHALT SURFACE TREATMENT ASPHALT TACK COAT BITUMINOUS CONCRETE PAVEMENTS CEMENT TREATED BASE COURSE GEOTEXTILE PAVEMENT OVERLAY SYSTEM LIME-TREATED SOIL PRIME COAT GENERAL PAVEMENT, PATCHES, REPAIR AND REPLACEMENT

6 Page vi 3.3 AGGREGATE BASE COURSE (ABC) CEMENT TREATED STABILIZATION LIME-TREATED SOIL BITUMINOUS CONCRETE PAVEMENT TACK COAT ASPHALT SURFACE TREATMENT GEOTEXTILE PAVEMENT OVERLAY SYSTEM PREPARATION OF PAVEMENT FOR RESURFACING PROTECTION OF ASPHALTIC SURFACE COURSE PAVEMENT MARKINGS SEEDING, SODDING AND GROUNDCOVER PART RELATED DOCUMENTS SUMMARY DEFINITIONS SUBMITTALS QUALITY ASSURANCE QUALITY STANDARDS STANDARD ABBREVIATIONS PRODUCT DELIVERY, STORAGE AND HANDLING PROJECT COORDINATION LOCATING SERVICES COORDINATION WARRANTY MISCELLANEOUS CONSTRUCTION OF SUBGRADE SEEDING, SODDING AND GROUNDCOVER MULCHING CLEANUP

7 Page vii BOOK 2 INTRODUCTION TO DESIGN AIDS SECTION 3 PLAN REVIEW, PERMITTING, CONSTRUCTION & ACCEPTANCE SECTION 1 INTRODUCTION SECTION 2 INSPECTION AND ACCEPTANCE FOR MAINTENANCE 2.1 EASEMENTS REQUIRED 2.2 INSPECTIONS 2.3 ITEMS APPLICABLE TO BOTH WATER AND SEWER 2.4 ITEMS APPLICABLE TO ALL UTILITY PROJECTS ILLUSTATIVE AS-BUILT DRAWING REQUIREMENTS GRAVITY SEWER 2.5 STREET INSPECTION REQUIREMENTS 2.6 ACCEPTANCE 2.7 WARRANTY MUNICIPAL STREET DESIGN SECTION 1 INTRODUCTION STREETS TOWN OF CLAYTON TOWN ENGINEER TOWN OF CLAYTON PAVEMENT POLICY ACKNOWLEDGEMENTS 2 SECTION 2 STREET/SUBDIVISION DESIGN 2.1 SUBDIVISION STREETS VERTICAL ALIGNMENT HORIZONTAL ALIGNMENT DRAINAGE STREET SECTION TYPES SIDEWALKS AND DRIVEWAYS STREET NAMES TRAFFIC IMPACT ANALYSIS 13 SECTION 3 PAVEMENT DESIGN 3.1 PAVEMENT DESIGN PAVEMENT DESIGN PROCEDURE 3.3 EXAMPLE OF PAVEMENT DESIGN METHOD EXAMPLE OF PAVEMENT DESIGN METHOD 2 SECTION 4 SUBGRADE PREPARATION AND TESTING 4.1 SUBGRADE INSPECTION CONFIRM CBR TESTS SUBGRADE INSPECTION DENSITY TESTS SUBGRADE INSPECTION PROOFROLLING 35 SECTION 5 STREET INSPECTIONS 5.1 INSPECTIONS TESTING SETUP PERIOD MAINTENANCE WARRANTY 39 SECTION 6 WARRANTY & ACCEPTANCE 6.1 GENERAL REQUIREMENTS INSPECTIONS MAINTENANCE NEW STREETS UTILITY CUTS

8 Page viii 6.6 USE OF EASEMENT HARD IMPROVEMENTS 42 SECTION 7 BIBLIOGRAPHY 43 APPENDIX A FLEXIBLE PAVEMENT DESIGN SPREADSHEETS 44 WATER & SEWER DESIGN SECTION 1 GENERAL GENERAL DESIGN STANDARDS GRAVITY COLLECTION SYSTEM DESIGN STANDARDS 10

9 Page ix STORMWATER DESIGN MANUAL SECTION 1 INTRODUCTION & GENERAL GUIDELINES INTRODUCTION AND PURPOSE DISCLAIMER COMPLIANCE TOWN ENGINEER TOWN OF CLAYTON STORMWATER MANAGEMENT PERMITS WETLANDS, WATERSHEDS, BUFFERS EROSION AND SEDIMENTATION CONTROL AND NPDES MONITORING, CONTROLS 3 AND LIMITATIONS FOR PERMITTED DISCHARGES 1.9 EASEMENTS 6 SECTION 2 HYDROLOGIC ANALYSIS 2.1 GENERAL PRINCIPALS OF STORMWATER PERFORMANCE CRITERIA HYDROLOGIC DESIGN DETERMINATION OF RUNOFF HYDROLOGIC METHODOLOGY 11 SECTION 3 PIPE GEOMETRIC DESIGN & MATERIALS 3.1 TOWN OF CLAYTON STORM DRAINAGE PIPE CRITERIA PIPE SIZE PIPE MATERIAL APPLICATIONS PIPE GRADE ENERGY LOSSES PIPE ALIGNMENT STRUCTURE PLACEMENT REQUIREMENTS PIPE TERMINAL ENDS PIPE CAMBER IN ROADWAY FILL EMBANKMENTS COVER STRUCTURES IN RELATION TO STREAM/FLOODPLAINS 26 SECTION 4 CULVERT DESIGN 4.1 INTRODUCTION PIPE CULVERT DESIGN GENERAL ROADWAY DRAINAGE SYSTEM DESIGN FREQUENCY HYDRAULIC DESIGN OF CULVERTS CURB INLET DESIGN EROSION CONTROL 30 SECTION 5 OPEN CHANNEL DESIGN 5.1 INTRODUCTION OPEN CHANNEL DESIGN 32 SECTION 6 STORMWATER MANAGEMENT DESIGN 6.1 INTRODUCTION & OBJECTIVE GENERAL PROCEDURES NEUSE BUFFER REGULATIONS WATER SUPPLY/WATERSHED PROTECTION REGULATIONS 46 SECTION 7 BEST MANAGEMENT PRACTICES (BMP S) 7.1 INTRODUCTION BMP MEASURES USED BY CITY OF WILSON OTHER FAVORABLE BMP MEASURES LOW IMPACT DEVELOPMENT (LID) DETAILS 51 SECTION 8 INSPECTION & ACCEPTANCE 8.1 LIMITS OF PUBLIC OWNERSHIP AND MAINTENANCE RESPONSIBILITY 52

10 Page x 8.2 LIMITATION OF CONSEQUENTIAL DAMAGE TO PRIVATE FACILITIES LOCATED ON 52 PUBLIC EASEMENTS 8.3 ITEMS NEEDED FOR ACCEPTANCE INSPECTIONS WARRANTY BEST MANAGEMENT PRACTICES 54 SECTION 9 FINANCIAL 9.1 NEW SUBDIVISION AND NEW CONSTRUCTION EXCLUDED PRIVATE PROPERTY OTHER THAN NEW SUBDIVISIONS 56 SECTION 10 EXAMPLE PROBLEMS CALCULATING RUNOFF RATIONAL METHOD CALCULATING RUNOFF SCS METHOD CULVERT DESIGN CURB INLET DESIGN GUTTER SPREAD OPEN CHANNEL DESIGN NUTRIENT LOADING CALCULATIONS 94 SECTION 11 REFERENCES 97

11 Page xi Appendix A Appendix B Appendix C Appendix D Appendix E Appendix F Appendix G Appendix H Appendix I ADDENDICES Stormwater Management Plan Permit Application Example Stormwater Management Statement Example Stormwater Operation and Maintenance Agreement Example Inspections and Maintenance Plans Total Nitrogen Loading Calculations Stormwater Management Annual BMP Certification Stormwater Management Checklist Stormwater BMP Supplement Forms Stormwater BMP Details FIGURES Figure 2.1 The Hydrologic cycle as illustrated by USGS. 9 Figure 2.2 Hydrologic Cycle with Increases in Impervious Surface illustrated by NEMO 9 Figure 2.3 I-D-F Curve 14 Figure 6.1 Total Nitrogen Export from Right-of-Way 42 Figure 6.2 Total Nitrogen Export from Lots 43 Figure 10.1 Nomograph for Time of Concentration 62 Figure 10.2 Determination of Runoff Volume Using SCS Curve Number 66 Figure Hydraulic Elements of Pressure Flow Through Culverts 70 Figure Culvert Design Form 74 Figure Critical Depth for Circular Pipe 75 Figure Headwater Depth for Circular Concrete Pipe Culverts w/ Inlet Control 76 Figure Head for Circular Concrete Pipe Culverts Flowing Full 77 Figure Flow in Triangular Gutter Sections 79 Figure Flow in Modified Triangular Gutter Sections 80 Figure Catch Basin Design Data Sheet 81 Figure Typical Trapezoidal Channel 86 Figure Nomograph for Solution of Manning Equation 88 Figure Solution of Manning's Equation for Trapezoidal Channels 89 Figure Channel Geometries for V-Shape, Parabolic and Trapezoidal Channels 90 Figure Maximum Allowable Velocities for Vegetated Channels 91 Figure Manning s n Related to Velocity, Hydraulic Radius and Retardance 92 Figure Retardance Classification for Vegetal Covers 93

12 Page xii TABLES Table 1.1 Minimum Monitoring Requirements 5 Table 1.2 Drainage Easement Widths for Culverts 6 Table 2.1 Design and Check Storms 11 Table 2.2 Point Precipitation Frequency Estimates From NOAA 13 Table 2.3 I-D-F Table 14 Table 2.4 Town of Clayton Runoff Coefficients for Various Surfaces 16 Table 2.5 Values of SCS Curve Number for Rural Areas 17 Table 2.6 Values of SCS Curve Number for Urban and Suburban Areas 18 Table 3.1 Allowable Materials and Conditions of Use 19 Table 3.2 Minimal Pipe Slopes 20 Table 3.3a Minimum Structure Invert Drop 21 Table 3.3b Inlet Coefficients Outlet Control, full or partly Full Entrance Head Loss 22 Table 3.3c Head Loss Coefficients 23 Table 3.4 Maximum Pipe Run Length Between Structures 23 Table 3.5 Maximum Cover Depths 26 Table 4.6 Recommended Clogging Factors in Sump Condition 30 Table 5.1 Flow Design Velocities for Newly Vegetated and Armored Channels 33 Table 5.2 Ditch Liners 34 Table 6.1 Method 1 for Residential Development when Impervious Surfaces Not Shown 42 Table 6.2 Residential/Non-residential Developments where Impervious Surfaces Shown 44 Table 6.3 Nitrogen Export Reduction Options 45 Table 6.4 Impervious Area Limits 46 Table 7.1 BMP Devices 49 Table 10.3 Entrance Loss Coefficients for Concrete Pipe Culverts 69 Table Manning Roughness Coefficient for Excavated or Dredged Channels 83 Table Manning Roughness Coefficient for Lined or Built-Up Channels 84 Table Manning Roughness Coefficient for Minor Natural Streams 84 Table Manning Roughness Coefficient for Major Natural Streams 85 Table Manning Roughness Coefficient for Flood Plains 85 Table Manning Roughness Coefficient for Improved Channels 87 Table 10.6 Nutrient Calculations for Redevelopment Sites w/ Ex. Impervious Area 94

13 Table of Contents BOOK 3 TABLE OF DETAILS Detail Number Title Common Details C01.02 Unsuitable Subgrade Trench Detail Type A (Sewer & Storm Drainage) C01.03 Pavement Surface Repair C05.01 Structure Protection Unfinished Road Grade C06.01 Standard Manhole Frame & Cover C06.02 Lockable Manhole Frame & Cover C06.03 Standard Manhole Ring and Cover Grade Adjustment C06.04 Polypropylene Plastic Step C07.01 Typical Detail for Bore Under Paved Roads / Highways (2 Sheets) C07.02 Standard Stream/Creek Crossing C07.03 Typical Residential Water & Sewer Service Schematic C09.01 Distance Between Two Holes (Openings) Formula Street Details Typical Street Cross Section (Curb and Gutter Applications) (6 Sheets) Cul-De-Sac Dimensions Residential & Commercial Typical Bikeway / Greenway Pavement Section Concrete Curb and Gutter Section (2 Sheets) Typical Valley Gutter Detail Intersection Sight Distance Diagram (Intersection of 2 City Streets) Typical Town C&G Street Connection to City or NCDOT Strip Paved Street Left Turn Prohibition Channelization at Driveways or Streets Recommended Treatment for Turn Lanes (2 Sheets) Greenway / Bikeway Driveway Crossing Detail Round About Standard Traffic Circle Detail Residential Driveway Connection Commercial Driveway Connection Typical Concrete Sidewalk and Expansion Joint Detail Typical Wheelchair Ramp Schematics Typical Wheelchair Ramp Type I (2 Sheets) Typical Wheelchair Ramp Type II (2 Sheets) Segmental Retaining Walls in Right of Ways (3 Sheets) Segmental Retaining Walls in Right of Ways (3 Sheets) Speed Hump Installation Detail (2 Sheets) Speed Table Installation Detail (2 Sheets) Speed Cushion Installation Detail Traffic Calming Median Slow Point (2 Sheets) Traffic Calming Traffic Circle Detail Traffic Calming Choker Point Raised Crosswalk Installation Detail Standard Concrete Steps for 2:1 Slopes (3 Sheets) Typical Masonry Retaining Wall (3 Sheets) Typical Granite Gravity Retaining Wall Dumpster Site Layout Water Details Water Main Pipe Laying Conditions Water Main Embedment Detail Detail of Rock Excavation Horizontal Blocking Details for Bends, Tee & Plug (2 Sheets) Thrust Collar & Blocking with Wedge Action Restrainer Gland (2 Sheets) Vertical Bend, Rodding, and Blocking Detail Combined with Tie Rod Anchors Datum Chart Town of Clayton - Manual of Specifications, Standards & Design July 2010

14 Table of Contents Thrust Footing Detail Standard Screw Valve Box Detail To 12 Std. Tapping Sleeve & Valve Assembly Variable Valve Box, and Marker Installation Detail Standard Water Tap Detail (3/4 and 1 Taps) Irrigation Tap to Existing Service Joined with Butterfly Valve (16 and Larger) (2 Sheets) Temporary 2 Blow-Off Assembly for Mains Up To Permanent 2 Blow-Off Assembly for Mains Up to Typical Fire Hydrant Streets with Side Ditch Typical Fire Hydrant Streets with Curb & Gutter Alternate Hydrant Settings Joint Restraint & R.S. Gate Valve Fire Hydrant Painting Specifications Flushing Hydrant (Above Ground, Non-Freeze) Water Main Air Release Manhole ¾ & 1 Water Meter Service Detail (2 Sheets) Standard Gang Meter Assembly Water Meter Service Detail (2 Sheets) 3 thru 8 Water Meter with Bypass Installation (2 Sheets) Fire Main Detail ¾ to 2 DCV, RPZ Assembly (Above Ground) (3 Sheets) 2-1/2 to 10 DCV, DDCV, RPZ Assembly (Above Ground (3 Sheets) Sewer Details Sanitary Sewer Pipe Laying Conditions Typical Sewer Invert Plans for Manholes High Velocity Invert Detail Standard Eccentric Precast Manhole Detail (2 Sheets) Doghouse Manhole Installation Over Existing Sewer Main (2 Sheets) Typical Shallow Precast Manhole Detail Interior Drop Into Manhole (For Drops Up 12 Dia.) Standard Manhole Venting Detail Infi-Shield External Sealing Detail Typical PVC Sewer Lateral, Cleanout with In-Line Wye (2 Sheets) Lateral Saddle Installation Detail For PVC Pipe Typical Wetwell / Valve Vault Detail (3 Sheets) Rainhood Detail Riser and Electrical Diagram (2 Sheets) Force Main Air / Pressure Release Valve in Manhole Typical Emergency Pump Connection Typical Submersible Pump Station Site Layout Typical Chain Link Fence Detail 8 FT. Height Standard Concrete Piers Detail BMP - Best Management Practice Details Typical Drainage Channels Typical Catch Basin and Curb Inlet with Hood Standard Storm Drainage Covers Typical Drop Inlet Detail Typical Junction Box Drainage Structures Notes End of Pipe Treatments Typical Headwall, Wingwall & Splash Pad Pipe Construction Into Box and Formed Invert Detail Typical Dry Detention Pond Sizing of a Bioretention Area Bioretention at Parking Perimeter No Curb Bioretention at Parking Perimeter With Curb Bioretention in Traffic Island Bioretention Area Conceptual Layout Town of Clayton - Manual of Specifications, Standards & Design July 2010

15 Table of Contents Bioretention in Off-Line Swale Delaware Sand Filter Design (2 Sheets) Infiltration Basin with Settling Chamber Typical Section of Porous Concrete Pavement Town of Clayton - Manual of Specifications, Standards & Design July 2010