SEWERAGE CODE OF AUSTRALIA

1 WSA 02 AGE CODE OF AUSTRALIAS ydney Water Edition Version 4 2017 SEWERAGE Code of AUSTRALIA WSA 02 sydney Water Edition Version 4 Previous edition WSA 02 1999 Previous sydney Water edition 3 July 2009 WSA 03 2002 sydney WA TER EDITION V ERSION 4 COPY RIGHT MA Y 2017 14 CONTENTS PREFACE INTRODUCTION PART 0: GLOSSARY OF TERMS AND ABBREVIATIONS I Glossar y of Terms II Abbr eviations III Referenced D ocuments IV Other R efer enc es PART 1: PLANNING AND DESIGN Contents 1 General 2 S ystem P lanning 3 Flow Estimation 4 D etail D esign 5 P roper ty C onnec tion 6 Maintenance Structures 7 Ancillar y Structur es 8 S tr uctural D esign 9 D esign Review and Dr awings Appendix A Estimation of Equivalent Population (EP) Appendix B Flow Estimation for Undeveloped Ar eas Appendix C Gauging of Sew er Over flows, Flows, Levels and Veloc ities Appendix D C omputer Flow Modelling Appendix E Analysis of Flow Gauging Results fr om E xis ting S ystems PART 2.

2 PRODUCTS AND MATERIALS Contents 10 Pr oducts and Mater ials O ver view Appendix F Quality Assur anc e of Pr oducts and Materials PART 3: CONSTRUCTION Contents 11 Gener al 12 Quality 13 Gener al C onstruction 14 Pr oducts and Mater ials WSA 02 2002-2 .2 sydney WA TER EDITION V ERSION 4 COPY RIGHT MA Y 2017 15 15 Excavation 16 Bedding for Pipes and Maintenance Structures 17 Pipe Laying and Jointing 18 Maintenance Holes ( MHs) 19 Maintenance Shafts ( MS and TMS) and Inspection S hafts ( IS) 20 Pipe Embedment and Suppor t 21 Fill 22 Acceptance Testing 23 Toler ances on As-C onstr ucted Work 24 Connections to Existing Sew ers 25 Restor ation 26 Work As C ons truc ted D etails Appendix G Ovality Testing of Gravity Sewers - Default Prover Diameters for PVC and GRP Pipes PART 4.

3 STANDARD DRAWINGS Contents 27 Intr oduction 28 Listing of Standar d Dr aw ings 29 Commentar y on SEW 1100 Series Pipeline Layout 30 Commentar y on SEW 1200 Series Embedm ent and Tr ench Fill 31 Commentar y on SEW 1300 Series Maintenance S truc tur es 32 Commentary on SEW 1400 Series Special Crossings / Structures Arr angem ents 33 Commentar y on SEW 1500 Series Insertion and Repair Systems ST ANDARD DRAWINGS SEW-1100 Series Dr aw ings Pipeline Layout SEW-1200 Series Dr aw ings Embedm ent, Tr enc h Fill and S upport S ystems SEW-1300 Series Dr aw ings Access Structures SEW-1400 Series Dr aw ings S pec ial C rossings / Structur es Ar rangements SEW 1500 Series Drawings Connections to Existing Systems sydney WATER APPENDICES SW 1 Environmental Management SW 2 Sewers in Slip and Potentially Unstable Areas SW 3 Drafting Requirements SW 4 Pipe Siz ing and Grading Tables sydney WA TER EDITION V ERSION 4 COPY RIGHT MA Y 2017 SEWERAGE Code of AUSTRALIA WSA 02 sydney Water Edition Version 4 Part

4 1: Planning and Design WSA 02 2002-2 .2 sydney WA TER EDITION V ERSION 4 COPY RIGHT MA Y 2017 38 CONTENTS 1 GENERAL SCOPE P URP OSE A ND APP LICA TIO N PLA NNING A ND DESIGN RESPONSIBILITIES AND INTERFACES General Pl anni ng responsibiliti es Desi gn res ponsibi lities Consultation with ot her parti es SEWER SYSTEM DESIGN APPROACH System desi gn li fe Obj ecti ves of the system design Desi gn out put SW Safety in desi gn 2 SYSTEM PLANNING SEWERAGE SYSTEM PHILOSOPHY AND DEFINITION Disaggregation Level 1 Total system Level 2

5 Transport ation subsystems Level 3 O perating units 1 Sewers 2 Sewage pumpi ng stations (SPSs) 3 Storage PLANNING PRINCIPLES Pl anni ng horizon Concept Plan Catc hment analysis P rovisi on for fut ure gaugi ng needs Terrorism PLANNING PARAMETERS Loadi ng per serviced property Assessm ent of future l oads Assessm ent of existing system loads E nvironmental considerati ons Geotec hnic al investi gati ons Operations and m ai ntenance considerations SEWAGE QUALITY S epticity S ewage quality / Trade waste m anagem ent PLA NNING REV IEW 3 FLOW ESTIM ATION DESIGN FLOW ESTIMA TION

6 DESIG N FLOW ES TIMA TION ME THOD General Conventional design fl ow estim ation met hod Desi gn fl ow estim ation incorporati ng existing systems Desi gn fl ow estim ation P arti ally pumped systems F low schedule SW sydney Wat er Fl ow Schedule for conventional desi gn approach SW sydney Wat er Fl ow Schedule for Leaktight sewer desi gn approach SW Sewer Lay out and Flow Diagram SW SEWERAGE Fl ow Schedule Summ ary 4 DETAIL DESIGN WSA 02 2002-2 .2 sydney WA TER EDITION V ERSION 4 COPY RIGHT MA Y 2017 39 DETAIL DESIGN PROCESS DE TA IL DES IG N CONS IDERA TIO NS Catc hment design Desi gn accuracy S ewer lay out SW Preferred gravity sewer location SW Alternati ve l ocati ons SW Indust rial areas SW Sewers i n basem ents E nvironmental considerati ons 1 G eneral 2 Urban sali nity 3 Veget ation 4 Cont ami nat ed sites 5 Coast al / Tidal zones E asem ents Disus ed s ewers S peci al design considerations HO RIZO NTAL A

7 LIG NMENT OF SEWERS General Roads, res erves and open space Railway reserves P ubl ic and pri vat e property Changes in di rection using an M H Dead-ends Horiz ontal curves i n sewers SW General SW Retic ulati on s ewers SW Branch and trunk sewers SW Sewers DN 90 0 OBSTRUCTIONS AND CLEA RA NCES General S urface obstructions Cl earance from transmission towers and power lines Cl earance from structures Underground obst ructi ons and s ervices 1 G eneral 2 Cl earanc e requirem ents PIPE SIZING AND GRA DING

8 General E nvironmental protection requi rem ents M inim um air space for ventil ation M inim um pipe sizes for mai ntenance purposes M axim um EP for reticul ation sewers Limit ation on sewer size reduction M inim um grades for s el f-cl eansing 1 G eneral 2 Reticul ation sewers 3 Property connection sewers and ends of lines M inim um grades for sli me control M axim um grades for septicity 1 Branc h and trunk sewers 2 Reticul ation sewers VE RTICAL A LIG NMEN T O F SEWERS General Long s ection desi gn plan Minimum cover over sewers WSA 02 2002-2.

9 2 sydney WA TER EDITION V ERSION 4 COPY RIGHT MA Y 2017 40 Lot servicing requi rem ents 1 G eneral 2 Serviced area requirem ents for residenti al lots 3 Serviced area requirem ents for indust rial and comm ercial l ots 4 Partial l ot servic e 5 Servicing of basem ents M inim um depth of s ewer c onnection poi nt 1 G eneral 2 Soffit requi rem ent SW 1 Surc harge areas SW service levels on private plumbing and below ground fixtures/basements SW 3 boundary trap areas 3 Physical l osses in cust omer sanitary drai ns 4 Dept h of connection point G radi ng through M Hs 1 G eneral 2 Internal fal l through MHs j oini ng sewers of sam e di am eter 3 Internal fal ls through M Hs j oini ng s ewers of di fferent di am eters 4 Large falls at M Hs 5 Effect of steep grades hy draul ic jum ps V ertic al curves Compound curves CO RROS IO N P REVE NTIO N General Internal corrosion External corrosi on STEEL SEWERS Siz es and configurations Joints F iel d wel ding F langed j oints 5

10 PROPERTY CONNECTION GE NE RAL LIM ITA TIONS OF CO NNE CTION TO SEW E RS ME THODS OF THE PROPE RTY CO NNE CTIO N General IO interfac e met hod B uri ed interfac e met hod SW Modi fied buried int erface m ethod MA XIM UM DEP TH O F PROPERTY CONNECTION NUMBER OF P ROPE RTY CO NNE CTIO NS Si ngle occ upancy lots M ulti ple occupancy l ots LOCATION OF CONNECTION POINTS Undevel oped l ots Devel oped l ots NO T USE D P ROPE RTY CO NNE CTIO N SEW E RS 6 M AINTENANCE STRUCTURES TYPES OF MAINTENANCE STRUCTURES LOCATIONS OF MAINTENANCE STRUCTURES SPACING OF MAINTE NA NCE S TRUCTURES General M ai ntenance structure spacing Reticulati on s ewers M ai ntena