Sewerage network

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Sewerage network

  1. 1. Introduction to Sewerage Network Design Presented by Mazhar Alam
  2. 2. Basic Definitions • Sewage • Sewer • Sewerage
  3. 3. Basic Definitions Sewage It is mainly liquid waste containing some solids produced by humans and industry. Foul water , waste water. Grey water-Non faecal. From washing Black water-Contains faecal matter. It needs full treatment.
  4. 4. Basic Definitions Sewer An artificial conduit (or pipe) or system of conduits used to convey sewage from source to sewage treatment facility.
  5. 5. Basic Definitions Sewerage The system of sewers that conveys wastewater (sewage) to a treatment plant or disposal point. It includes all the chambers, manholes, gravity mains, pumps, rising mains, air valves, washouts etc
  6. 6. Design of Sewerage Network Information Required •Design Criteria •Master Plan Layout Drawing •Levels
  7. 7. Design of Sewerage Network Design Criteria It describes the parameters to be used in design; •Sewage generated per person •Minimum, maximum & proportional velocity •Minimum slopes •Peaking factors •Pipe diameters and material etc •Minimum Backdrop height.
  8. 8. Design of Sewerage Network Sewage generated per person It depends on the type of occupancy or land use details of the facility to be served. e.g. residential, commercial, recreational. Qasr Al Sarab sewage generated from villas - 275 l/p/d Hotels – 298 l/p/d
  9. 9. Design of Sewerage Network Min. , Max., Proportional velocity Min. velocity is normally 0.75m/s at full capacity to allow for self cleaning. Max. velocity is 2.5 to 3.0m/s. Proportional velocity is the actual velocity at given flow. 0.6m/s
  10. 10. Design of Sewerage Network Minimum slopes For a given diameter and roughness minimum slope is required to achieve min. velocity. Dependent on the pipe diameter and roughness e.g. for dia=200 and k=0.6 the minimum slope is 1:240. For lager dias the minimum slope is 1:1000
  11. 11. Design of Sewerage Network Peaking Factor Babbitt A/(P)^B ( A=0.176,B=5.096) Abu Dhabi (18+sqrt(P))/(4+sqrt(P)) Harman 1+(14/(4+sqrt(P))
  12. 12. Design of Sewerage Network Pipe dias & material In the UAE Minimum pipe dia is 200mm for main line and 150mm for house connection pipe. Material; uPVC – for smaller dias GRP – for larger dias
  13. 13. Design of Sewerage Network Minimum backdrop height •Avoid direct fall •Splashing •Erosion of benching •Smooth transition •Minimum value. 600mm to 700mm
  14. 14. Design of Sewerage Network Master Plan Layout Drawing •Plot – types and land use details •Road corridor – ROW for services •Location of STP or final disposal point
  15. 15. Design of Sewerage Network Levels •Spot Levels •Contours •Finished Road Levels
  16. 16. Design of Sewerage Network Steps in design • Marking the network on layout. • Calculating the population • Hydraulic design • Final presentation drawings.
  17. 17. Design of Sewerage Network Steps in design Marking the network on layout. • Gravitating the network • House connection chambers- at each plot • Manholes- maximum spacing • Angle b/w incoming & outgoing sewer. • Max. no. of connections to a manhole.
  18. 18. Design of Sewerage Network Steps in design Population calculations. • Type of plot single storey or multi rise. • Type of occupancy i.e. villa, hotel, office, school, restaurant etc. • Equivalent population.
  19. 19. Design of Sewerage Network Steps in design Hydraulic design. • Spread sheet - Excel • Software – WinDes, PipeMate, Sewer CAD.
  20. 20. Design of Sewerage Network Steps in design Final presentation drawings. To show pipe dias, invert level, cover levels, manhole types etc. • Manhole schedule • Layout drawings
  21. 21. LINE DIAGRAM- SEWAGE NETROWK
  22. 22. Phase III • Commissioned in 1993 • The Works provided an additional capacity of 25700 m3 /d • Client : • Sharjah Municipality Drainage Section (SMDS) • Civil Contractor: • Six Construct • PM /M&E RE : • Consultant : • M&E Contractor: • PCL • Halcrow • Martin Davis • Civil RE : • Stephen Smythe LINE DIAGRAM- SEWAGE NETROWK
  23. 23. 3D VIEW - WINDES
  24. 24. 3D VIEW - WINDES
  25. 25. MANHOLE SCHEDULE – WINDES OUTPUT
  26. 26. LOND SECTION - WINDES
  27. 27. Questions

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