Design of sewerage collection system and cost estimation

16,056 views

Published on

Published in: Education, Technology, Business
6 Comments
19 Likes
Statistics
Notes
No Downloads
Views
Total views
16,056
On SlideShare
0
From Embeds
0
Number of Embeds
6
Actions
Shares
0
Downloads
1,564
Comments
6
Likes
19
Embeds 0
No embeds

No notes for slide

Design of sewerage collection system and cost estimation

  1. 1. Submitted By:VIJAY KUMARDEPARTMENT OF CIVIL ENGINEERINGJAMIA MILLIA ISLAMIA
  2. 2. Review of design criteria of existing system ofsewerage system.Design of sewerage system.Cost estimation of sewerage system as perDelhi Schedule of Rates 2012 (DSR).
  3. 3. To transport water or waste water fromone location to another by means ofconnecting pipes through gravity.To provide a hygienic and healthyenvironment.Increases the aesthesis and propertyvalue.
  4. 4. Combined systemSanitary system Strom system
  5. 5. • Collects sanitary sewage & storm water run off in a single pipe system.• Can cause serious water pollution problems due to combined seweroverflows• Caused by large variations in flow between dry and wet weather.• This type of sewer design is no longer used in building new communities.
  6. 6. • Used for transporting sewage from houses and commercial buildings• Sanitary sewers serving industrial areas also carry Industrial sewage.• Sanitary sewage is collected with the help of sanitary sewer line• The sanitary sewer is attached to a main sewer.• The main sewer runs directly to the sewage treatment plant.
  7. 7. • A storm sewer collects storm water with the help of gutter & catch basin• Gutter allow the storm water to drain from the street directly into the stormsewer.
  8. 8. ManholeDrop ManholeFlushing TankLamp holeVent shaftInverted SiphonStorm Water Inlets /Street InletsCover and FramesCatch Basin
  9. 9. 1.Straight-Through Manhole2.Junction Manhole3.Side Entrance Manhole4.Drop Manhole5.Scraper (Service) Type Manhole6.Flushing Manhole
  10. 10. Quantity of sewage to be handledLand use patternContour Layout
  11. 11. Design periodDischargeSelf cleansing velocity (Vmin)Scouring velocity (Vmax)Roughness of pipesDepth of sewerGradientPost monsoon ground water table
  12. 12. Design Period of Civil Work (Trunk,Main Branch Sewer & Appurtenances) - 30 YearsSewage Generated - 80% of Total Water supplyFlow Assumptions - Minimum Flow Variesfrom 1/3 to ½ of average flowGround Water Infiltration -500 to 5,000 litres/km/dayManning’s Roughness Coefficient - 0.013Velocity of Flow - 0.60 m/s to 3.0 m/sRate of Flow - 80% Running Full Minimum Size of Sewer - 150 mm
  13. 13. Minimum gradient for sewers shall be designed tofulfill the requirement of self cleansing velocityPresent Peak Flow(Cumec)Recommended slope1 in0.002 1650.003 2500.005 3200.010 5000.015 7700.020 8350.030 1000
  14. 14. ContributoryPopulation RangePeak FactorUp to 20,000 3.020,000 to 50,000 2.550,000 to 7,50,000 2.25Above 7,50,000 2.0
  15. 15. MANNINGS FORMULAandQ= A x VWhereQ = DischargeS = Slope of hydraulic gradientD = Internal dia of pipe lineR = Hydraulic radius in mV = Velocity in m/sn = Mannings roughness coefficient
  16. 16. The Problem has been taken from the Manual onSewerage and sewage Treatment-1993 of Central PublicHealth and Environmental Engineering Organization(CPHEEO). Layout Plan of Manual. Ground Levels of various nodes. Total Population of the Area is two Lacs. Total Area = 101.02 ha.
  17. 17.  Average Length of sewer line between Manhole = 30 m Water supply = 150 L/C/day Total Population = 2 lacs Total Length of sewer line = 7275.12 m Population Equivalent = (200000/7275.12)= 27.49 Persons/m Rate of Infiltration = 5000 Lit/Km/Day Minimum cover to be provided overthe crown of the sewer = 1.0 m Minimum velocity in sewer at peak flow = 0.6 m/s Maximum Velocity in sewer = 2 m/s Minimum size of the sewer = 150 mm Peak factor = 3.0
  18. 18. Section From MH-69 to MH-70Diameter of Sewer Line = 150 mmMin. Velocity = 0.60 m/sSlope of the sewer Line = 1 in 160Detail Design
  19. 19.  Layout Plan of the Area Sewer Network Hydraulic Design Sewer Lines Colour Coding Plan of the Network Typical L-section of Sewer Line Typical Details of Appurtenances Typical Details of Excavation Pipe Bedding
  20. 20. Sl.No.Descriptionof ItemMaximum Minimum1 Ground Level 39.00 Mtr. 32.00 Mtr.2 Discharge 0.625 Cumec 0.0027 Cumec(2.70 Lit.)3 Slope 1 in 1100 1 in 1004 Velocity 1.83 m/s 0.61 m/s5 Dia of Pipe 1000 mm 150 mm
  21. 21. Diameter (mm) Length of Pipe (m)150 Φ 1936.01200 Φ 2015.31250 Φ 1169.21300 Φ 642.06350 Φ 180.76400 Φ 233.00500 Φ 493.86600 Φ 212.91900 Φ 305.001000 Φ 87.00Total Length 7275.12 m
  22. 22. Circular type manhole 0.91minternal diameter (atbottom) beyond 0.91m to1.67m129Circular type manhole 1.22minternal diameter (atbottom) beyond 1.68 m to2.29 m :67Circular type manhole 1.52 minternal diameter (atbottom) beyond 2.30 m :60
  23. 23.  Total Cost of Excavation(Rs.) = 25.16 Lacs Total Cost Of Manholes (Rs.) = 33.83 Lacs Total Cost of Pipes (Rs.) = 33.08 Lacs Total Cost of Foot Rest (Rs.) = 3.69 Lacs Cost of P.C.C. (1.2.4) (Rs.) = 1.69 LacsTotal cost of the Project (Rs.) = 97.46 LacsAvg. cost / Km (Rs.) = 13.40 Lacs
  24. 24. Manual on sewerage and sewage treatment(Second edition-1993)Manual on sewerage and sewage treatment (FinalDraft-2012)Delhi Schedule of Rates – 2012,Delhi analysis of Rates Vol. I & II,Environmental Engineering Vol. II, by S.K.Garg(Twenty Second Edition)Basic Environmental Engineering by JeeryA.Nathson.www.google.co.in/Images for logo ofJamia, images and photos etc.
  25. 25. THANKS

×