1. Submitted By:
VIJAY KUMAR
DEPARTMENT OF CIVIL ENGINEERING
JAMIA MILLIA ISLAMIA

2. Review of design criteria of existing system of
sewerage system.
Design of sewerage system.
Cost estimation of sewerage system as per
Delhi Schedule of Rates 2012 (DSR).

3. To transport water or waste water from
one location to another by means of
connecting pipes through gravity.
To provide a hygienic and healthy
environment.
Increases the aesthesis and property
value.

4. Combined system
Sanitary system
 Strom system

5. • Collects sanitary sewage & storm water run off in a single pipe system.
• Can cause serious water pollution problems due to combined sewer
overflows
• 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. • 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. • 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 storm
sewer.

8. Manhole
Drop Manhole
Flushing Tank
Lamp hole
Vent shaft
Inverted Siphon
Storm Water Inlets /Street Inlets
Cover and Frames
Catch Basin

9. 1.Straight-Through Manhole
2.Junction Manhole
3.Side Entrance Manhole
4.Drop Manhole
5.Scraper (Service) Type Manhole
6.Flushing Manhole

13. Quantity of sewage to be handled
Land use pattern
Contour Layout

14. Design period
Discharge
Self cleansing velocity (Vmin)
Scouring velocity (Vmax)
Roughness of pipes
Depth of sewer
Gradient
Post monsoon ground water table

15. Design Period of Civil Work (Trunk,
Main Branch Sewer & Appurtenances) - 30 Years
Sewage Generated - 80% of Total Water supply
Flow Assumptions - Minimum Flow Varies
from 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

16. Minimum gradient for sewers shall be designed to
fulfill the requirement of self cleansing velocity
Present Peak Flow
(Cumec)
Recommended slope
1 in
0.002 165
0.003 250
0.005 320
0.010 500
0.015 770
0.020 835
0.030 1000

17. Contributory
Population Range
Peak Factor
Up to 20,000 3.0
20,000 to 50,000 2.5
50,000 to 7,50,000 2.25
Above 7,50,000 2.0

18. MANNINGS FORMULA
and
Q= A x V
Where
Q = Discharge
S = Slope of hydraulic gradient
D = Internal dia of pipe line
R = Hydraulic radius in m
V = Velocity in m/s
n = Manning's roughness coefficient

19. The Problem has been taken from the Manual on
Sewerage and sewage Treatment-1993 of Central Public
Health 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.

20.  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 over
the 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

21. Section From MH-69 to MH-70
Diameter of Sewer Line = 150 mm
Min. Velocity = 0.60 m/s
Slope of the sewer Line = 1 in 160
Detail Design

22.  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

23. Sl.
No.
Description
of Item
Maximum Minimum
1 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 100
4 Velocity 1.83 m/s 0.61 m/s
5 Dia of Pipe 1000 mm 150 mm

24. Diameter (mm) Length of Pipe (m)
150 Φ 1936.01
200 Φ 2015.31
250 Φ 1169.21
300 Φ 642.06
350 Φ 180.76
400 Φ 233.00
500 Φ 493.86
600 Φ 212.91
900 Φ 305.00
1000 Φ 87.00
Total Length 7275.12 m

25. Circular type manhole 0.91m
internal diameter (at
bottom) beyond 0.91m to
1.67m
129
Circular type manhole 1.22m
internal diameter (at
bottom) beyond 1.68 m to
2.29 m :
67
Circular type manhole 1.52 m
internal diameter (at
bottom) beyond 2.30 m :
60

26.  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 Lacs
Total cost of the Project (Rs.) = 97.46 Lacs
Avg. cost / Km (Rs.) = 13.40 Lacs

27. Manual on sewerage and sewage treatment
(Second edition-1993)
Manual on sewerage and sewage treatment (Final
Draft-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 Jeery
A.Nathson.
www.google.co.in/Images for logo of
Jamia, images and photos etc.

28. THANKS