This document discusses the design of a sewerage system for an area made up of 25% Nirala south site and 75% Toronto, Canada. Key aspects of the design include using pipes ranging from 150mm to 575mm in diameter, with total pipe lengths and numbers provided. Assumptions made in the design include domestic wastewater flow rates and formulas used. The document also discusses a visit made to the KUET water treatment plant and provides details about its operations and components.

1. 8/9/2022 1
Group No: 04
Roll: 1301007
1301103
1301104
1301106
1301113
Course Teachers
Prof. Dr. Quazi Hamidul Bari
Prof. Dr. S.M. Moniruzzaman
Department of Civil Engineering, KUET.

2. 
Sewerage System, networks of pipes, pumps and force mains
for the collection of wastewater, or sewage , from a
community.
There are three sewerage system types:
I. Separate system.
II. Partially Separated System.
III. Combined System.
8/9/2022 2
Introduction On Sewerage System & Design;
Introduction On Baseline data collection

3. 
In sewerage system wastewater flows under the action
of gravity.
Introduction On Sewerage System & Design;
Introduction On Baseline data collection (Cont.)
Fig: Smaller diameter pipes are laid at a shallower depth and at a flatter gradient.

4. 
Here we found a difference between sewerage system
and water supply systems where in water supply
system water flows under pressure.
For design sewage system we used two area; Nirala
south site and Toronto city (Canada) and both two
areas are then combined to design a sewerage systems.
Nirala south site covers 25% of the area and Toronto
covers 75% of the area.
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Introduction On Sewerage System & Design;
Introduction On Baseline data collection (Cont.)

5. 
5
Introduction On Sewerage System & Design;
Introduction On Baseline data collection (Cont.)
Toronto
(75% of total area)
Nirala
(25% of total area)
Fig: Distribution of two different site in sewerage system area

6. 
 Usually concrete pipes are used and
 Laid 1 to 3 m below road surface.
6
Design of Sewerage System
Waste
water
generation
About
0.15m
dia Dia about 1to 3m
& upto 8 to 9m
Treatment
plant
Fig: Typical section of sewerage pipe

7. 
Assumption in designing sewerage system
 Domestic wastewater flow: 225 L/P/day
Peak flow: 6* DWF L/P/day
 Industry wastewater flow:
Light industry : 2 L/s/ha
Medium industry : 4 L/s/ha
Heavy industry : 8 L/s/ha
Formula used in designing sewerage system
Colebrook-White equation
V=
= .3mm
v=kinematic viscosity=1.003X /s 7
Design of Sewerage System(Cont.)
10
2.51
2 2 log
3.7 2
s
f
f
k v
gDS
D D gDS
 
 
 
 
 
6
10
6
10
2
m
2
m
s
k

8. Sewer Layout
In this Sewerage system we use different dia of pipes:
150mm,225mm,300mm
8

9. Field visits
Nirala
South
Site
9

10. Design of sewerage system (Nirala & Toronto
combined area)
Nirala South Site
10

11. 
Design of sewerage system (Nirala & Toronto
combined area) (Cont.)
Here, Pipe length= 2.5 m are used
Distance from last block to treatment plant= 2 km
Final Design Data
11
Pipe dia (mm) Total length(m) No of pipe(each 2.5
m)
250 200 80
300 350 140
350 250 100
500 200 80
525 380 152
575 150 60

12. Sewer Layout
In this Sewerage system we use different dia of pipes:
150mm,225mm,300mm
12

13. 
Water treatment is any process that improves the
quality of water to make it more acceptable for a
specific end use. The end use may be drinking,
irrigation, water recreation etc.
Water treatment removes contaminants and
undesirable components or reduces there concentration
so that water becomes fit for its desired end use.
8/9/2022 uthsoroy104@gmail.com 13
Study on KUET Water Treatment Plant(WTP)

14. 
After visiting KUET WTP following important features can
be noted:
1. Daily production rate about 60 thousands gallon
2. Source of water of treatment plant are :
60% underground water
40% surface water
3. Bleaching powder is used as chemical and rate 100gm
per 20 Litters
4. KUET WTP supply water only Dormitory and office.
5. Total labor and operation cost =15 laces tk per year
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Study on KUET Water Treatment Plant(WTP)
(Cont.)

15. 
6. Motors used in WTP having HP 5.5
7. Dia of main pipe 6 inches and others 4 inches.
8. Total chamber 12 nos
9. Slow sand filtter techniques are used
10. Four labors are always active in WTP:
-Two maintenance of pumping
-Two cleaning.
11. In some cases copper sulphate is used in surface
water.
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Study on KUET Water Treatment Plant(WTP)
(Cont.)

16. 
Procurement Method
1. Direct purchasing =25000 tk. (max.)
2. Request for Quotation Method (RFQM)
Revenue budget = 3 lacs
Development budget =5 lacs
Open Tendering Method(OTM)
1. Manual
2. E-Gp (online)
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Introduction to Invitation of Tender

17. 
Size of sedimentation tank =46mX16mX3.7m (3 unit & 1
stand by)
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Design of sedimentation tank and trickling
fillter

18. 
Reconnaissance survey
Fig : A roadside
restaurant using
pump oil for frying
at neerala
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19. 
Reconnaissance survey
Preparing food in unhygienic manner from a roadside
restaurant at Fulbarigate.
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20. 
Reconnaissance survey
Preparation and serving of food in messy and unhealthy
atmosphere at Ahsania hotel in Khulna city.
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21. 
 Sample collection.
 Laboratory analysis of physical properties of food
sample.
 Primary data collection.
 Secondary data collection.
 Hospital visits and taking interview of doctors.
 Data Analysis.
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Works to be Done

22. 
Thank
You
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