A proposed estimation of population, water demand,fire demand,plumbing system,sewage system and design of well & pump.

1. Environmental Engineering (Sessional)
CE-454
CUET
‘Group 6’
Group Members:
Aditi Roy-1501090
Amit Mallick-1501091
Md Zobayer Hossain Taki-1501092
Moshiur Rahman Himel-1501097
Md. Mubtasim Alam-1501100
Omar- 0801043
Course Teachers:
Prof. Dr. Mst. Fazana Rahman Zuthi
Mr. Md. Saiful Islam

3. Zones

4. Chancellor
Vice
Chancellor
Pro V.C.
Office
of V.C.
Residence
of V.C.
Residence
of Pro V.C.
Office of
Pro V.C.
Administration Academic
Hall of
residence
Dean
Faculty
 Faculty- 1
 Faculty- 2
 Faculty- 3
 Faculty-4
Institute
 Instutute-1
 Institute-2
 Institute-3
 Institute-4
 Hall-1
 Hall-2
 Hall-3
 Hall-3
 Hall-4
 Hall-5
 Office of register
 Office of controls
 Office of director
 Office of director
 Office of Exam
controls
 Central Library
 Medical Center
 Transportation
 Central
Computer center
 Office of chief
engineer
 Office of director
(Research of
Extension)

5. ESTIMATION
Present population:5665
Future population:8671
Present Water Demand:531250 lpd
Future Water Demand:2180356 lpd
Future Fire Demand:15282 gpm
Present Fire Demand:15469 gpm

7. SOIL PROPERTY
We tested soil sample of various depth (680ft -780ft)
Where our group tested (720ft-730ft)
# Optimum level is 770 to 780ft
D10=0.155 mm
FM= 1.57
Used for screen design

8. Well Design
• Slot Size: 30/1000 inch
• Water Requirement:
36cfs
• Discharge:
768561.04lpd (Based
on assumption)
Therefore, No of well: 03 nos

9. Drawdown Estimated
Needs for:
 Adequate and non depleting source
 well efficiency
 Effective well radius
 Evaluating well performance

10. Design Details
Strainer Position: 720-780 ft
Size: Dia 4in
Slot Size:30/1000 in
Gravel Pack Material: 0.92-1.4 mm
Borehole Dia: 16in

11. Pump Capacity
Head loss Considered:
 Friction
 Velocity
 Suction
 Discharge
 Minor Loss
Pump Capacity:35 HP (WHP)
Considering 70% efficiency

12. Water Treatment
Process:
 Coagulation
 Flocculation
 Disinfection
 Chlorination
 Oxidation
 Filtration

13. Water Distribution

14. Raw
Water
Plain
Sedimentation
Mixing
Basin
Flocculation
Basin
Sedimentation
Basin
Filter
Bed
Zeolite
Bed
Distribution
(Treated
Water)
HCL Aeration Coagulant Cl2
Fig: Flow Diagram of treatment Plant for water treatment

15. Plumbing System
Plumbing system means-
 Water supply and distribution pipes
 Measuring fixtures and traps, soil, waste and vent pipes
According to respective connections and devices.

17. Fig: Horizontal Layout of Plumbing
Fixtures

18. One pipe
system:

20. What is Sewer Network
A sewer network indicates-
Drainage and collection of wastewater
Consist of pipeline network
Drains streets and buildings, sewage means
and pressure lines

21. Wastewater Calculation (without infiltration)
Sewer Line Contributing Area
Water Demand
(lpd)
Peak Factor % of Wastewater Total Wastewater (lpd)
1 Zone 1 1535420 2.5 70 2686985
2 Zone 2 378000 2.5 70 661500
3 Zone 3 15288 3 70 32104.8
4 Zone 4 80587 3 70 169282.7
5 Zone 5 149661 3 70 314288.1
6 Zone 6 21400 2.5 70 37450
Total 3901610.6
Wastewater from Infiltration
Sewer Line Contributing Area Area (sq. m.) Area (ha.)
Avg. Infiltration Rate
(cubic m/day/ha.)
Infiltration (cubic
m/day)
1 Zone 1 74890.27 7.49 8.75 65.53
2 Zone 2 80125.29 8.01 8.75 70.08
3 Zone 3 5721.01 0.57 8.75 4.98
4 Zone 4 10275.28 1.02 8.75 8.93
5 Zone 5 67904.24 6.79 8.75 59.41
6 Zone 6 59836.27 5.98 8.75 52.32
Total 261.25

22. Total Waste Water = (3901610.6/1000) + 261.25 = 4162.86 m3/day
Discharge in Trunk Sewer, Q= 4162.86 m3/day
Diameter, D= 1.548 × (
𝑛𝑄
𝑆0.5)
3
8
= 1.548 × (
0.013𝑥0.048
0.00350.5 )
3
8
= 0.28 m
= 280 mm
Actual pipe diameter provided, 𝐷 𝑝𝑟𝑜𝑣𝑖𝑑𝑒𝑑 = 300 mm = 0.3 m
For 𝐷 𝑝𝑟𝑜𝑣𝑖𝑑𝑒𝑑, 𝑄 𝑓𝑢𝑙𝑙 = (
𝑆0.5
𝑛
)(
𝐷 𝑎𝑐𝑡𝑢𝑎𝑙
1.548
)
8
3
= 0.057 𝑚3
/sec
Calculation:

23. 𝑄
𝑄 𝑓𝑢𝑙𝑙
= 0.842
𝑑
𝐷 = 0.71
𝑉
𝑉 𝑓𝑢𝑙𝑙
= 1.13
𝑉𝑓𝑢𝑙𝑙 =
1
𝑛
x(
𝐷 𝑝𝑟𝑜𝑣𝑖𝑑𝑒𝑑
4
)
2
3x0.00350.5
= 0.809 m/sec
V = 0.809x0.92 m/sec
= 0.914 m/sec
As 0.6 < V < 2, So pipe diameter OK.
Hydraulic Element
Diagram:

24. Invert
Elevation

25. Thank You !