CHAPTER # 2
EXISTING SEWERAGE SYSTEM
2.1
SCOPE OF THE CHAPTER
This chapter intends to highlighten the characteristics of existing sewerage system of University of Engineering & Technology, Lahore. It includes the description of the disposal points as well as the sewage pumping stations.
2.2
METHODOLOGYKeeping all the objectives in mind, we carried out the reconnaissance survey in the University area, to see whether the system is separate or combined or partially combined.
Firstly the master plan was obtained from the P.D office and we studied the existing available sewerage system in the University campus. We carried out the field survey to see that the construction work has been executed according to the plan provided.
We found that several pipes have been abandoned and also some pipes are chocked due to bad and poor maintenance. Also the system provided is a partially separate system, which allows carrying some arbitrary portion of storm water along with domestic sewage.
A layout plan shows all details of the existing sewerage system is attached.
2.3
SEWAGE DISPOSAL STATIONSThere are sewage disposal stations working in the University Campus:
This disposal point is situated near the Jamia Mosque. There are four sewer lines fall in the wet well i.e., HH
َ, GGَ, FFَ and IIَ. The capacity of wet well connected to this disposal is 720 ft3. The capacity of the pump is 0.028 m3/sec. This disposal point does not dispose its sewage to L.D.A sewer but this sewage is disposed to Disposal Point # 2.The sizes of the sewer lines meeting at this Disposal Point are given below in table 2.1
Table # 2.1
|
Sewer line |
Size |
|
HHَ GGَ FFَ IIَ |
150mm 150mm 150mm 150mm |
2.3.2 DISPOSAL POINT #2:
This disposal point is situated near the boundary wall of the University near the staff colony. The load of sewage coming to this point is contributed by the sewers JKَ, LLَ and MMَ.
At this disposal point there is no pump for pumping the sewage. The sewage is being disposed to the nearby passing WASA sewer under gravity. The situation and detail load-taking place is clear on the map attached along with the report. The sizes of the sewer lines are given below in table 2.2
Table # 2.2
|
Sewer line |
Size |
|
JKَ LLَ MMَ |
375mm 300mm 225mm |
2.3.3 DISPOSAL POINT # 3:
This disposal point is situated in Katchi Abadi outside the boundary wall of University. The load of sewage coming to this point is contributed by sewer AAَ (225 mm) and Katchi Abadi present there.
The collective sewage from University as well as from Katchi Abadi first comes to this disposal point and finally it is disposed off to the WASA sewer.
2.4
PUMPING STATIONSThere are two pumping stations one is situated near Jamia Mosque and other is situated in Katchi Abadi outside of the boundary wall of University.
2.4.1
The operating volume of the wet well at Jamia Mosque is 720 ft3. The sewage water from Mumtaz Hall, Zubair Hall R.T. House, New Hall, Museum, Primary school, Ali Mardan Hall, Khalid Hall, Qasim Hall etc. is collected at this pumping station. This collected sewage is then pumped to the disposal point present near the staff colony.
2.4.2 PUMPING STATION IN KATCHI ABADI
The pumping station is situated outside the University area. The sewage water from Umer Hall, C-Hall, servant quarters, workshop, Alumni house, and Mathematics department, Shops etc. is collected at this pumping station.
The sewage water of Katchi Abadi is also fall in the wet well of this pumping station. There are round about 95 houses present in the Katchi Abadi. Then the collected sewage is pumped into WASA sewer line present there.
The present system of sewage disposal especially in the colony area is not satisfactory because most of the time, the pipelines flow full and manholes overflow, thereby creating extensive trouble for colony people.
The survey was also carried out in the University area to collect the information regarding the population as well as the type of residences, and part time student activities.