CHAPTER # 6

FINDINGS, CONCLUSIONS AND

RECOMMENDATIONS

 

 

1. There is only one pump available at disposal point No. 1 and disposal

point No.3 to fulfill the requirement of peak flow. But according to WASA

recommendation there should be additional pump of 50% standby capacity. So our report suggests that one more pump should be installed, so both the pumps can work alternately. Also at any pumping station it is essential to install two pumps so that they can work alternatively and thus avoiding the loss and damages from over working.

2. There is a provision of open drain at the disposal point No.1 which carries sewage from force main of pump and disposes the sewage to another "15" dia pipe available nearby but due to bad maintenance this drain is completely choked and sewage leaks out from various sections of open. drain and accumulates on the road. Actually this open drain is of great advantage, the reason being tat in the case of excessive sewage, a part of it can be disposed off quite safely without creating any nuisance for the residences. So keeping in view the great importance of' this open drain, our report suggests that this open drain should be repaired and maintained properly and should be covered with slab because it provides the media for breeding of mosquitoes.

 

 

3. At disposal Point # 2, university sewer line which disposes sewage into WASA sewer line is adequate (18") (refer to Hydraulic calculation). But the size of WASA sewer is 12" 300rnm), which is undersized so it does not meet the requirements of peak sewage flow, also WASA sewer line is not maintained properly by WASA and so it further aggravates the situation by causing a problem of back flow..

Now WASA has laid a new sewer line parallel to existing one. Our report suggests that sewage should be disposed to this new sewer line.

4. From the reconnaissance survey we found that there is an accumulation of sewage between Mumtaz hall and Zubair ha1l, and it was found that pump at disposal point # 1 is not being operated during the night and so the sewage spills out from the manholes behind Murntaz hall and causes nuisance to the residents of Murntaz and Zubair hall.

Due to the above stated reason our report suggests that the pump at disposal point # 1 should be operated during the night hours at suitable intervals to eliminate this problem.

5. The existing sewerage system was designed without taking into account the storm water allowance and so the sizes of the sewers are not sufficient to carry the storm water during rainfall, and water cannot be drained out of the University campus quickly.

So our report suggests that a separate sewerage system should be designed to carry the storm water efficiently or the existing sewerage system should

be redesigned taking into account the storm water allowance.

6. Another reason for the accumulation of water in the university area is that the level of the university is lower than the surrounding area and the water from the adjoining area enters the university and also water from G. T. Road enters into the University area therefore some remedy should be adopted so that the water cannot enter the university, and the water that has already entered should be drained out efficiently.

7. The maintenance of system should be carried out at regular intervals.

To carry out the job effectively there should be sufficient sewer men.

      1. When the WASA pumping station at Kot Khwaja Saeed stops working then there is backflow of water into the university area especially in the teacher’s colony. So our report suggests that at disposal Point # 2 there should be a check valve so that sewage cannot flow back.

9. The old WASA sewer line at disposal point # 2 is no longer maintained by WASA staff and therefore problems are frequently caused in the system. Therefore the university staff should maintain the line at regular intervals.

10. The suction and delivery pipes of the pump installed at disposal station # I and at disposal station # 3 are undersized from. hydraulic point of view, so pipes of 225 mm dia should be provided to satisfy hydraulic

conditions.

11. The load of sewage on pumping station #3 is also from katchi abadi, so our report suggest that there should be separate disposal station for katchi abadi.

 

12. During heavy rainfalls water accumulates around the manholes in the campus. So our report suggests that inlets should be provided on the corners of major streets and walkways and at the midpoints of blocks so that cross-walks are not flooded.

 

 

REFRENCES.

 

    1. Steel E.W. and Terence.J.McGhee; "WATER SUPPLY AND SEWERAGE" (5TH EDITION)

    2. Babbit, Harold.E and E. Robert Bavmann; "SEWAGE AND SEWAGE TREATMENT" (8 TH EDITION)

    3. Fair,G.M.,J.C.Geyer and D.A.OKUN; "WATER AND WASTE WATER ENGG" VOL.1 & VOL .2

    4. Bartlett, Ronald E; "PUMPING STATIONS FOR WATER AND SEWAGE"

5. " SUBMERSIBLE SEWAGE PUMPING SYSTEMS HAND BOOK" Lewis Publishers, Inc.

 


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