[ 44 ]
General.
179. General maintenance was continued throughout the year and all plant and structures maintained in reasonably good condition. It was found that subsidence of the sand wedge and protective pitching at Jubilee Dam had occurred during the war years. A monthly survey was made over about six months, and as no further subsidence appeared to be taking place, it was decided to carry out repair works. These were carried out under Contract No. 18 of 1947 with Messrs. Ching Hing Construction Co. and were nearly completed by the end of the year.
Considerable leakage was found to be taking place through the main upstream washout valve at Jubilee Dam. Owing to the large head of water—over 200 feet—repair work presented considerable difficulty. An attempt was made, with the assistance of salvage experts from the Royal Navy, to effect repairs, but these were not successful. As there was reason to believe that the valve had suffered damage due to the continuous jetting of water it was decided to discontinue the work until a new valve had been obtained from England.
180. Considerable leakage developed in the West half of Pipers Hill Service Reservoir and investigation showed that the concrete in the Invert had become porous. Plans were prepared for laying a new Invert of vibrated concrete and Contract No. 99/47 with the Messrs. Hong Kong Engineering and Construction Co. was accepted on the 29th of March. Work had not commenced by the end of the year.
181. Slight leakage developed through the expansion joints at Yaumati Service Reservoir. Remedial work was successfully carried out.
182. The following repairs were carried out to the distribution systems:-
2,865 repairs to outside service.
208 repairs to mains.
183. The following new mains were laid:-
Location Size of Mains Length in feet South Wall Road 4" C.I. 500 Navy Street 6" C.I. 72 Pratas Street 6" C.I. 50 Kai Tak Airport, Terminal Building 6" C.I. 208 Total: 830[ 44 ]
General.
179. General maintenance was continued throughout the year and all plant and structures maintained in reasonably good condition. It was found that subsidence of the sand wedge and protective pitching at Jubilee Dam had occurred during the war years. A monthly survey was made over about six months, and as no further subsidence appeared to be taking place, it was decided to carry out repair works. These were carried out under Contract No. 18 of 1947 with Messrs. Ching Hing Construction Co. and were nearly completed by the end of the year.
Considerable leakage was found to be taking place through the main upstream washout valve at Jubilee Dam. Owing to the large head of water-over 200 feet-repair work presented considerable difficulty. An attempt was made, with the assistance of salvage experts from the Royal Navy, to effect repairs, but these were not successful. As there was reason to believe that the valve had suffered damage due to the continuous jetting of water it was decided to discontinue the work until a new valve had been obtained from England.
180. Considerable leakage developed in the West half of Pipers Hill Service Reservoir and investigation shewed that the concrete in the Invert had become porous. Plans were prepared for laying a new Invert of vibrated concrete and Contract No. 99/47 with the Messrs. Hong Kong Engineering and Construction Co. was accepted on the 29th of March. Work had not commenced by the end of the year.
181. Slight leakage developed through the expansion joints at Yaumati Service Reservoir. Remedial work was success- fully carried out.
182. The following repairs were carried out to the distribu- tion systems:-
2,865 repairs to outside service.
208 repairs to mains.
183. The following new mains were laid:-
Location.
Size of Mains
Length in feet,
4/ C.I.
500
South Wall Road.
6" C.I.
72
Navy Street.
6" C.I.
50
Pratas Street.
6o C.I.
208
Kai Tak Airport,
Terminal Building.
Total: 830
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