151. The next or third zone between the 300- and 200-foot contours is supplied direct from the Albany and West Point service reservoirs. The eastern portion by a 14-inch main laid from the Albany reservoir along Upper Albert Road to Arbuthnot Road where it bifurcates, a 12-inch branch supplying the Arbuthnot Road Motor and a 6-inch branch traversing Caine Road. The western portion by a 12-inch main laid from the West Point service reservoir to Bonham Road Pumping Station where after supplying the motor it is reduced to 10 inches in diameter and traverses the Bonham Road ultimately connecting with the 6-inch main in Caine Road.
152. The remaining portion of the City or lowermost zone is supplied with water discharged from the exhausts of the Hydraulic Motors, that from Garden Road and Arbuthnot Road motors serving the eastern and central portions as far as Sutherland Street and that from the Bonham Road Motor the portion west of Sutherland Street, the principal mains being laid down Garden Road, Hollywood Road, Queen's Road, the Praya and Wing Lok Street, varying in size from 12 to 6 inches in diameter.
153. The Hydraulic Motors installed in the Bonham Road and Arbuthnot Road Pumping Stations were supplied by Messrs. HATHORN DAVY & Co., of Leeds and London, and consist of two power cylinders and two differential pumps.
The principal dimensions are as follows :----
Bonham Road.
Diameter of Power Cylinders,
Diameters of Differential Pump ram, ......52'.33
516
.6'8"
Length of revolution,
Arbuthnot Road. 1'.2"
68.41′′
6'.8"
154. The Hydraulic Motor installed in the Garden Road Pumping Station was supplied by Messrs. WORTHINGTON & Co., and consists of two power cylinders and two double acting pumps :-
Diameter of Power Cylinders,
Diameter of Pump Plunger,
Length of revolution,
.181"
5"
..20
155. In all the machines the motion is horizontal. In those at Bonham Road and Arbuthnot Road each power cylinder and pump is complete in itself so that one half the machinery can be worked independently of the other half."
156. The levels of the Pumping Stations floors are respectively 162, 185, and 246 feet above Ordnance Datum.
157. Back Pressure is maintained in the exhausts so as to give a maximum pressure in the dis- tributary mains equivalent to 250 feet head of water.
158. When the Motors are required to work during the night and the consumption of water in the City is insufficient to reduce the pressure in the exhaust to the required limit the motors are allowed to exhaust into No. 2 Tank situated in the centre of the western and central districts at a level of 218 feet above Ordnance Datum; the water stored in this tank during the night is utilized for the supply of the City during the following day.
159. Intimately connected with these works are those for the supply of water to the Hill District, a description of which will be found in my last annual report (Water and Drainage Department) dated 13th January, 1892.
160. The mains throughout the City have been divided into districts commanded by valves so as to facilitate the execution of repairs without causing the shutting off of the water over extensive areas. They have also been arranged so that water can be pumped into the Peak Road and Belilios service reservoirs by any one of the three Hydraulic Motors.
161. Four hundred and twenty-three Fire Hydrants have been fixed, the general rule followed being to fix one at the junction of every street and where these are more than 300 feet apart one in between. Their position is indicated on the walls opposite by the letters F.H. in white on black ground.
162. One hundred and eight Public Fountains of the Madras pattern, as manufactured by Messrs. STONE & Co., have been erected for supplying water to the occupiers of tenements who have no water laid on within their premises.
163. The annexed tabular statement (Appendix K.) gives-
(a) The details of the works included in Mr. CHADWICK's report dated the 28th of December,
1889, and the estimated cost.
(b) The works actually executed and their cost as estimated.
(c) The further works required probably in the near future to complete the scheme and their
cost as estimated by Mr. CHADWICK.
164. From this it will be seen that out of the 25 miles of mains which it was originally antici- pated would be required 22 miles nearly have been laid. The Morrison Hill and Kennedy Town reservoirs have not yet been built, as there appears to be no necessity at present to construct them.
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