P.W.E. Hong Kong.
56
of 315 A.O.D. and having 6 Beds, the inverts of Beds at the outlet in both cases being 6.25' below cope. The Beds have a total filtering area of 6,338 sq. yds. and are capable of supplying 2.54 million gallons of filtered water per day.
The Gauge Basin 12' x 20' (inside dimensions) is, below grouted level, constructed of 1:2:4 cement concrete and above ground level of rock faced Ashlar granite. It is provided with a 15" Inlet and an 18" Outlet and has a 6'0" Rectangular Gauge for measuring the quantity of water passed.
Water from the Gauge Basin is delivered to each tier of beds by means of 18", 15" and 12" C.I. Pipes which discharge into a Conduit 2'0" wide x 3'0" deep and covered by concrete Slabs running the whole length of the Beds. Between the Conduit and the Beds are open Prefilters, 2 No. to each bed, 4'0" wide by 3'0" deep controlled by 8" Penstocks. The water from the Conduit enters the Prefilters at the bottom and rises through a 4" layer of Pea Gravel, supported on perforated tiles and concrete bars, and then passes over a cill into the Filter Beds proper. The Invert and Walls of the Conduits and Prefilters are of 1:2:4 cement concrete and finished with a fine Punched Granite Cope.
The inverts of the Filter Beds are of 1:2:4 cement concrete laid in slabs 12' square, the joints between slabs being filled with asphalte.
The side walls are of 1:2:4 cement concrete and the division wall between beds are of 1:2:4 displacer cement concrete. All walls are finished with a fine punched granite ashlar cope.
The filtering medium consists of a layer of sand 2'6" thick, a 4" layer of pea gravel and is laid on perforated tiles supported by Vitrified bricks.
The filtered water from a bed enters an outlet well and after passing over a V-Gauge is conveyed to the Service Reservoir by C.I. Pipes.
A total area of 3,096 sq. yds. has been provided with a concrete pit and kerbs around for washing Sand.
The Service Reservoir has a capacity of 4.906 million gallons, an average depth of 24' of water, is divided into two approximately equal parts by a division wall and has an area at T.W.L. 31,060 sq. ft. The top water level is 304 A.O.D. Each half of the Reservoir is capable of being filled or drawn off separately by means of 18" Inlets at 304.75 and 18" draw offs at 279.73 A.O.D.
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P.W.E. Hong Kong.
56
of 315 A.O.D. and having 6 Beds, the inverts of Beds at the outlet in both cases being 6.25' below cope. The Beds have a total filtering area of 6,338 sq. yds. and are capable of supplying 2.54 million gallons of filtered water per day.
The Gauge Basin 12' x 20' (inside dimensions) is, below grouted level, constructed of 1:2:4 cement concrete and above ground level of rock faced Ashlar granite. It is provided with a 15 Inlet and an 18′′ Outlet and has a 6′0′′ Rectangular Gauge for measuring the quantity of water passed.
Water from the Gauge Basin is delivered to each tier of s by means of 18", 15′′ and 12" C.I. Pipes which discharge into a Conduit 2′0′′ wide x 3'0" deep and covered by concrete Slabs running the whole length of the Beds. Between the Con-
it and the Beds are open Prefilters, 2 No. to each bed, 4′0′′ wide by 3′0′′ deep controlled by 8" Penstocks. The water from the Conduit enters the Prefilters at the bottom and rises through a 4′′ layer of Pea Gravel, supported on perforated tiles and con- crete bars, and then passes over a cill into the Filter Beds proper. The Invert and Walls of the Conduits and Prefilters are of 1:2:4 cement concrete and finished with a fine Punched Granite Cope.
The inverts of the Filter Beds are of 1:2:4 cement concrete laid in slabs 12' square the joints between slabs being filled with asphalte.
The side walls are of 1:2:4 cement concrete and the division wall hotween beds are of 1:2:4 displacer cement concrete. All walls are finished with a fine punched granite ashlar cope.
he filtering medium consists of a layer a sand 2'6" thick 4" layer of pea gravel and is laid on perforated tiles supported by Vitrified bricks.
over
The filtered water from a bed enters an outlet well and after passing over a V-Gauge is conveyed to the Service Reser- vore by C.1. Pipes.
A total rea of 3,096 sq. yds. has been provided with a concrete it and kerbs around for washing Sand.
The S Reservoir has a capacity of 4.906 million gal- lous, an aver depth of 24' of water, is divided into two ap- proximately equal parts by a division wall and has an area at T.W.L. 31060 sq. ft. The top water level is 304 A.0.D. Each halt the Reservoir is capable of being filled or drawn off separately s means of 18" Inlets at 304.75 and 18" draw offs at 279.73 AG.D.
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