Sessional_Paper_1928 — Page 70

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Estimate of Capacity.

The area shown as "Indirect" is the area draining into Catchwaters.

With a total storage of 501.75 million gallons and a total catchment area, direct and indirect, of 4,270 acres. I estimate the capacity of the existing Kowloon Works at 5 million gallons per day. The whole of this supply is by gravitation.

FILTERING AND DISTRIBUTION.

The following tables give in condensed form particulars of the existing Filter Beds and Service Reservoirs :-

Hong Kong.

City.

Filter Beds

Service Reservoir

Name.

Remarks.

Area in Square Yds.

Capacity in mill. galls.

[ Albany

4,944

5.187

Slow sand.

Fast gravity

Bowen Road

.72+ 4171.137

3 mill. gals.

per day.

Eastern

6,338

4.88

Slow sand.

Elliot

4,395

5.317

do.

West Point

1,980

.851

do.

Kennedy Town

.343

1750 ft. Tank

Magazine Gap Road..

Peak Reservoir

Mt. Gough

.395

.388

.395

211

Total....

17,657 Square Yds.

19.104

mill. galls.

Hill

Peak.

Dist.

Filtering Capacity.

Distribution.

With a slow sand filtering area of 17,657 sq. yds. and taking a filtering rate of 400 gallons per yard per day the existing beds when all are in operation could deal efficiently with 7 million gallons per day, but as about 10% of this area will always be out of action for cleaning the working figure must be re- duced to 6.3 million gallons per day. The filtering capacity can therefore be taken as 6.3 million gallons per day by slow sand beds and 3 million gallons per day by fast gravity beds, or a total capacity per day of 9.3 million gallons.

A large portion of the existing City Distribution system is very old and consists of 3" and 4" dia. C. I. pipes with even smaller effective diameters owing to incrustation. A fair length of 15" C.1. pipes has been laid during the last three years which has helped matters considerably, but during the Summer it is increasingly difficult to keep pressures up in the central portions of the City.

Kowloon.

Filter Beds

Service Reservoir

Name.

Area in Sq. Yds.

Capacity mill. galls.

Remarks.

Kowloon Shing Mun

8,000

Slow sand.

5 mill. galls. per day

(under Construction).

Kowloon Tong

Pipers Hill

Yaumati

Hunghom

Total

8,000 Sq. Yds.

2.183

1.547

.162

.092

3.984

mifl. galls.