Sessional_Paper_1921 — Page 83

79

(d.) The chief points about the scheme are :-

(1.) The whole of the drainage in the natural drainage area to the East and West

of the line of intercepting sewers is dealt with.

(2.) It intercepts all drainage at present entering the Harbour of Refuge by

existing sewers.

(3.) The total discharging capacity of both combined sewers running slightly less than full is 226 million gallons per day and, after allowing 14 hours per day for charging and flushing leaves a discharging capacity of 94 million gallons per day, which makes ample provision for any future develop- ment in this part of the peninsula.

(4) Instantaneous flushing at low tide would improve the condition of the existing

tide locked sewers and reduce the amount of cleansing required.

(5) Practically no reconstruction of the existing sewers or storm-water drains is

required and no difficulties should be encountered in carrying out the work. (6.) A staff of 1 Chinese foreman and 2 coolies could work the scheme with little

supervision by an European Overseer.

(7.) The cost of maintenance would be light.

(8.) The estimated cost of construction is:--

(a.) Southern section from Waterloo Road to Kowloon Point $100,000.-

(b.) Northern section from Waterloo Road to Fuk Tsun Heung $72,000.

(~.) I attach table (2) of velocities, discharges, and periods of time for discharging under various tidal heads. By plotting graphs from hourly readings over ranges from the minimum and maximum, it has been found that there is no appreciable difference in level at any time from one hour before to one hour after low tide.

(f.) This report has been hurriedly prepared this morning owing to the date of the meeting of the Water Carriage Extension Committee having been changed from the 3rd to the 1st June.

1st June, 1921.

E. NEWHOUSE,