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Annexe 7.
Hon. DIRECTOR OF PUBLIC WORKS,
As requested I have gone into the question of finding the best possible line for an intercepting sewer to deal with the drainage between the 400′ and 750′ contours and can locate nothing better than that generally indicated on the plan which accompanied my minute to you dated 30th March, 1921. Such a line obviates any costly severance of property as would be involved by adopting a line of less gradient nearer the 400° contour. It is also less costly in construction per occupied area served, and possesses the added advantage of dealing with a considerably larger occupied area. With good design and the proper use of existing sewers as overflows, there can be no question of such a sewer ever coming under pressure and creating a nuisance either by flooding or sewer gas. I estimate the cost at $110,000 approximately. This amount does not include for the inverted syphon, &c., through Glenealy, which was shown on the plan accompanying my report dated 30th March, 1921, in order to meet the requirements then laid down (400' to 750′ contour). The cost of this additional syphon and short sewer, (vide paragraph 1 (c) of my report dated 30th March, 1921) which would link up the drainage from the areas South of May Road and of Magazine Gap Road, where a sewer is to be extended this year to Inland Lots 2308-2310 is $8,000 approximately. If it is decided that these areas are to be included in the scheme, then there is no necessity to carry out the work mentioned in paragraph 1 (a) of my minute dated 14th April, 1921.
2. The existing sewers are of sufficient capacity to deal with a water carriage system extended to the whole area dealt with in this report.
29th April, 1921.
E. NEWHOUSE.
Annexe 8.
Mr. NEWHOUSE,
Will you kindly supply for the information of the Water Carriage Extension Committee an estimate of the cost of construction and re-construction of sewers required to deal with all drainage in an area comprising Kowloou Point to the rear of the houses on the West side of Coronation Road as far North as the new boundary road and bounded on the East by the Railway including Ho Mun Tin, all sewage to be taken to an outfall at Kowloon Point.
4th May, 1921.
Annexe 8.
T. L. PERKINS, Director of Public Works.
Hon. DIRECTOR OF PUBLIC WORKS,
I have gone into the question of drainage of the area laid down in your minute of 4th May, 1921, and find that an efficient self cleansing gravitation scheme cannot be carried out by methods usually adopted owing to the low level of the areas to be drained in relation to tidal range, necessitating flat gradients and a large sectional area of sewer, with consequent failure to cleanse when discharging the dry weather flow.
I have also considered the possibilities of a pumping scheme to serve the area men- tioned, having an ejector station in Canton Road. Such a scheme is feasible, but possesses the following drawbacks:-
(1.) It is not in my opinion sufficiently wide in its scope of area served.
No comments yet.
Private notes are available after approval.