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8. If these gullies are then properly cleaned out at frequent intervals by well organized scavenging gangs, a great deal of the silting of the Low Level sewers will have been stopped.
9. In tide-locked sewers it is impossible to prevent the sand from depositing during the time the outfalls are covered, and it is in consequence of this that there is so much difficulty in removing the sand, which, had it not settled, could easily be kept moving.
10. In the case of (b.) the largest capacity of any of the existing Flushing Tanks is 575 gallons, excluding the large tank in Garden Road, which is comparatively new, and forms a part of the proposed scheme of Flushing Tanks.
11. If Mr. CHADWICK's rule for ascertaining the volume of water required for flushing is taken (see para. 8 of his Report of the 13th May, 1902), all these tanks are inadequate in capacity.
12. In suggesting positions for new tanks, their capacity has been calculated on Mr. CHADWICK's rule and their positions have been fixed, as far as is possible, so that the greatest effect may be produced.
13. In the case of (c.) it is necessary that iron pipes should be substituted in place of stoneware, where the roots of trees cause trouble. In some cases the gradients of existing sewers could be greatly improved, which probably on account of being extended in short lengths at different periods, have not been laid with a uniform gradient. The following are the simplest and least costly lengths to re-lay :---
1. Des Voeux Road West between Wing Lok Street and Queen's Street. 2. Bonham Strand West between Des Voeux Road West and Bonham
Strand.
3. Queen's Road West between Mercer Street and Wellington Street.
14. The other lengths which might be improved, but which would prove more costly and probably affect the levels of existing house connections, are the following:-
1. Des Vœux Road West between Sands Street and Holland Street.
2. Des Voeux Road West between Queen's Road West outfall and Water
Street.
3. Des Vœux Road Central between Ice House Street and Jackson Road.
4. Praya East between Heard Street and Wanchai Road.
5. Wanchai Road between Praya East and near Cross Street.
6. Jardine's Bazaar between St. George Street and Soo-kun-poo Market.
These are all along the Tramway except the last.
15. There is also a length of sewer along Connaught Road Central between Morrison Street and Wing Lok Street that has sunk and requires re-laying.
16. The following inverted syphons, where possible, should be removed and the pipes carried straight through the nullah culvert. No trouble has been expe- rienced with pipes passing through large culverts, where the level of the pipe is well above the invert of the culvert, and the sectional area can be maintained by widening out the culvert at this point :
1. Inverted syphon under nullah junction of Des Voeux Road West and
Hill Street.
2.
Do.
in Caine Road, Peel Street and Shelley Street.
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