CO129-306 - Governor Sir Blake - 1901 [8-9] — Page 215

CO129 Colonial Office Hong Kong Records 理藩院香港檔案 All AI Reviewed

ORDINANCE No. 13 of 1901.

Public Health.

15. Whenever a reduction of fall (below the standard grade 1 in 30) is necessary or permissible, it shall, wherever practicable, be made in the portion of the drain nearest to the outlet, rather than in the part nearest to the inlet, and in the main trunk of the drain rather than in the branches.

NOTE. The available fall in a house-drain, 100 feet long, is 3 feet 4 inches by one in forty. It will be better to make the first sixty feet from the inlet, with a fall of 1 in 30; and the remaining length of 40 feet with a fall of 1 in 60, than give a uniform fall throughout.

100

BIN 40

It is clear that an obstruction at i would be more easily removed than one at f, in the pipe of uniform gradient, because it would have a greater head of water behind it; and in flowing from the inlet to it, the stream will have attained a certain momentum, tending to carry it on, through the flatter part of the pipe. e.g. (2)

AB is a drain 80 feet long, with an available fall of 3 feet, between A and B. At G, distant 50 feet from A, there is a branch G D 30 feet long: D being at the same level as B.

would be 1 foot below G and D. Then a fall of one in sixty, or 1 in 60, would be to give ...

If the main drain AB were given a uniform fall of 1 in 30, then G D would have a fall of 1 in 40 only. The proper course to pursue would thus be to make the fall 1 in 30 for the first 50 feet and 1 in 60 for the remaining 30 feet.

ORDINANCE No. 13 of 1901.

Public Health.

16. Whenever the gradient of any portion of a drain is less than one in thirty, the Sanitary Board may in its discretion require an automatic flush tank or any other suitable contrivance for attaining an effective flush to be used.

17. All changes of direction in house-drains shall be made by means of properly curved pipes or by half channels in manholes and between the points at which any change of direction occurs, all house-drains shall be laid in straight lines and regular grades from point to point.

NOTE. (Inasmuch as changes of direction are the points at which obstructions most frequently occur, and for the purpose of removing obstructions generally, house holders will do well to provide, at each change of direction, a manhole, giving access to the drain. For this purpose the manhole should be made 3 feet by 1 foot in area to the surface or to a depth of five feet above the drain. Beyond this depth the manhole may be narrowed to 1 foot 6 inches by 1 foot 6 inches, But such manholes should not be found in cook-houses or in places where they may be opened and used as receptacles for the disposal of solid rubbish.)

18. No drain shall be so constructed as to pass under any building except when any other mode of construction is impracticable. Any drain passing under a building shall (unless the written permission of the Sanitary Board has first been obtained to lay it otherwise) be laid in one straight line for the whole distance beneath such building, and shall be imbedded and incased throughout its entire length in four inches of good concrete.

Whenever a drain traverses soft or yielding ground, or where water may make its appearance in the trench, the drain shall be surrounded throughout its entire length with four inches of good concrete.

The stones composing the matrix of the concrete in both cases shall be of a size to pass through a half-inch ring.

19. No drain shall be constructed in such manner as to allow any inlet to such drain to be placed inside any building.

20. The aggregate area of the openings in any grating fixed on inlets to waste-pipes from baths or sinks shall not be less than four square inches and the waste-pipe shall not have a less internal diameter than 1.5 inches.

NOTE. The object of this is to secure an efficient flush.

21. Traps or galleys for the removal of rain-water shall be provided with gratings having the nett area of the openings not less than twice the area of the trap or pipe. Such gratings shall be sunk to a depth of at least one inch below the surrounding pavement, with a slope round them equal to half the width of the grating.

NOTE. It is not sufficient to provide pipes of ample diameter; there must be openings of sufficient size to admit the rain to them.

22. Traps at the inlets to drains shall be placed so that the water-level in them is not less than one foot below the ground, and such traps shall be placed as low down as the level of the house-drain or branch will permit of; provided that the depth be not more than two feet.

23. Traps shall have not less than two inches of water seal and shall be securely fixed to the drain. All stoneware traps shall be surrounded with a thickness of four inches of lime concrete.

24. No person shall construct or fix in connection with any drain or waste-pipe the form of trap of the kind known as the Bell-trap or any trap of the kind known as the D trap, and all traps connected with any private drains shall be properly set in cement mortar to the satisfaction of the Board.

NOTE. Bell-traps and D traps from their form give rise to deposit of filth difficult to remove by flushing.

213

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ORDINANCE No. 13 of 1901. Public Health. 15. Whenever a reduction of fall (below the standard grade 1 in 30) is necessary or permissible, it shall, wherever practicable, be made in the portion of the drain nearest to the outlet, rather than in the part nearest to the inlet, and in the main trunk of the drain rather than in the branches. NOTE. The available fall in a house-drain, 100 feet long, is 3 feet 4 inches by one in forty. It will be better to make the first sixty feet from the inlet, with a fall of 1 in 30; and the remaining length of 40 feet with a fall of 1 in 60, than give a uniform fall throughout. 100 BIN 40 It is clear that an obstruction at i would be more easily removed than one at f, in the pipe of uniform gradient, because it would have a greater head of water behind it; and in flowing from the inlet to it, the stream will have attained a certain momentum, tending to carry it on, through the flatter part of the pipe. e.g. (2) AB is a drain 80 feet long, with an available fall of 3 feet, between A and B. At G, distant 50 feet from A, there is a branch G D 30 feet long: D being at the same level as B. D 06 09 would be 1 foot below G and D. Then a fall of one in sixty, or 1 in 60, would be to give ... If the main drain AB were given a uniform fall of 1 in 30, then G D would have a fall of 1 in 40 only. The proper course to pursue would thus be to make the fall 1 in 30 for the first 50 feet and 1 in 60 for the remaining 30 feet. ORDINANCE No. 13 of 1901. Public Health. 16. Whenever the gradient of any portion of a drain is less than one in thirty, the Sanitary Board may in its discretion require an automatic flush tank or any other suitable contrivance for attaining an effective flush to be used. 17. All changes of direction in house-drains shall be made by means of properly curved pipes or by half channels in manholes and between the points at which any change of direction occurs, all house-drains shall be laid in straight lines and regular grades from point to point. NOTE. (Inasmuch as changes of direction are the points at which obstructions most frequently occur, and for the purpose of removing obstructions generally, house holders will do well to provide, at each change of direction, a manhole, giving access to the drain. For this purpose the manhole should be made 3 feet by 1 foot in area to the surface or to a depth of five feet above the drain. Beyond this depth the manhole may be narrowed to 1 foot 6 inches by 1 foot 6 inches, But such manholes should not be found in cook-houses or in places where they may be opened and used as receptacles for the disposal of solid rubbish.) 18. No drain shall be so constructed as to pass under any building except when any other mode of construction is impracticable. Any drain passing under a building shall (unless the written permission of the Sanitary Board has first been obtained to lay it otherwise) be laid in one straight line for the whole distance beneath such building, and shall be imbedded and incased throughout its entire length in four inches of good concrete. Whenever a drain traverses soft or yielding ground, or where water may make its appearance in the trench, the drain shall be surrounded throughout its entire length with four inches of good concrete. The stones composing the matrix of the concrete in both cases shall be of a size to pass through a half-inch ring. 19. No drain shall be constructed in such manner as to allow any inlet to such drain to be placed inside any building. 20. The aggregate area of the openings in any grating fixed on inlets to waste-pipes from baths or sinks shall not be less than four square inches and the waste-pipe shall not have a less internal diameter than 1.5 inches. NOTE. The object of this is to secure an efficient flush. 21. Traps or galleys for the removal of rain-water shall be provided with gratings having the nett area of the openings not less than twice the area of the trap or pipe. Such gratings shall be sunk to a depth of at least one inch below the surrounding pavement, with a slope round them equal to half the width of the grating. NOTE. It is not sufficient to provide pipes of ample diameter; there must be openings of sufficient size to admit the rain to them. 22. Traps at the inlets to drains shall be placed so that the water-level in them is not less than one foot below the ground, and such traps shall be placed as low down as the level of the house-drain or branch will permit of; provided that the depth be not more than two feet. 23. Traps shall have not less than two inches of water seal and shall be securely fixed to the drain. All stoneware traps shall be surrounded with a thickness of four inches of lime concrete. 24. No person shall construct or fix in connection with any drain or waste-pipe the form of trap of the kind known as the Bell-trap or any trap of the kind known as the D trap, and all traps connected with any private drains shall be properly set in cement mortar to the satisfaction of the Board. NOTE. Bell-traps and D traps from their form give rise to deposit of filth difficult to remove by flushing. 213

Baseline (Original)

ORDINANCE No. 13 of 1901. Public Health. 15. Whenever a reduction of fall (below the standard grade 1 in 30) is necessary or permissible, it shall, wherever practicable, be made in the portion of the drain nearest to the outlet, rather than in the part nearest to the inlet, and in the main trunk of the drain rater than in the branches. Nore. The available fall in a house-drain, 100 feet lung, is 2 fet & inches by our in forty. It will be better to make the first shirty test from the inlet, with a fator! foot, uri in 30; and the remaining length of 30 feer with a fall or in 1669, than give an nuiform fall throughout. 100 BIN 40 It is clear that an obstruction at i would be more easily removed than one at 7, in the pipe of uniform gradient, because it would have a greater head of water behind it; and in flowing from the inlet to it, the stream will have attained a certain momentum, tending to carry it on, through the flatter part of the pipe. c.g. (2) AB is a drain 80) feet long, with an available fall of 3 feet, between A and B. At G, distant 50 feet from, there is a branch (7 40 feet long: ♫ being at the same level as B. D 06 ‚09 would be I fout below 2 und . Then a fall of one in flurry, or would be to give If the main-train 1B were given at uniform fall of 1 in 30, then ki have a fail of 1 in 40 only. The proper 14 in all I would thus besson til or course to pursue ou in virty-six. ORDINANCE No. 13 or 1901. Public Health. 16. Whenever the gradient of any portion of a drain is less than one in thirty, the Sanitary Board may in its discretion require an automatic flush tank or any other suitable contrivance for attaining an effective Bush to be used. 17. All changes of direction in house-drains shall be made hy means of properly curved pipes or by half channels in manholes and between the points at which any change of direction occurs, all house- drains shall be laid in straight lines and regular grades from point to point. NOTE (Inasmuch as changes of direction are the points at which obstractions most frequently ocear, and for the purpose of removing obstructions generally, house holders will do well to provide, at cách change of direction, a maulule, giving access to the drain. For this purpose the manhole should be made 3 feet by 1 foot ineber to the surkues or to a depth of fre feet above the drain. Beyond this depth the mantle may be marrowed to 1 foot 6 inches by 1 foet 6 inches, But such antale swald not be found in cook-honses or in places where they may he opened and useit as receptacles for the disposal of solid rubbish.) 18. No drain shall be so constructed as to pass under any build- ing except when any other mode of construction is impracticable. Any drain passing under a building shalt (unless the written per- mission of the Sanitary Board has first been obtained to lay it other. wise be laid in one straight line for the whole distance beneath such building, and shall be imbedded and incased throughout its entire length in four inches of good concrete, Whenever a drain traverses soft or yielding ground, or where water may make its appearance in the trench, the drain shall be surrounded throughout its entire length with four inches of good concrete, The stones composing the matrix of the concrete in both cases shall be of a size to pass through a half-inch ring, 1. No drain shall be constructed in such manner as to allow any inlet to such drain to be placed inside any building. 20. The aggregate area of the openings in any grating fixed on inlets to waste-pipes from baths or sinks shall not be less than four square inches and the waste-pipe shall not have a less internal dia. meter than 14 inches. NOTA-The object of this is to secure an efficient Aushi. 21. Traps or galleys for the removal of rain-water shall be pro- vided with gratings having the nett area of the openings not less than twice the area of the trap or pipe. Such gratings shall be sunk to a depth of at least one inch below the surrounding pavement, with a slope round them equal to half the width of the grating. NOTE-It is not safflelent to provide pipes of muple diameter; there mast he open- lugs of sufficient size to adult the rain to them. 22. Traps at the inlets to drains shall be placed so that the water- level in them is not less than one foot below the ground, and such traps shall be placed as low down as the level of the house-drain or branch will permit of; provided that the depth be not more than two feet. 23. Traps shall have not less than two inches of water seal and shall be securely fixed to the drain. All stoneware traps shall be Surrounded with a thickness of four inches of lime concrete. 24. No person shall construct or fix in connection with any drain or waste-pipe the form of trap of the kind known as the Bell- Imp or any trap of the kind known as the D trap, and all traps rom pected with any private drains shall be properly set in cement mortar to the satisfaction of the Board. No-Hell-traps and ▷ traps from their form give rise to deposit of ADA difficult remove by flushing. 213

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ORDINANCE No. 13 of 1901.

Public Health.

Nore. The available fall in a house-drain, 100 feet lung, is 2 fet & inches by our in forty. It will be better to make the first shirty test from the inlet, with a fator! foot, uri in 30; and the remaining length of 30 feer with a fall or in 1669, than give an nuiform fall throughout.

100

BIN 40

It is clear that an obstruction at i would be more easily removed than one at 7, in the pipe of uniform gradient, because it would have a greater head of water behind it; and in flowing from the inlet to it, the stream will have attained a certain momentum, tending to carry it on, through the flatter part of the pipe. c.g. (2)

AB is a drain 80) feet long, with an available

fall of 3 feet, between A and B. At G, distant 50 feet from, there is a branch (7 40 feet long: ♫ being

at the same level as B.

‚09

would be I fout below 2 und . Then

a fall of one in flurry, or

would

be to give

If the main-train 1B were given at uniform fall of 1 in 30, then ki have a fail of 1 in 40 only. The proper

14 in all I would thus besson til or

course to pursue

ou in virty-six.

ORDINANCE No. 13 or 1901.

Public Health.

17. All changes of direction in house-drains shall be made hy means of properly curved pipes or by half channels in manholes and between the points at which any change of direction occurs, all house- drains shall be laid in straight lines and regular grades from point to point.

NOTE (Inasmuch as changes of direction are the points at which obstractions most frequently ocear, and for the purpose of removing obstructions generally, house holders will do well to provide, at cách change of direction, a maulule, giving access to the drain. For this purpose the manhole should be made 3 feet by 1 foot ineber to the surkues or to a depth of fre feet above the drain. Beyond this depth the mantle may be marrowed to 1 foot 6 inches by 1 foet 6 inches, But such antale swald not be found in cook-honses or in places where they may he opened and useit

as receptacles for the disposal of solid rubbish.)

18. No drain shall be so constructed as to pass under any build-

ing except when any other mode of construction is impracticable. Any drain passing under a building shalt (unless the written per- mission of the Sanitary Board has first been obtained to lay it other.

wise be laid in one straight line for the whole distance beneath such building, and shall be imbedded and incased throughout its entire length in four inches of good concrete,

Whenever a drain traverses soft or yielding ground, or where water

may make its appearance in the trench, the drain shall be surrounded throughout its entire length with four inches of good concrete,

The stones composing the matrix of the concrete in both cases

shall be of a size to pass through a half-inch ring,

1. No drain shall be constructed in such manner as to allow

any inlet to such drain to be placed inside any building.

meter than 14 inches.

NOTA-The object of this is to secure an efficient Aushi.

21. Traps or galleys for the removal of rain-water shall be pro-

vided with gratings having the nett area of the openings not less than twice the area of the trap or pipe. Such gratings shall be sunk to

a depth of at least one inch below the surrounding pavement, with a slope round them equal to half the width of the grating.

NOTE-It is not safflelent to provide pipes of muple diameter; there mast he open-

lugs of sufficient size to adult the rain to them.

22. Traps at the inlets to drains shall be placed so that the water-

level in them is not less than one foot below the ground, and such traps shall be placed as low down as the level of the house-drain or branch will permit of; provided that the depth be not more than two

feet.

23. Traps shall have not less than two inches of water seal and shall be securely fixed to the drain. All stoneware traps shall be Surrounded with a thickness of four inches of lime concrete.

24. No person shall construct or fix in connection with any drain or waste-pipe the form of trap of the kind known as the Bell- Imp or any trap of the kind known as the D trap, and all traps rom pected with any private drains shall be properly set in cement mortar to the satisfaction of the Board.

No-Hell-traps and ▷ traps from their form give rise to deposit of ADA difficult

CO129-306 - Governor Sir Blake - 1901 [8-9] — Page 215

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