Arrangements and certain main principles which have been adopted in Hong Kong have shown, over twenty years, that they should not be departed from so as to carry out theoretical schemes, however ingenious they may be.
Some schemes may be suitable for other places, but not be applicable here. Almost every street must contain the main artery for the discharge of rainwater, and there is always a danger of floods not only from the main hill streams led into it by catchwater drains, or otherwise, but also from the water from its tributaries extending over between it and the next street. To attempt to deviate from this plan would be fatal to the Town in case of floods, as I have frequently referred to.
In designing the water drains, I adopt the form which gives the largest water way and do not attempt to adopt the shape or form of culvert which is designed for flat gradients so as to increase the velocity by forcing the smallest amount of water into such channels as we have here.
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