113 - 
FLOOD-GATES. 
Sungei Gradut, Negri Sembilan, 
January 23rd , 1909 . 
Dear Sir, 
The following suggestion to planters in swampy dis- 
tricts with tidal rivers may he of some value. Instead of 
the usual flood-gates adopt a hanging door on hinges with 
a weight at the bottom. The rough diagram below will 
show what I mean. 
This form of gate if properly constructed will not only 
prevent water from entering drains from the river, but will 
also at low tide permit of water escaping from the drains. 
Such gates should not cost much and will require little 
or no attention, besides the risk of jamming is reduced to a 
minimum. 
Yours faithfully, 
C. A. lb Doux. 
