CHAPTER IX 



ATTACK ON PROPAGATION AREAS BY DIIAINAGE 

 GENERAL CONSIDERATIONS 



\^7'ITH0UT doubt, proper drainage is the all- 

 ' ' important and most effective method of 

 eliminating malaria. It should be more generally 

 known that so far as mosquito eradication is con- 

 cerned, the drainage scheme should be planned with 

 a view to destroying them. The sanitarian and the 

 engineer often look at the problem from different 

 points of view. The sanitarian wishes to elimi- 

 nate all Anopheles-propagation areas permanently. 

 If that end cannot be obtained at a reasonable 

 cost, to ensure success he plans a scheme of drain- 

 age which would eliminate or reduce the possible 

 breeding areas as much as possible, keep the annual 

 maintenance expenses at the lowest figure, and 

 eliminate to the utmost conditions favorable to 

 mosquito development and the necessity for 

 continuous future inspection of ditches. Any 



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