130 MOSQUITO ERADICATION 



The cost was 33 cents per lineal foot. The total cost of $1,516.35 

 was divided as follows: 



Labor cost of dynamiting $ 123.75 



Cost of dynamite 1,260.10 



Cost of cleaning channel 132 . 50 



Where the old channel is not so crooked, however, it may be 

 cheaper to utilize it, straightening and regrading it where most 



Fig. 97. — A new channel for a stream. Note the straight course and clean 



edges. 



needed. Places where the stream widens out, probably will 

 give the most trouble. The best way of dealing with these is 

 to dig out a channel and use boards or a rough plastered wall, 

 where necessary, to keep it open; if boards are used, they should 

 be well filled in behind. Sharp bends where storm water may 

 scour out and erode the banks may also be advantageously 

 treated in this way. 



CLEARING STREAMS OF LOGS, ETC. 



Where the bottom of the stream is soft, so that large pockets 

 or pools have formed in the channel, such holes may be filled 



