!OS 



Ground Water, Wells and Farm Drainage. 



ever, to arrange in such a manner that a good windmill 

 will drain a considerable body of land, where only the 

 underflow must be dealt with and the lift is less than 20 

 feot. One method of draining by wind power is illustrated 

 in Fig. 129 where A is one of a number of closed drains 





:r:5- ->:.' <v- 



FIG. 128. Method of draining sinks. 



leading to a collecting basin, D, which is connected wiili 

 the well from which the water is discharged through th" 

 pump into the drain C. If the area is small or the capacity 

 of the pump large the water may discharge directly into 

 the well, which may be provided with a float to throw the 



FIG. 129. Method of draining sinks by wind power. (From Irrigation and 



Drainage.) 



mill out of gear when the water is getting too low for the 

 pump. The object of the well is to permit the mill to work 

 during the winter. 



3. In still other cases it may be practicable to lay the 

 sink off into lands separated by broad, open and rather 

 deep ditches, into which the water from the lands could 

 drain and where evaporation would be much more rapid 

 than from the soil. To increase the rate of evaporation of 

 water from the ditches lines of water loving trees, like the 

 willow, could be planted, but these would interfere with 



