HUMID AREAS AND THEIR RECLAMATION 63 



Upon the dike 

 at the lowest point 

 in the encircling 

 ditch a pumping 

 plant is installed, 

 with a capacity 

 sufficient to lift 

 over the dike and 

 deliver into the 

 w r ater course or 

 outside canal, in 

 twenty-four hours, 

 an amount of water 

 equal to 1^ inches 

 of water over the 

 whole area of the 

 tract. 



90. Size of the 

 unit . These 

 tracts so diked in 

 are called units, 

 and a few years 

 ago comprised 

 about 1000 acres. 

 At this time the 

 unit is consider- 

 ably larger. Fig. 

 23 shows a unit 

 containing 1760 

 acres in process of 

 reclamation. 



On February 13, 

 1915, the pumps 



