224 



FARM DEVELOPMENT 



to receive the surface water, and as soon as one is 

 clogged up another can be dug. Where these drain- 



age wells must be 

 dug to a considerable 

 depth, they must be 

 walled with brick, 

 stone, sewer pipe, iron 

 pipe, or even with 

 tubing made of boards. 



igure 121. Open ditch with banks 1 to 1, A-A; Tri rac:p of PvnpnQivp 

 to 1, B-B; and 2 to 1, C-C. 



wells, they should be 



very carefully 

 gu a r d e d at 

 the surface 

 to avoid the 

 entrance of 

 dirt, and the 

 tile drains 

 leading into 

 them should 

 be so con- 



Figure 122. Proper form of surface ditch where earth is linn. 



structed that all 

 water coming 

 into the wells 

 may be most 

 thoroughly fil- 

 tered by first 

 passing down- 

 ward through 

 a few feet of 

 soil. It is es- 



Sen tial to knOW 



that the 



stratum into which the water is to be drained has an 

 outlet and sufficient carrying or storage capacity at all 

 times to care for the water which will be brought 



Cross - section of ditch mad * 



capstan ditch- 



