Figure 84. Showing system of mapping drains and sizes of tiles in low places on a 

 240-acre farm. The double curved line south of the highway is a creek; the double 

 line on the north of the highway is an open ditch. The tile drains open into 

 the creek and open ditches. The rainfall is about 30 inches, and except in line of the 

 open ditch no large amount of flood water need be provided for. (See notes at bottom 

 of page 196.) 



195 



