206 



ENGINEERING FOR LAND DRAINAGE. 



The assessment roll and classification map here 

 given (Fig. 41) will serve to illustrate the methods 



Fig. 41,-- Classification Map of a District containing 3525 Acres. 

 (Classification figures in parenthesis.) 



described and in a measure the principles of land clas- 

 sification for district purposes. In addition to the col- 

 umns shown in the roll here given the description as to 

 section, etc., of each owner's land should immediately 

 follow the name. 



There are always many questions peculiar to each 

 case coming up in this kind of drainage work which 

 must be met and disposed of in the wisest manner pos- 

 sible. The men who have charge of the work as com- 

 missioners should be conversant with land-drainage 

 matters in general, and with the proposed work in par- 

 ticular, in order to be able to exercise good judgment 



