204 ENGINEERING FOR LAND DRAINAGE. 



on the theory that a tract near natural drainage in a 

 state of nature bears a higher value by reason of this 

 fact than one which is distant and whose lack of nat- 

 ural drainage is recognized as a cause of diminished 

 value. 



In case a public drain passes through a farm for the 

 purpose of giving drainage privileges to another farm, 

 and in so doing incidentally diminishes the individual 

 expense which will be required to complete the detail 

 drainage of the first farm, it, the first farm, should be 

 assessed higher proportionally than the second, on the 

 theory that private drainage has been done on the first 

 farm at general expense. 



Classification for Assessment Purposes. 



A classification map should be prepared which shows 

 the name of the owner of each separate piece of land, 

 the location and the kind of drains proposed and the 

 estimated cost of each of the mains, and the total esti- 

 mated cost. 



With this map in hand, the party or parties to whom 

 is intrusted the classification from which the assessment 

 roll is to be prepared should make a personal exam- 

 ination of each tract or farm included in the district, 

 noting carefully the natural condition and location of 

 the land and the comparative benefit which each tract 

 will receive from the proposed work. Use the number 

 lOO to represent the classification of the tract, be it large 

 or small, which will receive the greatest benefit consid- 

 ering the principles which have been heretofore stated. 

 Compare other tracts with this and rate each on the 

 per cent system, 40-60-70, etc., placing the classifica- 



