490 Irrigation and Drainage 



Cost of main drains per 1,000 feet 



Digging, laying Cost 



No. of feet Size Depth Tile and filling Total per rod 



1,000 7 in 5 ft. $60.00 $37.20 $97.20 $1.60 



2,700 6 in. 5 ft. 40.00 36.60 206.82 1.26 



850 Sin. 4ft. 30.00 24.20 4607 .89 



Cost of lateral drains . 



8,280 4 in. 3.5 ft. $20.00 $20.00 $331.20 $0.66 

 7,030 3 in. 3 ft 13.20 20.00 233.40 .55 



Total $914.69 



It will be seen from this table that the cost of 

 draining 80 acres, as represented in the figure, averaged 

 $11.43 per acre where everything was counted. It 

 will be seen that the cost of mains was from two to 

 three times as much as laterals of 3 -inch tile, and 

 hence, that the larger and longer the mains must be 

 made the more expensive relatively the draining will be. 



Depth of ditch 

 f 3 feet 



5-inch J 4feet 

 5 feet 



L 6 feet 

 3 feet 



6-inch^ 4feet 



5 feet 



6 feet 

 3 feet 



7-inch^ 4feet 



5 feet 



6 feet 

 3 feet 



8-inch^ 4*"* 

 o feet 



6 feet 



Cost of mains per 100 feet 

 Cost of digging Cost of filling Total cost 



