DRAINAGE 161 



Problems 



1. A farmer owns a plat of low ground 80 rods 

 long and 50 rods wide ; how many acres in this plat ? 



2. A creek runs lengthwise through this land. The 

 level of the water in the creek is 4 feet below the level 

 of the land. Can it be drained? 



3. Will the creek answer as a channel to carry off 

 the water from the tiles? 



4. Suppose he puts the tiles crosswise of the field, 

 4 rods apart, so that they open into the creek. How 

 many rods of tiling will it take? How many feet? 

 How many 4 in. tiles? 



5. What will be the cost of these tiles according to 

 the above table? 



6. What will it cost to dig the ditches and lay the 

 tiles at 20 cents per rod ? 



7. What will be the entire cost if 4 in. tiles are 

 used ? 3 in. ? 6 in. ? 



8. What will be the cost per acre for each kind of 

 tile? 



9. Suppose open ditches costing twenty cents per 

 rod will answer. How much more will the tile system 

 cost than the open ditches ? 



10. If the farmer is able to grow only iy 2 tons of 

 marsh hay worth $4 per ton on this land before drain- 

 ing and can grow 60 bu. of corn worth $0.35 per bu. 

 after draining, what is the increase in the value of the 

 crop due to drainage ? 



11. In how many years will this increase alone pay 



