DRAINAGE 63 



QUESTIONS 



1. Why is water so necessary to plant life and growth? 



2. What is meant by "duty of water?" 



3. What is the purpose of land drainage? 



4. When was tile drainage introduced in the United States, and by 

 whom? 



5. How many acres may be reclaimed by drainage in the United 

 States? 



6. Explain what is meant by capillary water. Hydrostatic water, 



7. Give and explain five conditions of land needing drainage. 



8. What is the difference between an open and a retentive soil? 



9. How is artificial underdrainage secured? 



10. When are open drains advisable? 



11. Explain eight primary benefits of drainage. 



