underdrainage

/uhn-der-drey-nij/US // ˈʌn dərˌdreɪ nɪdʒ //

底层排水,下水道,下排水,底层排水系统

Definitions

n.名词 noun

1
- : drainage of agricultural lands and removal of excess water and of alkali by drains buried beneath the surface.

I can remember when we had whole fields for skating ponds, but that was before the days of government drains and underdrainage.
Underdrainage helps to prevent such ill-effect of continued rains in the early part of a plant's life-time.
Almost without fail will he become an earnest advocate of underdrainage.
Underdrainage should be permanent in its character, and it is essential that every piece of tile be sound and well-burned.