Subsurface pipe drainage in drought-prone region is superior to surface drainage in draining off water and salt, controlling ground water-level, and increasing crop output, etc.
以明沟排水为对照，论述了内陆干旱重盐碱区暗管排水在排水排盐、控制地下水位、提高土壤脱盐效果及提高作物产量等方面的优越性。
Both the surface drainage and subsurface fault-block oil reservoirs in Subei (northern Jiangsu) oilfield are very complicated.
江苏油田地表水系发达，地下断块油藏错综复杂，属于典型的断块小油气藏发育区。
However, when irrigation application decreased by 25% the salt accumulation in root zone will not be obvious and the subsurface drainage flow will decrease by 31.4%.
现状灌溉用水量减少25%时，作物根区没有产生明显的积盐，地下排水量减少31.4%。
The subsurface pipe drainage came into being just in the metaphase of20th century. It was broadly applied in USA, Japan and Egypt for30 ~ 40years.
暗管排水在20世纪中期初步形成，近30 ~40年在美国、日本、埃及等国家得到广泛应用。
The subsurface pipe drainage came into being just in the metaphase of20th century. It was broadly applied in USA, Japan and Egypt for30 ~ 40years.
暗管排水在20世纪中期初步形成，近30 ~40年在美国、日本、埃及等国家得到广泛应用。
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