Discussion
Mainly due to heavy precipitation in humid region, which of the following is most required?
Answer: B
What is most required is Drainage.
In humid regions heavy rainfall regularly exceeds what the soil can absorb and what crops can use. The excess water raises the water table and saturates the root zone, so removing it by surface and subsurface drainage is the main water management need.
Waterlogging is the problem drainage solves, not something required. A sluice is a gate for controlling water flow in a channel, and evaporation is a natural loss that cannot be relied on to remove large rainfall excesses.
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