In the process of drainage of water through soil during rainfall, the excess water present is called :
- AGravitational waterCorrect
- BHygroscopic water
- CCapillary water
- DSaturation water
Solution
Concept
Gravitational water
Step-by-step solution
1. Water that drains out of the soil under gravity after rainfall is gravitational (free) water. 2. Hygroscopic water is held tightly on soil particles; capillary water is held by surface tension.
Explanation
Gravitational water is the excess water that moves downward through the soil pores under gravity, beyond what the soil can hold against gravity (field capacity).
Why the other options are wrong
Hygroscopic and capillary water are retained in the soil, and "saturation water" is not a classification of this kind.
Shortcut
Gravitational water drains; capillary water stays.
Common mistake
Choosing capillary water.
Correct answer: A) Gravitational water