In irrigation soil-water terminology, field capacity is the water content remaining after:
Correct answer: B. Excess gravitational water has drained
- A. All soil pores contain air
- B. Excess gravitational water has drained
- C. The soil reaches permanent wilting
- D. The crop has used all available water
Explanation
Field capacity is approximately the water content after free gravitational drainage has largely stopped. It is greater than the permanent wilting point, at which plants can no longer extract sufficient water.
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Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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