Correct Answer - Option 1 : Simple tube
Explanation:
Infiltration:
When water table is applied to the surface of the soil, a part of it seeps into the soil. This movement of water through soil is called infiltration.
This infiltration water is used in increasing the moisture of soil up to field capacity and extra water goes down and becomes groundwater.
Measurement of infiltration:
Infiltrometer is a device used to measure rate of water infiltration into the soil.
(i) Flooding type infiltrometer
- Single ring or simple tube infiltrometer
- Double ring infiltrometer
(ii) Rainfall simulator
Drawback:
(i) The major drawback of the single ring infiltrometer or simple tube infiltrometer is that the infiltrated water percolates laterally at the bottom of the ring.
(ii) Thus the tube is not truly representing the area through which infiltration is taking place.
