Question:
Observation well is used for the investigation of
Observation well is used for the investigation of
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Observation well $\rightarrow$ Water table in unconfined aquifer.
Piezometer $\rightarrow$ Piezometric head in confined aquifer.
Piezometer $\rightarrow$ Piezometric head in confined aquifer.
Updated On: Sep 4, 2026
- Soil moisture content
- Water table in confined aquifer
- Water table in unconfined aquifer
- Determination of phreatic line
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Groundwater observation wells (unconfined monitoring wells) are installed to observe the elevation and seasonal fluctuation of the phreatic surface (water table) under atmospheric pressure.
Step 2: Detailed Explanation:
In hydrogeological field investigations:
1. Unconfined (Water Table) Aquifer: The upper boundary is the free water table at atmospheric pressure. An unlined perforated observation well allows groundwater to enter freely to the exact level of the ambient water table.
2. Confined Aquifer: Monitored using sealed piezometers measuring artesian pressure head (piezometric surface).
3. Earth dams: Phreatic line is determined using Casagrande open standpipe piezometers.
Step 3: Final Answer:
Hence, an observation well is used for the investigation of Water table in unconfined aquifer, matching option (C).
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