Symon’s rain gauge – identify its operating type In hydrometeorological practice, a Symon’s rain gauge is classified as which type of rain gauge?

Introduction / Context:
Rain gauges are broadly divided into recording and non-recording types. The Symon’s gauge is a classic, robust instrument widely used for long-term rainfall observations in India and other countries, especially where daily manual readings are standard practice.

Given Data / Assumptions:

• Symon’s gauge comprises a collector funnel, a receiving bottle, and a calibrated measuring cylinder.
• It does not contain an automatic recording mechanism.
• Observations are typically read once or twice per day at fixed times.

Concept / Approach:
Non-recording gauges collect rainfall for subsequent manual measurement of depth. Recording gauges (tipping-bucket, weighing, or float types) produce continuous charts or digital records of rainfall versus time. Symon’s gauge specifically belongs to the non-recording category.

Step-by-Step Solution:
Identify function: Symon’s lacks moving recording components → non-recording.Select the matching option → (d) Non-recording (manual) gauge.

Verification / Alternative check:
Standard hydrology references describe Symon’s as the IMD standard non-recording gauge used for daily totals.

Why Other Options Are Wrong:

• (a), (b), and (c) are recording gauges with mechanisms that log rainfall continuously.
• (e) is invalid because the correct classification is present.

Common Pitfalls:
Assuming “standard gauge” implies “recording”; in many networks, the standard reference is a non-recording gauge used alongside a subset of recording gauges for intensity studies.

Final Answer:
Non-recording (manual) gauge