Non-recording rain gauges — key characteristic Non-recording (storage) rain gauges primarily do which of the following?

Introduction / Context:
Rain gauges are broadly divided into non-recording (storage) and recording types. Knowing their basic operation helps in choosing instruments for field monitoring.

Given Data / Assumptions:

• Non-recording gauges such as Symon’s gauge collect rainfall in a container.
• Readings are taken manually at set intervals to compute depth (mm).

Concept / Approach:
A non-recording gauge has a funnel and receiver. Rainfall is stored and then measured with a graduated cylinder (calibrated typically in mm of rainfall over the gauge’s catch area). No timing mechanism records intensity automatically.

Step-by-Step Solution:

Verification / Alternative check:
In contrast, recording gauges (tipping bucket, weighing, float) generate time-series data of rainfall intensity and totals without manual measurement after each event.

Why Other Options Are Wrong:

• (b) describes recording gauges.
• (c) wind speed is measured by anemometers, not rain gauges.
• (d) telemetry is possible only with recording/IoT add-ons, not inherent to non-recording gauges.
• (e) is the purpose of evaporimeters (pan A, Class-A pans), not rain gauges.

Common Pitfalls:
Assuming any cylindrical device is recording; shape does not determine functionality.

Final Answer:
Collect rainfall which is later measured manually (as depth) using a graduated measuring cylinder