Question

The capacity of receiving bottle of non-recording raingauge is:

• A. 5 cm
• B. 10 cm
• C. 10 mm
• D. 15 cm

Hint:

For the standard Symon's non-recording raingauge, remember two key numbers: the collector diameter (12.7 cm or 5 inches) and the bottle capacity (10 cm of rain).

Answer 1

The Correct Option is B

Step 1: Identify the standard non-recording raingauge. The most common type of non-recording raingauge used, particularly by the Indian Meteorological Department (IMD), is the Symon's raingauge.
Step 2: Describe its components. It consists of a funnel with a circular collecting area of 127 mm (5 inches) diameter, which directs the rainwater into a glass receiving bottle. The volume of the bottle is such that it can hold the rainfall collected by the funnel.
Step 3: State the capacity. The receiving bottle is designed to hold a specific amount of rainfall before it needs to be emptied. The standard capacity of this bottle is equivalent to 10 cm (or 100 mm) of rainfall over the collection area. The rainfall is measured by pouring the collected water into a calibrated measuring cylinder.