Question

Rain gauge is used for measuring of

• A. Irrigation
• B. Drainage
• C. Rainfall
• D. Runoff

Hint:

Standard reading time for rain gauges in India is 8:30 AM daily.
The unit mm of rainfall is equivalent to liters per square meter ($1$ mm = $1$ L/$m^2$).
Always place a rain gauge in an open area away from trees or buildings to avoid interference.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks to identify the specific hydrological or meteorological parameter that is measured using a rain gauge.
This is a fundamental instrument used in agrometeorology and hydrology to quantify precipitation.
Detailed Explanation:

• Definition and Purpose:
A rain gauge, also known as an udometer, pluviometer, or ombrometer, is a meteorological instrument used to measure the amount of liquid precipitation over a set period of time per unit area.
It is a essential tool for farmers to determine the amount of natural water received by their fields, which directly impacts irrigation scheduling.

• Types of Rain Gauges:
Non-recording Rain Gauges: The most common is the Symon's rain gauge. It simply collects water in a graduated cylinder which is manually read at specific intervals (usually every 24 hours).
Recording Rain Gauges: These provide a continuous record of rainfall intensity and duration. Common types include the Tipping Bucket type, the Weighing Bucket type, and the Floating type.

• Measurement Units:
Rainfall is measured in depth units, typically millimeters (mm) or inches. This depth represents the level to which water would cover a flat surface if it did not drain away or evaporate.

• Distinction from Other Options:
Irrigation: Measured using flumes, weirs, or flow meters (volume/time).
Drainage: Measured by monitoring water table levels or outflow from drainage tiles.
Runoff: Measured using gauging stations on streams or small catchment outlets using flumes.

Step 2: Final Answer:
The primary and direct function of a rain gauge is to measure the depth of rainfall occurring in a specific location.