Non-Recording Rain Gauge Explained

A non-recording rain gauge measures rainfall manually. Unlike recording gauges that automatically log data over time, these require a person to read the measurement directly from the instrument, typically at specific intervals like once a day.

Rain Gauge Types Compared

Let's look at each option to identify the non-recording type:

• Tipping bucket type: This gauge automatically records rainfall. It works by collecting rain in a small bucket. When the bucket fills with a predetermined amount (e.g., 0.2 mm), it tips over, emptying the water and triggering a count. This mechanism allows for automatic logging of rainfall events, making it a recording type.
• Simon's rain gauge: This is a classic example of a non-recording rain gauge. Rainwater is collected in a calibrated glass tube or cylinder, often fitted with a funnel. The amount of rainfall is measured manually by observing the water level against the calibration marks on the tube or by using a dipstick.
• Floating type: This gauge uses a float placed inside a measuring cylinder. As rainfall accumulates, the water level rises, lifting the float. The rainfall amount is then read by noting the float's position against a marked scale. If this reading is done manually, it functions as a non-recording gauge.
• Weighing bucket type: This gauge measures rainfall based on the weight of the collected water. The bucket containing the rain rests on a spring mechanism, and a pen connected to this mechanism records the weight (and therefore, the rainfall) on a chart, usually driven by a clock. This makes it an automatic recording device.

Simon's Gauge: The Non-Recording Choice

Simon's rain gauge is classified as a non-recording type because it relies on manual observation to determine the amount of precipitation that has fallen. The other types mentioned, tipping bucket and weighing bucket, are typically automatic recording gauges.