What are the Different Types of Rain Gauges?
Measuring rainfall can be is primarily done in three different ways using three different types of rain gauges. The three major types of rain gauges are the standard gauge, tipping bucket gauge and weighing gauge. Further distinguishing aspects such as how they are set up and how they deliver data can be made, though the basic operation of rain gauges does not usually vary from these primary rain gauge types. Before discussing the three common types, let’s begin with a quick overview of what a rain gauge is and its purpose.
What Is a Rain Gauge?
A rain gauge is a tool that measures how much rain falls in a certain area over a period of time. It works by collecting rainwater in a container and measuring how much water has accumulated. The measurement is usually given in millimeters.
What Is a Rain Gauge Used for?
A rain gauge is a tool that helps us measure how much rain has fallen in a certain area. People like gardeners, farmers, and scientists use it to know how much water plants need, when to water crops, and to study weather patterns. It’s really useful for understanding how much water we have and how we can use it wisely.
3 Common Types of Rain Gauges
Let’s look into the three most common types of rain gauges below.
1. The Standard Rain Gauge
The recording of rainfall using the standard or funnel rain gauge is generally done manually. These gauges work by catching the falling rain in a funnel-shaped collector that is attached to a measuring tube. The area of the collector is 10 times that of the tube; thus, the rain gauge works by magnifying the liquid by a factor of 10.
Magnifying the rain in this way allows precise measurements down to a one-hundredth of an inch. Amounts that exceed the tube capacity are caught in the outer shell of the gauge, allowing the recorder to pour out the liquid in the tube and fill it back up if needed.
2. The Tipping Bucket Rain Gauge
The operation of a tipping bucket rain gauge is quite different from the standard gauge. The receiving funnel leads to one of two small buckets. Filling of one bucket occurs at one-hundredth of an inch. The result is a “tipping” of the liquid into the outer shell of the gauge, triggering the second bucket to take its place. The process then repeats itself, allowing for precise measurement of rainfall intensity and amount. This gauge has become standard for wireless weather stations.
3. The Weighing Rain Gauge
The universal weighing rain gauge is optimal for climatology use. This is because of a vacuum that accounts for the effects of wind, allowing more rain to enter the gauge. These gauges are very precise in measuring rainfall intensity as the weighing mechanism at the bottom of the collector can be used to measure depth and time simultaneously. Recording is carried out much in the same way as the older versions of the tipping bucket gauges.
How Does a Rain Gauge Work on a Weather Station?
A rain gauge on a weather station works by collecting and measuring precipitation, typically in the form of rain. Here’s how it operates:
- Collection Funnel: The rain gauge features a funnel-like structure designed to capture raindrops as they fall.
- Measurement Cylinder: Below the funnel, there’s a narrow measuring cylinder or tube that collects the rainwater.
- Measurement Scale: The measuring cylinder has a scale marked with units of measurement, usually inches or millimeters. This scale allows you to read the amount of rain that has fallen.
- Overflow Mechanism: To prevent overflowing during heavy rainfall, some rain gauges are equipped with an overflow mechanism that diverts excess water.
- Recording Data: There are two ways for weather stations to send rainfall data: directly or wirelessly via WiFi. For example, our Rainwatch rainfall instrument can wirelessly send data to a central unit that is placed indoors.
If you are interested in purchasing a rain gauge of your own, take a look through Maximum’s selection of rainfall instruments today. Or, if you have a question for a member of our team, be sure to contact us for more information.