A rain gauge is really just a cylinder that catches rain. If an inch collects in the cylinder, it means an inch of rain has fallen. It’s that simple. Most standard rain gauges have a wide funnel leading into the cylinder and are calibrated so that one-tenth of an inch of rain measures one inch when it collects inside.
How do I locate a rain gauge?
Ideally, they should be installed in an open area, but this should also be a place that is protected from wind coming from any possible direction. A general rule is that a gauge should be placed away from any obstruction, at least twice the height of whatever that object might be.
How does a rain gauge work?
The Standard Rain Gauge
These gauges work by catching the falling rain in a funnel-shaped collector that is attached to a measuring tube. The diameter of the collector is 10 times that of the tube; thus, the rain gauge works by magnifying the liquid by a factor of 10.
Is there any water in the rain gauge?
If it has rained less than one inch since you’ve last collected the your rain data, there will be no water in the outer cylinder of your rain gauge. Remove the measuring tube of the rain gauge by taking off the lid and reaching into outer cylinder. Check to see if there is any water in the gauge itself.
Is it a good idea to place a rain gauge under a tree?
In order to have an accurate measure of precipitation, it’s important to place the rain gauge in an open area. Placing it close to buildings, trees, and shrubs can make the rain gauge show an inaccurate amount of rainfall.
How accurate is a home rain gauge?
Accuracy. Accuracy is generally important, although gardeners may require less precision than farmers. Wireless or digital rain gauges are more accurate than analog models, which may only bear markings in 1/4-inch intervals. Although, some premium models are accurate to 1/100th of an inch.
How do you make a simple rain gauge?
Making a Rain Gauge
- Cut the top section off a clear bottle as shown. …
- Place several small rocks in the bottom (for weight), then fill the bottle with water to the 0 mark. …
- Invert the top of the bottle into to rain gauge to act as a funnel. …
- Wait for the next rain and observe and record rainfall amounts.
Can you use a bucket as a rain gauge?
Rain and drizzle are the easiest forms of precipitation to measure. Rain gauges are used to measure liquid water depth and can be as simple as an open bucket with a consistent cross section throughout. Meteorologists however, use more accurate instruments and slightly more sophisticated gauges to measure rainfall.
Why are rain gauges so small?
The inner tube’s diameter is just small enough to make the depth of rain ten times what it would be in a gauge without the tube and funnel. Thus, each inch in the tube is equivalent to 0.1 inches (a tenth of an inch) of rainfall. This makes it easier to read accurately!
Do you empty rain gauge?
To assure an accurate reading, the rain gauge should be placed in an open area away from trees, the house, and other outbuildings. Position the rain gauge twice as far away as the height of a tree or other object and be sure to empty it after every rain shower.
How long do you leave a rain gauge out?
Measure rainfall of less than an inch from the inner tube. Measured amounts from the inner tube will be between a few hundredths up to one inch. Add some warm water to the inner tube and measure to the nearest hun- dredth of an inch. Record the value.
Why is a rain gauge placed 30cm above the ground?
The rain gauge is kept on a platform above the level of the ground to prevent the splashing of rain water.
Why is a rain gauge dug into the ground?
The pit should be dug to a depth so that the rim of the gauge is level with the surrounding ground. … The purpose of the grid is to reduce wind turbulence around the gauge and rain splash into the gauge.
How far from the ground should a rain gauge be placed?
Place the gauge at least 2-5 feet off the ground on the side of a pole, with the top of the cylinder several inches above the top of the pole to prevent splash back. Make sure the top of the rain gauge is level.