How to Use a Rain Gauge

The rain gauge is a handy device that measures the amount of precipitation that falls. The unit of measurement is millimetres, which measure the amount of rainfall that falls on a particular area. The amount of water that falls is measured in millimetres per m2. This information is usually expressed in litres per square meter. The precipitation measurement is important as it can influence forecasting, especially during times of drought or heavy rainfall.

rain gaugeA rain gauge provides a spot sample of rain that falls over a catchment area. Since rainfall gradients are greater in hilly areas, the gauges required to provide a reliable estimate will increase. In general, a minimum density of one meter per 25 km2 is ideal. However, some factors can reduce the density of the rain gauge. For example, hilly areas may need more than one meter of rainfall to estimate rainfall accurately.

Rain gauges are not entirely reliable when temperatures are close to freezing. Ice and snow will collect in the measuring cylinders when the temperatures fall below freezing. Install an automatic electric heater near the rain gauge to prevent this problem. In addition, make sure that the area under the hood is not too cold or too hot. Ideally, a rain gauge should be placed in a room that receives direct sunlight or no wind to affect its accuracy.

The rain gauge should be used regularly. It is important to note that the water in the measuring cup will evaporate very quickly, sometimes only a few millimetres per day. To avoid evaporation, add oil to the water. As oil is lighter than water, it will float on the surface of the measurement glass. As long as the gauge is used regularly, the measurements will tell the extent of rainfall on a particular area.

The rain gauge should be placed in an open space to collect rainwater. Its location will also affect the accuracy of the measurement. Depending on where you place the rain gauge, make sure it is located in an open area. Ensure that the collecting device is placed between 50 cm and 2 m above the ground. This will make it easy to read and install. There are many benefits to using a rainfall gauge. It can determine the amount of rainfall in a given area.

The rain gauge is a handy tool to measure the amount of rainfall on a particular area. Its placement will depend on the size of the area and the type of rainfall it is measuring. It should be placed on a flat surface and in an open area. The collecting device should be placed between 50 cm and two meters above the ground. This will make it easy to read and install and give a more accurate reading than a lower-quality gauge.