Table of Contents
Why rain gauge has a metallic graduated cylinder with a broad base?
Metal expands with temperature, and plastic expands even more, but glass has low temperature coefficient, so it is preferred if accuracy is sought. Graduations make it easy to read without a ruler and the broad base is to prevent tip overs.
What is the use of measuring cylinder in a rain gauge?
The Standard Rain gauge has a conical funnel emptying into a graduated cylinder. The cylinder is marked in millimeters (mm) or inches (in) and can measure up to 250 mm. The readings are recorded by measuring the height of the water collected in the cylinder.
Where should rain gauges be placed?
The gauge should be installed 2-5 feet above the ground mounted on the side of a single post. The top of the rain gauge should extend several inches above the top of the mounting post. The mounting post should have a rounded, pointed, or slanted top to avoid upward splash towards the rain gauge.
Can you use a glass as a rain gauge?
With a few basic materials, a rain gauge can also be crafted at home. You will need a straight sided glass that can be marked with a measuring scale and a coat hanger or wire bent to create a holding rack. Also, a hammer and some nails to secure the rack.
How is rain gauge being used?
The rain gauge works by capturing and collecting rain water into the funnel. The funnel empties the rain water into the cylindrical cup below. The water sitting in the cylindrical cup is accumulated rainfall total. After the storm has passed, an observer can see exactly how much rain fell.
What instrument measures cloudiness?
A ceilometer is a device that uses a laser or other light source to determine the height of a cloud ceiling or a cloud base from the ground. Ceilometers can also be used to measure the aerosol concentration within the atmosphere.
Does shape of rain gauge matter?
Research has shown that a conventionally shaped rain gauge interferes with the airflow around it and that the flow accelerates. This causes turbulence to increase over the top of the funnel and reduces the amount of precipitation caught by the rain gauge.