Note that 1 millimeter of rainwater is equivalent to 1 L of water per m². Precipitation is measured in millimeters of water, or liters fallen per unit area (m²), that is, the height of the sheet of water collected on a flat surface is measured in mm or l/m². The height of the water that fills the container is equivalent to the precipitation and is measured in millimeters. It consists of a cylindrical container, usually made of plastic, with a graduated scale. The manual rain gauge is a simple indicator of the amount of rain that has fallen. The basic design of a rain gauge consists of an upper opening (of known area) for water to enter the container, which is then directed through a funnel to a collector where it is collected and can be measured visually with a graduated ruler or by weight. The inner curve of the vessels receives most of the force of the wind. This anemometer has four cups that catch the wind and cause the anemometer to rotate.
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