pluviometers

Pluviometer, also spelled pluviometer, is an instrument used to measure precipitation. In meteorology, it is typically used to collect and quantify the amount of rain, snow, or other forms of precipitation over a specified period. The basic principle is simple: precipitation that falls into a gauge is collected, and the resulting liquid water depth, expressed in millimeters (or inches), represents the average depth of precipitation over the catchment area. The measurement is used to derive rainfall totals and to support weather forecasting, hydrology, and climate research.

Common types include non-recording rain gauges (manual gauges of glass or plastic with a scale that must be read at regular intervals), tipping-bucket rain gauges (automatic gauges that tip a small bucket after a fixed amount of rain, counting tips to yield rainfall depth), and weighing rain gauges (which measure changes in weight as water accumulates and convert that to depth). There are also recorders like pluviographs that continuously record rainfall over time. Wind shields and siting in open areas are important to minimize splash, evaporation, and wind undercatch, especially for snow.

Data from pluviometers feed weather forecasts, flood forecasting, drought monitoring, and climate statistics. Calibration and maintenance are important for accuracy, including periodic verification against standard references, cleaning, and ensuring proper placement away from obstructions. Snow and ice measurements may require snow depth to water-equivalent conversion because snow has different density than liquid water.