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A snow gauge. A snow gauge is a type of instrument used by meteorologists and hydrologists to gather and measure the amount of solid precipitation (as opposed to liquid precipitation, which is measured by a rain gauge) over a set period of time. [citation needed]
A measure of 100 by 100 varas (Spanish) is almost 7000 square meters, and is known traditionally throughout Spain and Latin America as a manzana (i.e., a "city block"). As well, lumber is still measured in Costa Rica using a system based on 4 vara , or 11 feet, for both round and square wood.
Large dimensions (e.g. 3 m × 3 m) of the pillow prevent any bridging that might occur from having an effect on the measurement readings. For snow pressure measurement on roofs using a smaller snow pillow (e.g. 1 m × 1 m) is the better choice, because of the weight of the filling of the snow pillow.
The same SNOTEL site in Nevada. The large panel in the foreground is the snow pillow. Basic SNOTEL sites have a pressure sensing snow pillow, storage precipitation gauge, and air temperature sensor. However, they can accommodate 64 channels of data and will accept analog and parallel or serial digital sensors.
When it comes to measuring snow cover on the ground, typically three variables are measured: the snow cover extent (SCE) — the land area covered by snow, snow cover duration (SD) — how long a particular area is covered by snow, and the snow accumulation, often expressed as snow water equivalent (SWE), which expresses how much water the snow ...
Snow water equivalent (SWE) is the depth of water that would result if the snow mass melted completely, whether over a given region or a confined snow plot, calculated as the product of the snow height in meters times the vertically-integrated density in kilograms per cubic meter.
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In Guatemala, the linear vara is 0.8421 meters. (The length of vara varies slightly among different Latin American countries.) One cuerda of 50 x 50 varas = 1,746.84 square meters (18,802.8 sq ft) One cuerda of 40 x 40 varas = 1,117.98 square meters (12,033.8 sq ft) One cuerda of 30 x 30 varas = 628.87 square meters (6,769.1 sq ft)