falling from the sky to rain on the ground has not been evaporated, infiltrated or run off of water accumulated on the water depth, as rainfall (in millimeters), which can intuitively that the number of rainfall. Rainfall measurement instruments commonly used include rain gauge and measuring cup.
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measurement concepts grading classification The classification of rainfall, different departments have different standards. Meteorological Department: rainfall is landing in a certain period of time to the ground water depth, the unit said in millimeters. Rainfall per unit time down
rainfall intensity rainfall, said. Rainfall intensity level to be divided by rainfall. Flood Control Department: the amount of rainfall in a certain period of time landing on a point on the ground or a unit area of water depth, in mm. According to Civil Air Defense Office, Hydrological Services: often said that the light rain,
skechers women, moderate rain, heavy rain, heavy rain, are generally measured on a daily rainfall. Which rainfall of 10 mm rain about to happen the following; moderate daily rainfall of 10 ~ 24.9 mm; heavy rainfall of 25 to 49.9 mm; storm rainfall of 50 to 99.9 mm; heavy rainfall is 100 ~ 199.9 mm rainfall; large storm rainfall of 200 mm. In addition, people can also be judged from precipitation in the level of the rain: Under the rain, the rain generally legible, there is no floating phenomenon; fell to the ground,
skechers shape up shoes, not scattered on the stone or tiles; ground muddy shallow depression formed slowly; at least more than two minutes before wetting the stone, tiles; only under the eaves dripping. Down in the rain, rain, such as lines, rain is not easy to distinguish; fall hard, roof tiles scattered on the water; puddles soon form the mire; roof rustle. When it rains, the rain as pouring down,
skechers shoes, fuzzy into the film; falling roof tiles, cement or stone can be splash, pools formed quickly; roof rainwater noisy sound. Determination of the basic measurement of rainfall is the rain gauge instruments. It is a watertight external Tietong, which has bearing water traps, funnel and bottle storage, while also has storage bottle with the diameter proportional to the measuring cup. Rain, rain over the funnel into the reservoir bottle. The amount of rain, it will remove the storage bottle, pour water into the measuring cup. Read from the measuring cup on the number of ticks (mm) is precipitation. When the winter snow, we should take away the funnel and bottle storage, port and direct use of water storage cylinder bearing capacity of the snow precipitation. Precipitation measured when the water tube out into the room, to be barrel of snow has melted, pour in the amount of cup, and then read the rainfall figures. Tipping bucket rain gauge: a continuous record of rainfall accumulated over time and measuring precipitation cable telemetry equipment. Sub-sensors and recorders of two parts, during which cable connection. Used dump sensor measurements, which is open between the middle of the two partitions are completely symmetrical triangle container, the partition can rotate around the horizontal axis, so that both sides take turns water container, when the side of the container when filled with a certain amount of rain (0.1 or 0.2 mm), due to the relocation of the center of gravity flipping, empty the water, as rain continues, so will dump flip, flip dump the number of access switch into electrical signals sent to the recorder, in the Cumulative clock on the counter and read self-recording precipitation data. Siphon rain gauge: siphon rain gauge is a continuous record of precipitation and precipitation time instruments. The upper funnel filled with water and the gauge the same shape and size. When the rain water through the funnel into the graduated cylinder, the cylinder with the water level inside the float will rise and float to drive self-recording pen on paper drawn from the recorded water level rise curve. Barrel of water equivalent to 10 mm, with the siphon, the water quickly discharged, pen down to zero to re-record. Self-recording clock with time given the cumulative precipitation process. Related Concepts weather forecast to rain, snow and rainfall are known, the amount of precipitation is called precipitation, said the unit usually mm precipitation. 1 mm precipitation per unit area on the water depth is 1 mm. 1 mm of precipitation fell on the number of fields it,
skechers outlet, per mu land area is 666.7 square meters, therefore, 1 mm precipitation equivalent to 0.667 cubic meters per acre increase in the water. Per cubic meter of water is 1,000 kg, so that 1 mm of precipitation is equal to the per acre also poured about 650 kg of water. According to measured 5 mm of rain falling, can dry saturated 3 cm to 6 cm. Weather forecasts issued by the meteorological department in the light rain, moderate rain, heavy rain and other technical terms, the difference between them is: within 24 hours of rain precipitation is less than 10 mm rain, light to moderate rain of 5 mm to 16. 9 mm, moderate 10 mm ~ 24.9 mm, moderate to heavy rainfall of 17 mm to 37.9 mm, the rain of 25 mm to 49.9 mm, heavy rainfall of 38 mm to 74.9 mm. Rainfall within 24 hours as heavy rain exceeding 50 mm, more than 100 mm as heavy rain, more than 250 mm as heavy rainfall. In weather forecasting terms, the different versions have different meanings. For example, the
siphon rain gauge
For the snow, the weather is, there are strict regulations, the standards it with very different rainfall. Snow weather observer in accordance with certain standards of containers will be collected to measure the snow melted measure. Weather on the snow, there are strict norms. As rainfall, is that within a certain time, the snow fall, 24 hours and 12 hours of different standards. The weather is usually forecast the weather during the day or night,
skechers shape ups, this mainly refers to the 12 hours of rainfall, snowfall of the other basic criteria: the amount of scattered light snow refers to snow but less than 0.1 mm; snow: greater than or equal 0.1 mm, less than 0.25 mm; in the snow: more than equal to 0.25 mm,
skechers shoes online, less than 3.0 mm; snow: more than equal to 3.0 mm, less than 5.0 mm; snow: snowfall greater than equal to 5.0 mm. Snowfall is the same amount of water into the snow depth and snow thickness can be converted according to the ratio of 1:15. This calculation, 97.7 mm thick snowfall is about 1.5 meters of snow. More Atlas Atlas entry Open Category: geography, nature, weather, weather
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