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Rain gauge 2

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Rain gauge 2

  1. 1. Rain gauge
  2. 2. What is a rain gauge?  A rain gauge (also known as undometer, pulviometer or an ombrometer) is a type of instrument used by meteorologists hydrologists to gather and measure the amount of liquid precipitation over a set period of time.
  3. 3. Purpose of rain gauge  the purpose of rain gauge is simple to measure how much rain has fallen in the last 24 hours.  The gauge is re-set every 24 hours for accuracy and if rain fall exceeds expectations a graph is plotted to measure how much rain should fall on average for the following few days.
  4. 4. types of rain gauges  standard rain gauge  Tipping bucket rain gauge  Optical rain gauge  Acoustic rain gauge
  5. 5. Standard rain gauge  Standard rain gauge consists of a funnel emptying into a graduated cylinder,2cm in diameter, which fits inside a larger container which is 20cm in diameter and 50cm tall  When measurements are taken the height of the water in the small graduated cylinder is measured.
  6. 6. Standard rain gauge
  7. 7. Tipping bucket rain gauge  The tipping bucket rain gauge consists of a funnel that collects and channels the precipitation into a small see-saw like container  After a pre-set amount of precipitation falls, the lever tips, dumping the collected water and sending an electrical signal  Modern tipping (rg) consists of a plastic collector balanced over a pivot. When it tips it actuates a switch, which is then electronically recorded or transmitted to a remote collector station
  8. 8. Tipping bucket rain gauge
  9. 9. Optical rain gauge  These have a row of collection funnels  In an enclosed space below each is a layer diode and a photo transistor detector ,when enough water is collected to make a single drop it drops from the bottom, falling into the laser beam path.  The sensor is set at right angles to the laser so that enough light is scattered to be detected as a sudden flash or light.  The flash from the photo detector then read and transmitted or recorded
  10. 10. optical rain gauge
  11. 11. Acoustic rain gauge  the acoustic disdrometer is also known as hydrophone, it is able to sense the sound signatures for each drop size as rain strikes.  Selected moments of the drop size distribution yield rainfall rate, rainfall accumulation and other rainfall properties.
  12. 12. Acoustic rain gauge
  13. 13. Importance of rain gauge  a rain gauge measures rain fall and other precipitation like heavy rains dew and mist.  It is important to know how much moisture and water is present in the ground.  This helps people like farmers and companies who sell food goods and other users.
  14. 14. Why rg is made up of copper  A rain gauge can be made up of many things but the use of copper is advantageous as it fabricates easily and inexpensive.  It is also resistant to corrosion.  Copper is also poisonous to moulds and slimy things that might want to grow on it.
  15. 15. facts about rain gauges  They don’t work in hurricanes. No water will get collected in the cylinder because of too strong winds.  Most rain gauges are inaccurate because of winds.  Rain gauges don’t work in certain temperature ranges because precipitation gets freeze.  Unit of rain gauge is mm(usually).
  16. 16. Any questions