70 cm to200 cm rain area name
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Rainfall (or precipitation) is measured as an absolute depth thus with a unit of length (i.e. mm, cm or inches depending on the chosen metric system) and refers to the net rainfall impacting earth surface and therefore does not account for evaporation losses say from changes in temperature and/or pressure due to altitude and terminal velocity.
Measuring rainfall as a depth has become an international standard mainly because it is very easy to convert depth to volume; in fact, the main conversion factor is 1 mm of rainfall = 1 Liter of water/m² (or 0.001 m³ of water/m²); thus, to answer your question, 200cm or rainfall (or 2000 mm) means that every squared metre of land in the inner vicinity of the rain gauge received 2 m³ of water which has either turned into runoff or recharge to the shallow groundwater system via infiltration (and a small portion will evaporate too). Remember that rainfall distribution is (highly) spatially variable thus be very careful using rainfall data for areas that are not close to the rain gauge (a few km is a good rule of thumb).
Say you would like to estimate how much water has been collected from a roof area (thus completely impervious) of 250 m² during a day which experienced 12 mm of rainfall:
12 mm of rainfall = 0.012 m³/m² as per the above relationship, then (0.012 m³/m²)*250m² = 3 m³ of water.
The same process can be used to calculate net precipitation over larger areas using a combination of radar data sets in GIS to interpret spatial distribution and applying a correct loss model for different land use types coupled with an integrated hydrological model.
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Measuring rainfall as a depth has become an international standard mainly because it is very easy to convert depth to volume; in fact, the main conversion factor is 1 mm of rainfall = 1 Liter of water/m² (or 0.001 m³ of water/m²); thus, to answer your question, 200cm or rainfall (or 2000 mm) means that every squared metre of land in the inner vicinity of the rain gauge received 2 m³ of water which has either turned into runoff or recharge to the shallow groundwater system via infiltration (and a small portion will evaporate too). Remember that rainfall distribution is (highly) spatially variable thus be very careful using rainfall data for areas that are not close to the rain gauge (a few km is a good rule of thumb).
Say you would like to estimate how much water has been collected from a roof area (thus completely impervious) of 250 m² during a day which experienced 12 mm of rainfall:
12 mm of rainfall = 0.012 m³/m² as per the above relationship, then (0.012 m³/m²)*250m² = 3 m³ of water.
The same process can be used to calculate net precipitation over larger areas using a combination of radar data sets in GIS to interpret spatial distribution and applying a correct loss model for different land use types coupled with an integrated hydrological model.
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