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Rainguage instrument are put at...
on flate surface
at balcony
in compound
none of these
on flate surface
A rain gauge must be installed on a level, open ground surface to ensure the accurate and uniform collection of precipitation. The site must be free from obstructions like buildings, trees, or fences that could cause turbulence or shield the gauge, leading to erroneous readings.
A rain gauge must be installed on a level, open ground surface to ensure the accurate and uniform collection of precipitation. The site must be free from obstructions like buildings, trees, or fences that could cause turbulence or shield the gauge, leading to erroneous readings.
heffтАЛ=AVтАЛ тАФ Average rainfall depth where V is volume collected and A is orifice area
The gauge operates on the principle of precipitation collection over a standard horizontal orifice area. By placing the instrument on a flat, unobstructed surface at a standard height (typically 30 cm above ground in India), the gauge minimizes aerodynamic errors caused by wind eddies and prevents splash-in or splash-out effects that occur on non-level or reflective surfaces.
The site must be level to ensure the orifice is perfectly horizontal.
The distance from an object should be at least twice the height of the object to avoid obstruction effects.
Standard height for the rim of the gauge is usually 30 cm above ground level.
A standard rain gauge in India is the Symons' gauge or a self-recording tipping bucket type.
Minimizes wind-induced turbulence errors.
Prevents rain splash entering the funnel from ground surfaces.
Ensures representative sampling of local precipitation.
Requires significant open space in urban areas.
Risk of vandalism if not in a fenced enclosure.
Meteorological observatories.
Agricultural weather stations.
Hydrological modeling for watershed management.
The orifice area should be precisely calibrated to represent the catchment area accurately.
Option B (balcony) is incorrect because buildings create significant wind turbulence and shadows that underestimate true rainfall.
Option C (compound) is vague and may contain obstructions unless specifically cleared.
A is correct тАФ Rainguage instruments must be placed on flat, level, and unobstructed ground to prevent measurement bias caused by wind turbulence or physical interference.
Always remember the '2H rule' for rain gauges: the distance to the nearest obstacle should be at least twice its height (2H) to prevent the rain shadow effect.