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Which gauge gives the permanent record of rainfall?
Recording gauge
Non-recoding gauge
Copper daily gauge
Plastic gauge
Recording gauge
A recording rain gauge is an automatic device that provides a continuous, time-indexed permanent record of rainfall intensity and duration. Unlike manual gauges, it uses a mechanism to plot the cumulative rainfall against time on a rotating drum or digital logger.
A recording rain gauge is an automatic device that provides a continuous, time-indexed permanent record of rainfall intensity and duration. Unlike manual gauges, it uses a mechanism to plot the cumulative rainfall against time on a rotating drum or digital logger.
I=╬Фt╬ФPтАЛ тАФ Intensity of rainfall as the rate of change of precipitation P over time t
The recording gauge typically utilizes a float-siphon or weighing-bucket mechanism. In a tipping-bucket type, each 'tip' of a precisely calibrated bucket triggers an electrical pulse or pen movement, which is recorded on a chart or electronic memory to show the rate of accumulation over time.
Recording gauges are essential for determining rainfall intensity over short intervals (hyetographs).
Non-recording gauges (like Symons' gauge) only provide the total depth over a 24-hour period.
Common types include Tipping Bucket, Weighing Bucket, and Float-type gauges.
Continuous data acquisition without manual monitoring.
Ability to calculate rainfall intensity distribution.
Elimination of human error in reading intervals.
High initial cost and maintenance requirements.
Risk of mechanical failure or calibration drift.
Hydrological modeling and flood forecasting.
Design of urban drainage systems.
Meteorological data collection for climatological studies.
| Feature | Recording | Non-recording |
|---|---|---|
Record Type | Cumulative over time (graphical/digital) | Total depth only |
Option B (Non-recording gauge) measures the total rainfall depth at fixed intervals (usually 24 hours) and provides no information on intensity.
Copper daily gauges are specific material types of non-recording gauges used for daily measurements.
A is correct тАФ The recording gauge automatically records the rainfall depth against time, providing a continuous, permanent temporal record.
Always remember that 'Recording' refers to temporal resolution; for peak runoff calculations in urban design (Rational Method), recording gauges are mandatory to find tcтАЛ (time of concentration).