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<p>Rain gauges are critical tools for measuring precipitation, yet they are prone to systematic errors due to factors such as undercatch, mechanical issues, and wind interference. To address these limitations, a "giant rain gauge" with a 100 m<sup>2</sup> collection area was constructed at Tuscia University, Italy. This study analyzed over 300 rainfall events recorded between 2012 and 2022 to evaluate discrepancies between the giant rain gauge and standard rain gauges. The findings reveal notable differences in recorded precipitation, particularly over short time intervals. For aggregation durations of 5 and 10&#xa0;min, discrepancies exceed 25% and 20%, respectively. These differences diminish as the aggregation duration increases but remain significant for intervals up to 15&#xa0;min. Additionally, the study identifies a threshold effect linked to wind speed, with standard rain gauges underestimating precipitation when wind velocities exceed 3–4&#xa0;m/s.</p>

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Evaluating rain gauge precipitation measurements using a giant rain gauge as a benchmark

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Andrea Petroselli,
  • Salvatore Grimaldi

摘要

Rain gauges are critical tools for measuring precipitation, yet they are prone to systematic errors due to factors such as undercatch, mechanical issues, and wind interference. To address these limitations, a "giant rain gauge" with a 100 m2 collection area was constructed at Tuscia University, Italy. This study analyzed over 300 rainfall events recorded between 2012 and 2022 to evaluate discrepancies between the giant rain gauge and standard rain gauges. The findings reveal notable differences in recorded precipitation, particularly over short time intervals. For aggregation durations of 5 and 10 min, discrepancies exceed 25% and 20%, respectively. These differences diminish as the aggregation duration increases but remain significant for intervals up to 15 min. Additionally, the study identifies a threshold effect linked to wind speed, with standard rain gauges underestimating precipitation when wind velocities exceed 3–4 m/s.