Development of Intensity-Duration-Frequency (IDF) Curves is important for the design of various hydraulic structures such as culverts, dams, and stormwater drainage systems. In this paper, rainfall analyses are conducted to evaluate the effect of using rainfall records from different rain gauge types on IDF Curves construction. Rainfall data are collected from two recording rain gauges at Namman catchment in western Saudi Arabia. Using the available 13 years rainfall data of the two gauges, annual maxima rainfall series values are extracted and used for IDF curves computations. The rainfall gauge which is equipped with a siphon produced IDF curves with higher precipitation intensities in comparison with the other gauge. This indicates that the siphon mechanism plays an important role in decreasing the under-catchment amount of the tipping bucket gauges during heavy rainfall storms. The current study shows that the under-catchment amount of tipping-bucket rain gauges can have a significant impact on the IDF curves and the characteristics of the design storm. A correction relationship to adjust rain intensity data sets of recording rain gauges that are not furnished with siphons is proposed in this paper. The adjusted rainfall intensity values are utilized to construct reliable IDF curves.

强度-持续时间-频率（IDF）曲线的开发对于涵洞，水坝和雨水排放系统等各种水力结构的设计非常重要。本文进行了降雨分析，以评估使用不同雨量计类型的降雨记录对IDF曲线构建的影响。降雨数据是从沙特阿拉伯西部纳曼流域的两个记录雨量计中收集的。使用两个仪表的13年可用降雨数据，提取年度最大降雨序列值并将其用于IDF曲线计算。配备虹吸管的雨量计产生的IDF曲线相比其他雨量计具有更高的降水强度。这表明在大暴雨期间，虹吸机制在减少倾卸式斗规的集水量不足中起着重要作用。当前的研究表明，翻斗式雨量计的水位不足量会对IDF曲线和设计风暴的特征产生重大影响。本文提出了一种校正关系，用于调整未配备虹吸管的记录雨量计的雨强数据集。调整后的降雨强度值可用于构建可靠的IDF曲线。本文提出了一种校正关系，用于调整未配备虹吸管的记录雨量计的雨强数据集。调整后的降雨强度值可用于构建可靠的IDF曲线。本文提出了一种校正关系，用于调整未配备虹吸管的记录雨量计的雨强数据集。调整后的降雨强度值可用于构建可靠的IDF曲线。