The collection and management of hydrological data in Italy has been dealt with at national level, initially, by the National Hydrological Service (SIMN), and at regional level in the last 40 years. This change has determined problems in the availability of complete and homogeneous data for the whole country. As of 2020, an updated and quality-controlled dataset of the historical annual maxima rainfall in Italy is still lacking. The Italian Rainfall Extreme Dataset (I-RED) has recently been created to allow studies to be performed with a homogeneous dataset at a national level. In this paper, the methodological approach adopted to build an improved and quality-controlled version of I-RED (in terms of both the rainfall depth values and the position of the rain gauges) is presented. The new database can be used as a more reliable research support for the frequency analysis of the rainfall extremes. This new I2-RED database contains rainfall annual maxima rainfall of 1, 3, 6, 12 and 24 h from 1916 until 2019, counts 5265 rain gauges and has been corroborated by a re-positioning and elevation-checking of 15% of the stations. A descriptive analysis of the maximum values of the stations, which provides an additional quality check and reveals different intriguing spatial features of Super-Extreme rainfall events, is also presented.

中文翻译：

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I2-RED：意大利年度极端降雨数据集的大规模更新和质量控制

意大利水文数据的收集和管理在国家层面进行处理，最初由国家水文局 (SIMN) 处理，在过去 40 年中在区域层面进行处理。这种变化决定了在全国范围内获得完整和同质数据的问题。截至 2020 年，仍然缺乏意大利历史年度最大降雨量的更新和质量控制数据集。最近创建了意大利降雨极端数据集 (I-RED)，以允许在国家层面使用同质数据集进行研究。在本文中，介绍了用于构建 I-RED 的改进和质量控制版本（在降雨深度值和雨量计的位置方面）所采用的方法论方法。新数据库可为极端降雨频率分析提供更可靠的研究支持。这个新的 I2-RED 数据库包含从 1916 年到 2019 年的 1、3、6、12 和 24 小时的年降雨量最大值降雨量，计数 5265 个雨量计，并已通过重新定位和 15% 的站点的高程检查得到证实. 还介绍了对站点最大值的描述性分析，该分析提供了额外的质量检查并揭示了超极端降雨事件的不同有趣空间特征。