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Areal Reduction Factors for Estimation of Design Rainfall Intensities for New South Wales and the Australian Capital Territory

机译：新南威尔士州和澳大利亚资本领土估算设计降雨强度的面积减少因素

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The Areal Reduction Factor (ARF) for a particular catchment area, given design rainfall burst duration and annual exceedance probability (AEP) represents the ratio between the areal design rainfall and the representative point design rainfall for the catchment. Australian Rainfall and Runoff (1987) recommended areal reduction factors based on studies in the United States. This paper describes the derivation of ARF equations for the last remaining region in Australia without specific ARFs, NSW and the ACT. Data from the entire period of daily rainfall record at more than 6000 sites across NSW and the ACT was assembled. Representative circular "catchments" were formed for areas between 125 and 8000 km~2 and the data were analysed for each of these catchment sizes to produce ARF estimates for each combination of duration between 1 and 5 days and AEP between 1 in 2 and 1 in 100. Two homogeneous regions were established in NSW and the ACT for estimation of ARFs, with the dividing line based on the predominant mechanisms of heavy precipitation. Separate equations were derived for both of these regions using the same functional form as in the other states. Interim equations were also derived, so that the ARF equations apply for all durations between 1 hour and 120 hours and catchment areas between 1 and 10,000 km~2. These revised ARF equations are consistent with recently developed equations for the adjoining states and are recommended for application by flood hydrologists and drainage designers working in NSW and ACT.
机译：的面积缩减因子（ARF）对于特定的集水区，给定的设计降雨脉冲串持续时间和年超过概率（AEP）表示的面设计降雨和集水代表点设计雨量之间的比率。澳大利亚降雨径流（1987）推荐的基础上在美国的研究面积缩减的因素。本文介绍ARF方程式澳大利亚仅存的地区没有具体的ARFs，新南威尔士州和ACT的推导。从日雨量记录在新南威尔士州和ACT超过6000点的整个时期的数据组装。代表圆形“集水”形成为125和8000公里之间的区域〜2和数据分析对每个这些集水尺寸以产生ARF估计持续时间的1介于1和5天，AEP之间在2和1中的每一种组合建立在新南威尔士州和ARFs的估计的ACT 100的两个均匀的区域，基于重沉淀的主要机制的分界线。单独的方程，推导出这两个区域使用相同的函数形式如在其它国。临时方程推导也，从而使ARF方程式申请1和万公里〜2之间1小时和120小时和集水区之间的所有持续时间。这些修订的ARF方程式与最近开发的方程毗邻的状态一致，并建议由洪水水文和排水设计师在新南威尔士州和ACT运行的应用程序。

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