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Design floods for all of Canada

机译：为全加拿大设计洪水

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Preliminary design flood flows have been derived for 24,000 locations throughout Canada on rivers with catchments larger than 400km(2). In the absence of any published consistent method for flood estimation covering Canada, a flood frequency analysis of instantaneous and daily annual maximum flows at 1664 gauging stations has been regionalized using geostatistical methods. The methodology accounts, in a generalized way, for unusual catchments including arid areas in the Prairie Provinces, the influence of extensive lakes, and (implicitly) for the effects of snowmelt. It does not attempt to represent other more local effects such as flow regulation and diversion. Cross-validation has shown that the results exhibit little bias and at half of all locations the predicted results are within 25% of those calculated from the flood peak data, for floods with annual exceedance probabilities of both 1 in 2 and 1 in 20. This broad-scale analysis, which was performed as part of a flood mapping study, helps to pave the way for the development of a unified procedure for flood frequency analysis across Canada, which forms part of the FloodNet research initiative.
机译：初步设计洪水流量已在全加拿大24,000个地点的集水量大于400 km（2）的河流上产生。在没有覆盖加拿大的任何已公布的一致的洪水估算方法的情况下，已使用地统计方法对1664个测量站的瞬时和每日年度最大流量的洪水频率分析进行了区域划分。该方法以广义的方式解释了不寻常的流域，包括草原省的干旱地区，大片湖泊的影响，以及（隐含的）融雪的影响。它不试图代表其他更局部的影响，例如流量调节和转移。交叉验证显示，对于年均概率超过1比2和1比20的洪水，预测结果几乎没有偏差，且在所有位置的一半中，预测结果都在从洪峰数据计算得出的结果的25％以内。作为洪水地图研究的一部分进行的大规模分析，为整个洪水频率分析的统一程序的开发铺平了道路，这是FloodNet研究计划的一部分。

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