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Evaluation of Stormwater Control Measure Performance Uncertainty

机译：评估雨水控制措施性能不确定性

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摘要

The percentage removal metric is widely used in engineering practice for stormwater control measure (SCM) selection and design, because it has been adopted by regulatory agencies and because it is straightforward to use for load reduction calculations. Various studies have shown that the metric is poorly suited to the episodic and stochastic nature of stormwater flows, but the extent of uncertainty introduced by the use of the metric has not been quantified. This study evaluated SCM performance uncertainty for total phosphorus (TP), total nitrogen (TN), and total suspended solids (TSS) load reduction in 14 regulator-defined SCM categories, based on data from 176 SCM monitoring studies aggregated using a subjective weighting scheme. Uncertainty was characterized according to the cumulative distribution of percentage removal values from these studies, and defined as the probability that SCMs will perform equal to or below credit values. SCM uncertainty based on these probabilities ranged from 0 to 0.95 and was generally between 0.31 and 0.84, although data were limited for several SCM categories. Probabilities that percentage load reduction was less than or equal to zero ranged from 0 to 0.61, and were generally between 0 and 0.30 across all SCM categories. Probabilities that TSS removal was less than or equal to 80% were generally between 0.35 and 0.77.
机译：拆除度量百分比广泛用于雨水控制措施（SCM）选择和设计的工程实践中，因为它已被监管机构采用，因为用于减少负载计算是直接的。各种研究表明，该度量适用于雨水流动的情节和随机性质，但通过使用指标引入的不确定性程度尚未被量化。本研究评估了总磷（TP），总氮（TN）和总悬浮固体（TSS）负载减少14个调节器定义的SCM类别的SCM性能不确定性，基于来自使用主体加权方案的176个SCM监测研究的数据。不确定性根据这些研究的累积分布的累积分布，并且定义为SCM将等于或低于信用价值的概率。基于这些概率的SCM不确定性范围为0至0.95，通常在0.31和0.84之间，尽管数据有限于几种SCM类别。百分比负载减小率小于或等于零的概率范围为0至0.61，并且通常在所有SCM类别中介于0到0.30之间。 TSS去除小于或等于80％的概率通常在0.35和0.77之间。

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