1. Scope

Keywords

Rationale

The recently developed standards for measuring performance of SCMs generates data for removal versus flow rate. In order to determine the performance of the SCM in real installations it is necessary to estimate the number and size of flows the SCM will be subjected to. This data can be extracted from the hydrograph for the site. The easiest method for calculating SCM performance is to determine a weighted average of the flow rates * removal at that flow rate. This standard will describe a way to generate appropriate weight factors. The New Jersey Corporation for Advance Technology (NJCAT) has developed a set of weights for NJ but the method is not clearly described in one place. Thus there is no method for consistently developing weight factors for other regions. Inconsistent weight factors can lead to inconsistent sizing and uncertainty as to whether or not the SCM will work as planned. This will be beneficial to manufacturers, regulators and end users in determining if an SCM will meet the desired/required performance over the course of an average year.