Hi, there has been some previous discussion in this topic, but no definite answer has been given. Example 2 in the ref. guide uses 1" storm, referring to it as 90% of the average rainfall event. However, the credit requirement for SSc 6.1 requires the usage of the 24hr storms. It is quite confusing whether this calculation would meet the requirement, which they give as an example. Can we use the 90% of the annual rainfall events??
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Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
187 thumbs up
June 4, 2014 - 1:03 pm
This credit uses the 1 and 2-year 24-hour design storm for your project area.
That example simply shows that the raingarden being designed, holds the volume of 1" runoff, which coincidentally is the 90th percentile storm. The examples do not set the credit requirements, the requirements page does that.