As part of NYC's blue roof requirement, roofs must provide 24 hour detention detention for the 2-yr design storm and an equivalent peak runoff rate equal to a curve # of approx 50 for projects discharging into a combined sewer. However the template only looks at runoff volume pre versus post. How do I convert my runoff rate into a runoff volume? Multiply by 24?
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Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
188 thumbs up
January 23, 2014 - 5:40 pm
Rate does not convert to volume. Have your CE develop a hydrograph which will give you the volume.