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NC-2009 SSc6.1:Stormwater Design—Quantity Control

1 year and 2 year 24 hr design storm

In case 1, we are required to perform a site run off calculation for 1 yr-24 hr design storm and 2 yr-24 hr design storm for both pre- and post- development period. can you pls clarify how this actually determines the cf/storm quantity? We are having difficulty understanding the difference.

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Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Mon, 06/16/2014 - 20:21

Stormwater runs off with a rate and volume. How this rate and volume is determined requires about 9 semester hours of hydrology courses, and is beyond the scope of this forum. I recommend you consult with a civil engineer to perform this work for your project.

Mon, 08/25/2014 - 06:43

Dear Michael, We have found a sample calculation to determine storm water rate and quantity for 1 yr-24 hr design storm and 2 yr-24 hr design storm from www.illinoisfloods.org/.../4D_Stormwater%20Volume%20and%20Treat.... We would like to know about the process followed in this website is correct for the solution or not?

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