Forum » NC-2009 SSc6.1
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#### Runoff volumes

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Gregory Hurst on Sep 21, 2009, 6:50 pm

The key for volume calculation is knowing the 1 and 2-year, 24 hour storm depth. This is calculated fordifferent locations and it is a long process and it is not the same as calculating runoff...

#### Case 1, Option 1

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Randall Brookshire on Jun 15, 2010, 10:27 am

There is a point of contention within my office that I'm hoping can be cleared up by posting here. When considering the "1- and 2-year 24-hour design storms", is it possible to meet the quantity...

#### measurement of imperviousness

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Jean Marais on May 7, 2010, 5:13 am

?
"Impervious surfaces have a perviousness of less than 50% and promote runoff of water instead of...

#### Stream Channel Protection? (case 1, option 2)

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Joshua Radoff on Apr 30, 2010, 1:13 pm

Has anyone out there had any success using the Stream Channel Protection option (Option 2 for CASE 1) where the existing impervious is less than 50%?

I've got an urban project (in Denver...

#### Calculations for SSc6.1

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Gregory Hurst on Jan 10, 2010, 6:42 pm

Calculation of a 2-year, 24 hour storm is a lengthy process. See my comments above on this issue. Rainfall amounts, especially for one year, will not provide you with a 2-year, 24 hour storm...

#### calculation of Cr 6.1 Stormwater design-Quantity Control

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Gregory Hurst on Jan 5, 2010, 4:00 pm

Your calculations are correct. You will have to develop strategies to infiltrate, evapotranspire, or...

#### Working through the rational

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Jean Marais on Sep 17, 2009, 4:42 am

Working through the rational method, I've calculated the Time of Concentration (Tc), then itterated using IDF (intensity-duration-frequency) charts until the duration = time of concentration (...