Forum » NC-2009 SSc6.1
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#### What is the acceptable testing standard for runoff coefficient.

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Panupant Phapant on Mar 30, 2015, 11:54 am

Dear All
We are the construction materials manufacturers. We wish to determine the runoff coefficient for our porous concrete product.

Can anyone advise what is acceptable testing...

#### P: avarage rainfall event

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by ESRA OZKONUKSEVER on Feb 11, 2015, 9:27 amTurkey

Hi everyone,
I got a question about the calculataion of Volume of captured run off;
In the formula,(V= P.A.R/12) P value is taken according to the location of project ; humid ,semi...

#### Volume Captured on the Stormwater Mgmt Calculator

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Kimberlee Dobbins on Jan 29, 2015, 4:30 pmUnited States

Going from LEED-EB 2.0 SS credit 5.1 to LEED 2009, O&M, what is the number for "Volume Captured"? Is it
a) "Stormwater management practices (structural detention facilities)" (gallons...

#### BMP area for a green roof

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Jamison Hill on Jun 25, 2014, 11:10 am

My project features raised green roof beds (6" deep soil) located directly downstream from a tin roof. There are no gutters and for the most part runoff from the roof runs directly into the roof...

#### case 1 option 2- "critical values"

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Carrie Laurendine on Sep 19, 2014, 10:31 am

page 95 of the LEED manual (description of case 1 - option 2) states that post development runoff rate and quantity must be below "critical values" for the relevant receiving waterways.

...

#### stormwater when site is directly on the river?

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Carrie Laurendine on Sep 19, 2014, 8:55 am

site is on the river. I assume this doesn't change anything, but civil engineer asked I check to see if LEED has exceptions for this. I guess the thought was that it might be strange to retain...

#### Stormwater rate and quantity calculation for case 1

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by sona prajapati on Sep 1, 2014, 3:08 am

Dear all,
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...

#### 1 year and 2 year 24 hr design storm

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by sona prajapati on Jun 15, 2014, 3:41 am

Michael DeVuono Regional Stormwater Leader Arcadis North America LEEDuser Expert 186 thumbs up June 16, 2014- 4:21 pm 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. Log in or register to post comments sona prajapati LEEDuser Basic Member 1 thumbs up August 25, 2014- 2:43 am Dear Michael, We have found a sample calculation to determine storm water rate and quantity for 1 yr-24 hr design...

#### Natural System Instead of Public Sewer.

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by JOSE R. TAGLE on Mar 21, 2014, 8:27 pm

Hi everyone!

We are working on previously undeveloped land project, which apply for case 1 “site with existing imperviousness 50% or less”. With the new project, the imperviousness will...

#### Storage Tanks, then release to municipal system ok?

##### NC-2009 SSc6.1: Stormwater design - quantity control
###### posted by Norma Lehman on Jun 25, 2014, 9:05 am

your comment above states: Is it an acceptable strategy to capture the rainwater into tanks and discharge it into the public sewers after the rainstorm reducing the peak discharge?
This is...