Initial Water Storage

This is a very good question. It is a pity that nobody could respond

I don't know much about TR-55 either, but on a recent project our civil engineer said they did not typically calculate this. They provided a brief narrative for the worksheet about the stormwater evaluations they DID do, and the credit was awarded without comment. Essentially they showed the project team was meeting the credit intent of assessing the stormwater volume/rate/runoff vs infiltration potential and responding to it, if not using the specific method listed in the credit language. 

See link:

TR-55 Cover (usda.gov)

Got an updated link, Gang?

https://www.caee.utexas.edu/prof/maidment/CE365KSpr15/Docs/TR55Manual.pdf

I'm surprised that there is still no answer to this. 

Want do they want us to put in for this: "Estimated TR-55 initial water storage capacity".
My SWM designers completed their design per MD standards and received concept approval from the state, and they do not know what USGBC wants them to do for this number. 

Hi Brian,

Luckily there is a simple answer to this now! Upgrade the credit to v4.1. The only change in this credit between v4 and v4.1 is that they removed the TR-55 reference and instead ask more general questions about rainwater. 

@Emily..   Does this mean there is a new v4.1 Site Assessment Worksheet available somewhere?

Haven't seen a new one, but I have successfully submitted the v4 worksheet with "The TR-55 requirement was removed in v4.1" entered in the TR-55 box and the v4.1 rainwater info captured either there or elsewhere in the sheet. 

Well that helps a lot, thanks