Hello,

The Mechanical and Plumbing engineers working on our project have provided us with the capacity of the rainwater tank as well as the volume of captured runoff in a 2 year 24 hour design storm (cf/storm) (needed for SS credit 6.1)

My question is, which methodology should be used in order to compute the annual captured rainwater and deduct it from the calculated flush fixture water use annual volume ?

Many thanks,