Hello to all Leed users,

I am new at this credit. I have a project in which I want to implement Option 1.

I have understood how the 90th percentile and the runoff site are calculated, but I find it hard on the calculation of run off volume calculation.

In the reference guide there are 3 metodologies listed: a) Modified rational mehtod b)TR-55 natural resources c) TR-55 tabular hydrograph

Is there a specific software used for this?  Any help would be appreciated.

Many Thanks

Konstantina