How to use the Extra features of the Downpipe calculator.
to the Australian National Plumbing Code AS/NZS 3500.3-2021
This is a Powerpoint presentation which explains the extra features of the down pipe and eaves gutter calculator, and compares the results to doing it the hard way, with the Plumbing Code.

It is viewable online with any device and does not need any special software to view. Just click each slide to proceed. (It opens in a separate window)

In particular it explains how the printout works and what it does.