Instructions & Notes:
This program only calculates the change in box gutter depth due to placing the overflow at the opposite end to that assumed by the plumbing code, i.e. placing the overflow at the upstream end instead of the downstream end.
Therefore, one of the other programs must be used to calculate the flow, rainwater head, and downpipe size etc.
I have found this requirement to come up surprisingly often in practise. A downpipe on the facade maybe acceptable, but the building designer may not like the look of, (or the operation of) a spitter in this location.
DISCLAIMER: It is the users responsibility to ensure input data is calculated and entered correctly, and that the program is
suitable for the roof configuration required. This configuration is also outside the scope of the Australian Plumbing Code AS/NZS 3500.
OTHER HYDRAULIC CALCULATORS