CALCULATE THE BOX GUTTER SIZE WITH A SPITTER AT THE UPSTREAM END
NOTE: AS 3500.3.2:2003 "Stormwater Drainage Acceptable Solutions"
requires the spitter or overflow to be at the downstream end.
So this program is outside the scope of the code.

LOAD AND RUN CALCULATOR

Spitter Diagramatic

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.

MINIMUM WIDTH = 300 mm for Commercial construction, and 200 mm for Domestic consruction.
REQUIRED GUTTER SLOPE 1:40 TO 1:200

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