DESIGN of EAVES GUTTERS, BOX GUTTERS & DOWNPIPES
to the Australian National Plumbing Code AS/NZS 3500.3.2:2003
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Diagramatic of eaves gutter and downpipe DOWNPIPE AND EAVES GUTTER CALCULATOR
box gutter at end diagramatic BOX GUTTER AND RAIN WATER HEAD
AT END OF BOX GUTTER
(Simplified)
  Suitable for flattish roofs with little or no vertical faces
  or steep roofs draining to one side of box gutter only
  or any roof if you are in a hurry and make the necessary
  allowances for all catchments.
Rainwater head and box gutter BOX GUTTER AND RAIN WATER HEAD
AT END OF BOX GUTTER

  Allowance for vertical faces and catchments
  on both sides of box gutter.
Sump diagramatic with side overflow BOX GUTTER AND SUMP
WITH SIDE OVERFLOW

  Allowance for vertical faces and catchments
  on both sides of box gutter.

Sump with vertical overflow BOX GUTTER AND SUMP
WITH VERTICAL OVERFLOW

  Allowance for vertical faces and catchments
  on both sides of box gutter.

pipe diagramatic PIPE SIZE CALCULATOR
  Including "Charged" Downpipes and
  pipes draining to tanks, watercourses etc.
Overland flow Diagramatic OPEN CHANNEL, OVERLAND FLOW CALCULATOR
Map of Australia 1:100 Year Rainfall Intensity Map
At this stage, users outside of Australia will have to find
the design rainfall intensity from their own local Authority,
Bureau of Meteorology, the internet, or other sources.

THE FOLLOWING CALCULATORS ARE OUTSIDE
THE SCOPE OF THE PLUMBING CODE;
BUT ARE VERY USEFUL IN PRACTISE.

Spitter at upstream end diagramatic SPITTER AT UPSTREAM END
(PLUMBING CODE USES DOWNSTREAM END)
  Requires flow to be calculated in one of the
  other calculators.
Non rectangular box gutter diagramatic NON RECTANGULAR BOX GUTTERS
Code only allows for rectangular box gutters.
Requires flow to be calculated in one of the other calculators.
Almost any shape with maximum of 5 sides can be used.