Overflow devices need to discharge to the atmosphere in such a way as to prevent damage to buildings and property.
Box gutter sump size.
The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep.
Down pipe must be vertical from sump not to the side minimum sump length is 400mm.
Sumps are usually attached between a box gutter and the downpipe.
Trial box gutter width the minimum width allowed for domestic projects is 200mm.
The outlet must be no further than the diameter of the outlet to the centre of the outlet.
If draining to a sump with a vertical overflow in the middle of the box gutter use this calculator.
Sump with a side overflow device sumps do require an increase in the depth of flow in the box gutter and gutters are to be fitted with either.
Sides must be vertical.
A box gutter is given its name as it is usually boxed into the middle or edge of the roof.
Trial box gutter width the minimum width allowed for commercial projects is 300mm for domestic projects 200mm.
Custom design the width of the rain water head can be increased to any width.
For commercial projects the minimum allowable width is 300mm.
But cannot be reduced to less than the box gutter width.
The gutter collects the water and disposes of it through the drainpipe.
Vertical faces enter the full vertical face area.
Box gutter gradients shall not be flatter than 1 200 for sole widths equal to or less than 600mm wide.
The rectangular overflow width is equal to the box gutter width less 100mm.
Experiment with this figure to get the depth of box gutter you require.
Downpipe eaves gutter long straight eaves gutters box gutter to rain water head box gutter vertical faces box gutter side o flow box gutter vertical o flow storm water pipe size storm water network overland flow path spitter upstream end custom rain water head.
How much fall should i have on a box gutter.
Learn more how to storm water design for building sites.
Must have a constant slope between 1 40 and 1 200.
Box gutters must be straight no bends.
For the associated box gutter outlet.
However any width can be entered.
Tapered from the bottom of the box gutter to the downpipe if required.
50mm clearance on both sides.
Sumps can be made to order but are commonly manufactured in either 100mm and 150mm depths.
Colorbond box gutter measures 150mm x 150mm x 150mm.
Deviations from the gradient must be smooth and prevent towards the outlet without a proportional permanent ponding.
Sizes the depth shown of the box gutter is the depth at the upstream end.
Experiment with this figure to get the depth of box gutter you require.
