The rectangular overflow width is equal to the box gutter width less 100mm.
Box gutter sump size.
Flow as the down pipe.
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.
Learn more how to storm water design for building sites.
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.
The depth shown of the box gutter is the depth at the upstream end.
This will give a sump depth about 150mm.
For the associated box gutter outlet.
If draining to a sump with a vertical overflow in the middle of the box gutter use this calculator.
The suggested down pipe diameter is shown for reference purposes only.
How much fall should i have on a box gutter.
However if you choose to go above 16l s the downpipe may get larger than 150 dia.
Colorbond box gutter measures 150mm x 150mm x 150mm.
Box gutter gradients shall not be flatter than 1 200 for sole widths equal to or less than 600mm wide.
The gutter collects the water and disposes of it through the drainpipe.
50mm clearance on both sides.
Deviations from the gradient must be smooth and prevent towards the outlet without a proportional permanent ponding.
The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep.
A box gutter is given its name as it is usually boxed into the middle or edge of the roof.
Overflow devices need to discharge to the atmosphere in such a way as to prevent damage to buildings and property.
Sumps can be made to order but are commonly manufactured in either 100mm and 150mm depths.
Choose an available dp size or any other size and enter that for the calculation of the sump.
Trial box gutter width the minimum width allowed for commercial projects is 300mm for domestic projects 200mm.
Sumps are usually attached between a box gutter and the downpipe.
The outlet must be no further than the diameter of the outlet to the centre of the outlet.
If this is the case the sump length will increase to accommodate the downpipe.
Where there is more than one overflow the design flow is divided equally and the spitter size shown will also be the suggested dp size for this fraction of the flow.
They collect storm water before it is carried away by the downpipe and they also serve to catch any debris before it enters the downpipe.
