Code box gutter requirements the minimum width allowed for domestic projects is 200mm.
Box gutter sump.
This is a good size for the required flow.
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.
Choose an available size or any other size and enter that for the calculation of the sump.
Down pipe must be.
It is easier to mark and cut the spigothole prior to fitting the sumpinto the box gutter.
Sides must be vertical.
The outlet must be no further than the diameter of the outlet to the centre of the outlet.
Box gutters must be straight no bends.
Overflow devices need to discharge to the atmosphere in such a way as to prevent damage to buildings and property.
The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep.
For the associated box gutter outlet.
For commercial projects the minimum allowable width is 300mm.
Must have a constant slope between 1 40 and 1 200.