Box Gutter Sump
The depth shown of the box gutter is the depth at the upstream end.
Box gutter sump. It is easier to mark and cut the spigothole prior to fitting the sumpinto the box gutter. Box gutters must be straight no bends. Code box gutter requirements the minimum width allowed for domestic projects is 200mm. 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 outlet must be no further than the diameter of the outlet to the centre of the outlet. Must have a constant slope between 1 40 and 1 200. The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep. The theoretical down pipe diameter is shown for reference purposes only.
Overflow devices need to discharge to the atmosphere in such a way as to prevent damage to buildings and property. Down pipe must be. For commercial projects the minimum allowable width is 300mm. Choose an available size or any other size and enter that for the calculation of the sump.
The mod tec gutta sump can be fit ted simply from within the fitted box gutter this assists the accurate locating of the sump. This is a good size for the required flow.