The theoretical down pipe diameter is shown for reference purposes only.
Box gutter sump depth.
To determine the box gutter depth is the first and foremost step for sizing components and materials for the roof drainage system which includes the rain heads and the box gutters.
The suggested down pipe diameter is shown for reference purposes only.
Choose an available size or any other size and enter that for the calculation of the sump.
The depth shown of the box gutter is the depth at the upstream end.
Here is a step wise guide for you to help.
Sump with high capacity overflow device.
The depth shown of the box gutter is the depth at the upstream end.
Choose an available dp size or any other size and enter that for the calculation of the sump.
The outlet must be no further than the diameter of the outlet to the centre of the outlet.
The line will correspond to a minimum box gutter depth.
Box gutter gradients shall not be flatter than 1 200 for sole widths equal to or less than 600mm wide.
The minimum depth required for the box gutters that make up this roof drainage system is 125 mm.
This will give a sump depth about 150mm.
Deviations from the gradient must be smooth and prevent towards the outlet without a proportional permanent ponding.
These options give provisions for overflow to the box gutter.