Box Gutter Sump Depth

This is a good size for the required flow.

Box gutter sump depth.

Discharge through either a rainhead or sump. The depth shown of the box gutter is the depth at the upstream end. Architects and draftsmen are reminded that any roof drainage system including box gutters and eaves gutters need to be designed and installed with an appropriately sized overflow. The depth shown of the box gutter is the depth at the upstream end.

Have a minimum depth of 75mm at the high end. Choose an available size or any other size and enter that for the calculation of the sump. Have a sole width which is not reduced discharge at the downstream end without. Figure 1 as an alternative the top of the rainhead may be installed so that it is no higher than 50 per cent of the flow depth of the box gutter consistent with saa hb39 installation code for metal roof and wall cladding section 5 clause 5 7 3 and figure 5 7 3to prevent internal flooding or damage to the building or contents see figure 2.

2015 3 7 4 layout e for the sump high capacity overflow device the depth of the sump hs shall be not less than 150 mm regardless of the position of the normal outlet. This will give a sump depth about 150mm. The suggested down pipe diameter is shown for reference purposes only. All domestic box gutters must be a minimum of 200mm wide and 75mm deep.

The sole width of the box gutter is not to be reduced towards the outlet without a proportional increase in depth.