Minimum Box Gutter Depth

Namely the ratio of the gutter s length to its width.

Minimum box gutter depth.

Due to differences in the freeboard requirements in this instance the deepest box gutter is required and used in the program. 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 3 to prevent internal flooding or damage to the building or contents see figure 2. The depth shown of the box gutter is the depth at the upstream end. Gutter material n gutter cross section area a hydraulic radius rh and gutter slope s.

Hydraulic designers sizing roof drainage know all too well about h 2h dg and dmax which were easy to work into. Have adequate overflow provision at all rain heads and sumps. Minimum box gutter depth. Deviations from the gradient must be smooth and prevent towards the outlet without a proportional permanent ponding.

The roof area efficiently drainable by a gutter is proportional to q. 2015 3 7 4 layout. The minimum depth required for the box gutters that make up this roof drainage system is 125 mm. Discharge at the downstream end without a change in direction ie not through side chute.

The suggested down pipe diameter is shown for reference purposes only. I decided to use the kg martin method for sizing from the csiro experimental building notes 1978. Trial box gutter width the minimum width allowed for domestic projects is 200mm. This will give a sump depth about 150mm.

The line will correspond to a minimum box gutter depth. Now that you know how to determine the minimum depth of the box gutter help joe determine the minimum depth of the gutters for the luxury apartment building s roof drainage system. Choose an available dp size or any other size and enter that for the calculation of the sump. All domestic box gutters must be a minimum of 200mm wide and 75mm deep.

Have a minimum width of no less than 200mm for a domestic box gutter 300 mm for commercial. Have a depth at the high end of not less than 75mm. Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter. Box gutter gradients shall not be flatter than 1 200 for sole widths equal to or less than 600mm wide.

Box gutters should have a minimum fall of 1. Note it is possible in a wide box gutter for the depth to be shallower than for box gutters with a free outfall. This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg. However to this manning term has to be applied a correction based on the aspect ratio of the gutter.