Box Gutter Sump Design

To do this we need 3 things what is the biggest storm we should design for.

Box gutter sump design.

Support the entire weight of the gutter and sumps when full of water as well as a trafficable load at any point in the gutter and sumps. A good box gutter design will have falls along its length together with sumps to collect water before it is fed into large downpipes. Outlets box gutter outlets must discharge through either a rainhead or sump. Establish the sump location this should be the lowest point in the box gutter.

Or c a sump with a high capacity overflow device. Layout box gutters must. Each box gutter run must discharge independently to ether a sump or directly out of the building without changing the size of the gutter or changing direction. If draining to a sump with a side overflow somewhere along the box gutter use this calculator.

However a wider overflow may increase the length of the sump. Rainheads are an essential design element for buildings where internal box or trough gutters are used. Making the box gutter wider will also reduce the box gutter depth. A wider overflow needs less depth of overflow hence the box gutter depth will also be reduced.

A a rainhead b a sump with a side overflow device. Overflow box gutters must have independent overflow provision discharging to the atmosphere. Method used the method used is based on the flow chart fig 3 1 as nzs 3500 3 2003 downpipe and sump depth from fig i4 with minimum sump depth 150mm. Refer to hints for box gutter design marking and cutting the sump spigot mark cut sump hole dress the cut out to neatly fit to the sump decide on the position of the spigot mark and cut the hole.

At this stage plan the connection to the downpipe. With building design being so restrictive on space these days this is the area where designers must think about how the roofing contractor will make the box gutter comply. To avoid problems plumbers need to calculate the hydraulic capacity of a box gutter and when designing overflow devices consider whether the discharge of the box gutter is to. Design a box gutter to an internal sump with a side overflow.

Box gutter design to as 3500 3 2015. The water is drained via downpipe nozzles or via a sumps downpipes built into it. Design a box gutter to an internal sump with a vertical overflow. The box gutter depth and the sump length are influenced by the size of the overflow.

Box gutter procedure on roof of new 2 story house with flat roof top.