Design a box gutter to an internal sump with a vertical overflow.
Box gutter sump design.
Sizes the depth shown of the box gutter is the depth at the upstream end.
A sump with a high capacity overflow device.
A box gutter is defined as a graded channel generally of a rectangular shape for the conveyance of rainwater within the building footprint including adjacent to a wall or parapet.
Rainheads are an essential design element for buildings where internal box or trough gutters are used.
Must have a constant slope between 1 40 and 1 200.
Sumps are to be appropriately sized in accordance with as nzs 3500 3 with a minimum length of 400 mm and when fitted with a high capacity overflow device with a depth of not less than 150 mm when either one or two box gutters enter the sump.
The esthetics of the box gutter hid the gutter from sight which was important during that time.
Find the design rainfall.
A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof.
All of the above options provide overflow provision to the box gutter.
Design a box gutter to an internal sump with a side overflow.
Low and behold the box gutter is rotted out.
Sides must be vertical.
To do this we need 3 things what is the biggest storm we should design for.
The old box gutters worked great in the day.
The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep.
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.
Box gutter and rain water head at end of box gutter allowance for vertical faces and catchments on both sides of box gutter.
A a rainhead b a sump with a side overflow device.
Suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments.
A slate tile roof connecting to the box gutter and then to the copper spouts.
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.
Box gutter design to as 3500 3 2015.
Or c a sump with a high capacity overflow device.
A sump with a side overflow device.