Box Gutter Sump Design

Design a box gutter to an internal sump with a side overflow. Sizes the depth shown of the box gutter is the depth at the upstream end. A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof.

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A sump with a side overflow device.

Box gutter sump design.

Low and behold the box gutter is rotted out. A a rainhead b a sump with a side overflow device. Find the design rainfall. 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.

A slate tile roof connecting to the box gutter and then to the copper spouts. The esthetics of the box gutter hid the gutter from sight which was important during that time. 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 vertical overflow.

The issue today is the copper would disappear not counting the cost to reinstall. Down pipe must be vertical from sump not to the side minimum sump length is 400mm. Must have a constant slope between 1 40 and 1 200. Rainheads are an essential design element for buildings where internal box or trough gutters are used.

The old box gutters worked great in the day. 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. To do this we need 3 things what is the biggest storm we should design for. Or c a sump with a high capacity overflow device.

Box gutters must be straight no bends. Box gutter and rain water head at end of box gutter allowance for vertical faces and catchments on both sides of box gutter. Sides must be vertical. All of the above options provide overflow provision to the box gutter.

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. 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. A sump with a high capacity overflow device. Box gutter design to as 3500 3 2015.

The minimum size of a sump is 400mm x 200mm minimum width of box gutter and 150mm deep.

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