However by definition to have a sump somewhere along the gutter implies that there will be flow approaching the sump from two sides.
Box gutter sump overflow.
However a wider overflow may increase the length of the sump.
The side with the maximum flow is used to size the box gutter.
Overflow devices consider whether the discharge of the box gutter is to.
A a rainhead b a sump with a side overflow device.
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Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter.
The box gutter depth and the sump length are influenced by the size of the overflow.
Or c a sump with a high capacity overflow device.
The total flow is used to size the sump and overflow.
All domestic box gutters must be a minimum of 200mm wide and 75mm deep.
It is not necessary to use all quadrants or use vertical faces.
This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg.
Making the box gutter wider will also reduce the box gutter depth.
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A wider overflow needs less depth of overflow hence the box gutter depth will also be reduced.
The hydraulic capacity of these overflow devices must not be less than the design flow for the associated gutter outlet and must discharge to atmosphere.