The total flow is used to size the sump and overflow.
Box gutter sump overflow.
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.
The box gutter depth and the sump length are influenced by the size of the overflow.
Overflow devices consider whether the discharge of the box gutter is to.
Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter.
However by definition to have a sump somewhere along the gutter implies that there will be flow approaching the sump from two sides.
Making the box gutter wider will also reduce the box gutter depth.
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A a rainhead b a sump with a side overflow device.
It is not necessary to use all quadrants or use vertical faces.
Overflows in box gutter this has become a big issue in the past 18 months particularly in victoria and is outlined in a new section in the current update to the ncc.
A wider overflow needs less depth of overflow hence the box gutter depth will also be reduced.
However a wider overflow may increase the length of the sump.
This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg.
The side with the maximum flow is used to size the box gutter.
2015 3 7 4 layout.
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