The side with the maximum flow is used to size the box gutter.
Box gutter sump overflow.
All of the above options provide overflow provision to the box gutter.
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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.
All domestic box gutters must be a minimum of 200mm wide and 75mm deep.
The total flow is used to size the sump and overflow.
Making the box gutter wider will also reduce the box gutter depth.
However by definition to have a sump somewhere along the gutter implies that there will be flow approaching the sump from two sides.
A a rainhead b a sump with a side overflow device.
2015 3 7 4 layout.
However a wider overflow may increase the length of the sump.
Or c a sump with a high capacity overflow device.
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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.
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.
This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg.