Box Gutter Sump Overflow

All domestic box gutters must be a minimum of 200mm wide and 75mm deep.

Box gutter sump overflow.

This free online box gutter calculator will calculate the size of box gutters and sumps with a side overflow in accordance with the australian plumbing code as nzs 3500 3 2003 part 3 storm water drainage. 2015 3 7 4 layout. Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter. Method used the method used is based on the flow chart fig 3 1 as nzs 3500 3 2003 downpipe and sump depth from fig i4 with minimum sump depth 150mm.

A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof. Read off sump depth 175. The hydraulic capacity of these overflow devices must not be less than the design flow for the. A a rainhead b a sump with a side overflow device.

If draining to a sump with a side overflow somewhere along the box gutter use this calculator. All of the above options provide overflow provision to the box gutter. Rainheads are an essential design element for buildings where internal box or trough gutters are used. From before max flow 10l s.

The side with the maximum flow is used to size the box gutter. It acts as an external overflow point to reduce water surges into the stormwater system and aid the flow of water down. Box gutter sump size with vertical overflow. It depends on the value of ioc.

The total flow is used to size the sump and overflow. The sump depth is not necessarily measured from the bottom of the bg. Intersect with chosen dp choose 125 dia. This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg.