Box gutter procedure on roof of new 2 story house with flat roof top.
Box gutter sump overflow.
From before max flow 10l s.
If the box gutter has no overflow provisions this causes a waterfall over the sides of the box gutter typically running down the walls.
All of the above options provide overflow provision to 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.
Overflow devices consider whether the discharge of the box gutter is to.
Overflow box gutters must have independent overflow provision discharging to the atmosphere.
The total flow is used to size the sump and overflow.
It depends on the value of ioc.
Box gutter sump size with vertical overflow.
All domestic box gutters must be a minimum of 200mm wide and 75mm deep.
The hydraulic capacity of these overflow devices must not be less than the design flow for the.
Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter.
Or c a sump with a high capacity overflow device.
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.
2015 3 7 4 layout.
A a rainhead b a sump with a side overflow device.
Rainheads are an essential design element for buildings where internal box or trough gutters are used.
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.
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.
If draining to a sump with a side overflow somewhere along the box gutter use this calculator.
Layout box gutters must.
The sump depth is not necessarily measured from the bottom of the bg.
The outlet of the box gutter may be blocked by debris or the box gutter outlet simply cannot discharge the water fast enough.
Support the entire weight of the gutter and sumps when full of water as well as a trafficable load at any point in the gutter and sumps.
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.
