It sounds like you have an overflow situation.
Box gutter sump overflow.
Rainheads are an essential design element for buildings where internal box or trough gutters are used.
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 box gutters must have independent overflow provision discharging to the atmosphere.
Read off sump depth 175.
It depends on the value of ioc.
Overflow devices consider whether the discharge of the box gutter is to.
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.
Box gutter sump size with vertical overflow.
It acts as an external overflow point to reduce water surges into the stormwater system and aid the flow of water down.
Box gutter procedure on roof of new 2 story house with flat roof top.
2015 3 7 4 layout.
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.
Layout box gutters must.
If the box gutter has no overflow provisions this causes a waterfall over the sides of the box gutter typically running down the walls.
A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof.
All domestic box gutters must be a minimum of 200mm wide and 75mm deep.
If draining to a sump with a side overflow somewhere along the box gutter use this calculator.
The hydraulic capacity of these overflow devices must not be less than the design flow for the.
All of the above options provide overflow provision to the box gutter.
A a rainhead b a sump with a side overflow device.
From before max flow 10l s.
Or c a sump with a high capacity overflow device.
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.
Outlets box gutter outlets must discharge through either a rainhead or sump.
The total flow is used to size the sump and overflow.
The outlet of the box gutter may be blocked by debris or the box gutter outlet simply cannot discharge the water fast enough.
The sump depth is not necessarily measured from the bottom of the bg.
