






Designed By: BTW 


Job no 007 



1st Jan 2000 









EAVES GUTTER AND DOWNPIPE DESIGN
Using formulas developed by the CSIRO.


INDUSTRIAL BUILDING FOR BLOGS INVESTMENTS: DP's 26 
Somewhere Lane, Somewhere Else. 


AS/NZS 3500.3 allows for all roof designs, and as such must allow for the worst case.
This method allows for the location of bends and downpipe, along the line of the gutter.
For instance, if a bend was positioned
close to the DP, and the DP situated at the end of the gutter, this method will give a result equivalent to the Plumbing Code.
This Design complies with "Roof Drainage by K G Martin" Division of Building Research, CSIRO.




Catchment area 
A 
= 
100 
sq.m 

Intensity 
I 
= 
222 
mm/hr 

Coefficient of Runoff 
I 
= 
1 


Roof Slope 
S 
= 
5 
deg. 

Roof Slope Factor 
Sf 
= 
1 + 0.5*tan(Roof Slope) 



= 
1.04 


Design Catchment Area 

= 
Sf * A 




= 
104.37 


Design Flow 
Q 
= 
C*I*A/3600 
L/s 



= 
1 * 222 * 104.37/3600 



= 
6.44 
L/s 


Find Gutter Design Coefficient "x" 





Is gutter slopping of level? 

= 
sloping 


Bend distance from DP 

= 
>3.6 
m 

DP location along gutter 

= 
end 


Using the above data from Table 2 
x 
= 
0.4 







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