GUTTER CAPACITY CALCULATION
Input roof catchment size for one outlet (m) 8.4m width 34.3m lenght
Roof Catchment Area(m2) 289m2
8.4m x 34.3m = 288.12m2 per RWDP
Rainfall Intensity (mm/hr) (Malaysia) 325mm/hr
Total cross section area of gutter 65790mm2
Gutter width based on structural design/site condition 300mm
Min Average gutter height including 25mm freeboard 245mm
(between lowest & highest point)
Gutter gradient 1:200
Minimum gutter girth (mm) For 1.0mm thick Zincalume gutter 814mm
Minimum gutter size = 300mm(W) x 300mm (D) 900mm
CAPACITY FOR EAVE GUTTER
Downpipe Capacity for Eave Gutter
Cross section of RWDP for EAVE gutter = 95mm2 x Roof Catchment
Based on above roof catchment,
The requierd cross section of RWDP 27455 mm2
Min Recommendation diameter for RWDP = 200mm
CAPACITY FOR INTERNAL BOX GUTTER
Cross section of RWDP for Internal Box gutter = 95mm2 x Roof Catchment
Based on above roof catchment,
The requierd cross section of RWDP 27455 mm2
Min Recommendation diameter for RWDP = 200mm
Maybe you would find the above calculations useful.
5 comments:
HI, thanks for your calculation, although it's a bit complicated, I just want to know the minimum size.. thanx
Architecture - Occupancy Load auto-calculator here :
http://archi2u.blogspot.com/
can show in more detail?
such as how u get the figure or formula explained?
Hi,
There are several determining factors for the rainwater catchment:
1. Rain Volume
2. Roof Area
3. Gutter Gradient
You can reference to
http://www.roof-gutter-design.com.au/boxgrwhvf/boxg2calc.html
in the "Cross section of RWDP for EAVE gutter = 95mm2 x Roof Catchment" formula, can you please explain where did you get the 95mm2 value?
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