Design of Gutter
Area of Roof40SqmIntensity of rainfall0.15mtrsNumber of Gutters1no
Gutters will be provided on the longer side of the roof.Each gutter will have 2 outlets
Number of outlets in the gutter1nosTotal number of outlets1Width of gutter400mm( assumed)Discharge Q1.666667lpsA4807.851SqmmDepth of water at outlet12.0196313mm (say)Total depth = 2 times depth of water + free board ( 60 mm)Total depth =86mmSize of gutter
Width of gutter400mmDepth of gutter86mmsay100mm
 
Design of Gutter
Area of Roof70SqmIntensity of rainfall0.15mtrsNumber of Gutters2no
Gutters will be provided on the longer side of the roof.Each gutter will have 2 outlets
Number of outlets in the gutter1nosTotal number of outlets2Width of gutter300mm( assumed)Discharge in Gutter QRoof area ( sqm) * Rainfall intensity ( m) * 1000 ( litres/sec) 60*60 * number of outlets ( no )Area of gutter A in sqmm(Q^2* Width of gutter /10000)^0.0333Discharge Q1.458333lpsA3996.239SqmmDepth of water at outlet13.320814mm (say)Total depth = 2 times depth of water + free board ( 60 mm)Total depth =88mmSize of gutter
Width of gutter300mmDepth of gutter88mmsay150mm
Size of rain water pipe
83
mm
Say.
110mm
of 2