MGMA Gutter Calculator

Please complete the red boxes below to begin your calculation and print the results below.
All dimensions are specified in metres unless otherwise stated.

Sketch A








Sketch B




m2
m2
m2


Sketch C




m2
m2
m2
 

Flow Rate From Sketch B

England Flow Rate: 0.022 l/(s.m2)
Scotland / Wales / NI Flow Rate: 0.018 l/(s.m2)

l/s
l/s
l/s
l/s
l/s
l/s

Flow Rate From Sketch C

England Flow Rate: 0.022 l/(s.m2)
Scotland / Wales / NI Flow Rate: 0.018 l/(s.m2)

l/s
l/s
l/s
l/s
l/s
l/s


For further advice, please refer to MGMA Guidance Document GD18 MGMA gutter design flow chart

 

MGMA DISCLAIMER

These gutter calculations are for guidance only. They should be checked by a qualified engineer with appropriate insurance cover.

The Metal Gutter Manufacturers Association Limited and its member companies cannot be held responsible for any errors or inaccuracies and, in particular, the specification for any application must be checked with the individual manufacturer concerned for a given installation.