Catchment Area

The effective catchment area for a gutter is determined not only by the plane area of the roof itself but also by the walls adjacent to the roof. When a wall is discharging on to a roof, half the surface area of that wall (up to a maximum height of 10 m), must be added to the catchment calculation.

Revision Category: 
2 - Editing and rearrangement
Revision Detail: 

Caluse has been completely revised. All calculations are now under a new clause Capacity Calculations.

Draft Clause: