The effective roof area can be calculated by using the following formula:
Roof pitch | 10° | 12.5° | 15° | 17.5° | 20° | 22.5° | 25° | 27.5° | 30° | 32.5° | 35° | 37.5° | 40° | 42.5° | 45° | 47.5° |
Factor | 1.088 | 1.111 | 1.134 | 1.158 | 1.182 | 1.207 | 1.233 | 1.260 | 1.288 | 1.319 | 1.350 | 1.384 | 1.419 | 1.459 | 1.500 | 1.547 |
For roofs of 50° or more and walls, the factor of 1,600 should be used
Gutter flow capacity is dependent upon system type, outlet position and whether gutter is laid level or to a specified fall. The table above gives the required information based upon a Rainfall intensity of 75mm per hour and recommendations from BS EN 12056-3:2000.
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