Effective Roof Area, (A)
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- According to BS EN 12056-3, it is the surface area of roof where in with/ without wind driven rain is considered.
Wind driven rain
- Without
Where no allowance is made for wind, the Effective Roof Area (A) shall be calculated from the equation; "A=" L_"R" ×B_"R" where A is the effective roof area, in square metres ("m" ^2 ); L_"R" is the length of roof to be drained, in metres (m); B_"R" is the width of roof from gutter to ridge, in metres (m).
- With
Where allowance is made for wind, the effective roof area shall be calculated as follows;
