Inputs
Roof gutter and downpipe sizing to BS EN 12056-3 for eaves gutters.
Project Information
Method: Effective area A_e = A × (1 + 0.5·tan α), plan + half elevation per BS EN 12056-3 (α capped at 70°). Q_L = A_e × r × cat_factor / 3600 (L/s). Gutter size from BS EN 12056-3 Table 7; downpipe count from Table 8.
Results
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