Rainwater drainage is the provision or route carrying rainwater away from a roof. In conversation, it may mean a roof outlet, downpipe or larger connected system. Ask which component and work boundary the term refers to in the particular proposal.
The connection to the roof covering and continuation of pipework may raise different investigation questions. A photograph of the visible opening does not fully describe the concealed route. Identify unknown pipe sections as uncertainties rather than inferring their condition from appearance.
This explanation calculates neither capacity nor the required number of outlets. Actual geometry and technical starting points need appropriate assessment. Record which components were examined or treated and which part of the route remains outside the instruction in the roof dossier.
Worth asking
Frequently asked questions
Does rainwater drainage always mean only the downpipe?
No. It can describe a wider route. Have the intended scope clarified.
Can surface area alone establish capacity?
This website makes no such calculation. Relevant starting points require professional assessment.