Rainwater Systems revision notes
Gutters and downpipes, sizing for rainfall and safe surface-water discharge.
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C&G Unit 208: Guttering, Downpipes & Surface Drainage
Rainwater (surface water) system components
The gutter, outlet, downpipe and drainage parts that collect roof water and take it safely away.
Rainwater system design: gutter types, falls, and bracket support spacing
Sizing gutters by roof area, setting falls, and bracket spacing intervals under BS EN 12056.
Rainwater Harvesting
Rainwater sizing principles: roof area and capacity
Effective area of a pitched roof (worked example)
A worked example of finding the effective plan area a pitched roof presents for rainwater run-off.
Rainwater design flow from roof area (worked example)
Combining rainfall intensity and effective roof area to get a design flow rate in litres per second.
Greywater Reuse
C&G Unit 208: Rainwater Components & Materials
Use the roof and discharge route to read the question
Identify the roof area being drained, where water collects and the intended discharge route. Rainwater revision combines component recognition with sizing, support and maintenance reasoning. An overflow symptom should prompt you to examine the arrangement and evidence before selecting a cause.
Compare the rainwater notes with drainage and sanitation revision to keep surface-water and foul-water tasks distinct. Use the wider plumbing revision plan to check which systems your course expects you to understand.
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