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7. (a) Describe, using notes and neat freehand sketches, how rainwater is collected and discharged to ground level from a pitched roof of a dwelling house, as shown in the accompanying sketch - Leaving Cert Construction Studies - Question 7 - 2009
Question 7
7. (a) Describe, using notes and neat freehand sketches, how rainwater is collected and discharged to ground level from a pitched roof of a dwelling house, as shown ... show full transcript
Worked Solution & Example Answer:7. (a) Describe, using notes and neat freehand sketches, how rainwater is collected and discharged to ground level from a pitched roof of a dwelling house, as shown in the accompanying sketch - Leaving Cert Construction Studies - Question 7 - 2009
Step 1
Describe, using notes and neat freehand sketches, how rainwater is collected and discharged to ground level from a pitched roof of a dwelling house.
Answer
Rainwater collection starts at the sloped roof where rainwater falls into the eave gutter. The eave gutter, typically 125 mm wide, collects the water and prevents it from flowing over the edges of the roof.
To ensure water flows effectively, brackets hold the eave gutter in place, mostly spaced at 125 mm apart. The assembled system will include offset bends (usually 65 mm) to guide water as it transitions downwards.
The collected water then flows through the downpipe (65 mm) which channels the water down to the base, where it discharges into a gully trap or backend gully. The gully trap (also 65 mm) collects the water and forces it into an underground piping system (100 mm) leading to a sump or soak area for proper drainage.
Step 2
Suggest two suitable uses for the stored rainwater.
Answer
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Watering vegetable gardens – utilizing rainwater for irrigation is beneficial as it is chemical-free and ideal for growing plants without the risk of chlorine exposure.
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Washing vehicles and outdoor cleaning – rainwater can be effectively used for washing vehicles and cleaning outdoor surfaces, which not only conserves treated water but also reduces expenses on water bills. Additionally, using rainwater in industrial processes can further minimize water costs.