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An extension to the side of a dwelling house has a lean-to roof, as shown in the accompanying sketch - Leaving Cert Construction Studies - Question 7 - 2010
Question 7
An extension to the side of a dwelling house has a lean-to roof, as shown in the accompanying sketch. Also shown is an underground rainwater storage tank. (a) Using... show full transcript
Worked Solution & Example Answer:An extension to the side of a dwelling house has a lean-to roof, as shown in the accompanying sketch - Leaving Cert Construction Studies - Question 7 - 2010
Step 1
Using notes and neat freehand sketches, show how the rainwater is collected from the lean-to roof and discharged to a gulley trap at ground level. Label the components and give their typical sizes.
Answer
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Collection of Rainwater:
- The rainwater is first collected by the gutter attached to the edge of the lean-to roof. The typical size for an eaves gutter is 125 mm.
- Rainwater flows from the gutter to a downpipe, which is typically sized at 65 mm.
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Discharge to Gulley Trap:
- The rainwater then travels down the downpipe and enters a gulley trap at ground level where it is collected.
- Draw a freehand sketch showing the roof, gutter, downpipe, and gulley trap with labels for each component.
Step 2
Using notes and neat freehand sketches, show the pipework necessary to convey the rainwater from the gulley trap to the storage tank and show the location of a rainwater filter in this system.
Answer
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Underground Piping:
- Rainwater flows from the gulley trap into an underground pipe leading to the storage tank.
- Position the filter between the gulley trap and the storage tank to remove sediments.
- The typical sketch should illustrate two routes: A or B for the filter access for maintenance.
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Storage Tank Configuration:
- Show the storage tank that can overflow into a sump to manage excess water.
- Include a submersible pump inside the tank for pumping water back to the house with access for cleaning.
Step 3
Discuss two advantages of storing rainwater and give two suitable uses for the stored rainwater.
Answer
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Advantages of Storing Rainwater:
- It helps reduce domestic water consumption by utilizing rainwater for non-potable uses, thus conserving treated drinking water.
- Rainwater is less damaging to appliances, as it contains fewer detergents, improving the efficiency of washing machines.
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Uses for Stored Rainwater:
- Irrigation: Ideal for watering vegetable gardens and plants, ensuring no chlorine is introduced.
- Washing: Suitable for outdoor cleaning tasks like washing cars and driveways.