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(a) Discuss three considerations to ensure the proper treatment and disposal of sewage when selecting a site for a house in a rural location - Leaving Cert Construction Studies - Question 8 - 2019
Question 8
(a) Discuss three considerations to ensure the proper treatment and disposal of sewage when selecting a site for a house in a rural location. (b) The drawing shows ... show full transcript
Worked Solution & Example Answer:(a) Discuss three considerations to ensure the proper treatment and disposal of sewage when selecting a site for a house in a rural location - Leaving Cert Construction Studies - Question 8 - 2019
Step 1
Discuss three considerations to ensure the proper treatment and disposal of sewage when selecting a site for a house in a rural location.
Answer
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Soil Type: The soil present on the site is crucial as it influences the effectiveness of percolation. Sandy soils allow for better drainage while clay soils can impede it.
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Water Table: Understanding the water table level is important. A high water table can lead to contamination issues as it may interfere with the percolation process.
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Proximity to Other Structures: The distance between the house and neighboring buildings, roads, or water sources must be considered to prevent potential contamination and to ensure adequate treatment of wastewater.
Step 2
Using notes and freehand sketches, show the design layout necessary for a typical wastewater treatment system and percolation area on this site.
Answer
The design layout should include the following key features:
- Septic Tank: Diameter of 100-110 mm with a minimum distance of 7 m from the dwelling.
- Percolation Trenches: Length of 18 m and a minimum separation of 2 m between trenches.
- System Boundaries: Ensure a minimum distance of 3 m from the system to property boundaries, and at least 4 m to any road. Sketches should visually represent these components with the relevant dimensions.
Step 3
Using notes and freehand sketches, discuss an alternative method, other than a typical percolation area to ensure the safe treatment of wastewater from a dwelling house.
Answer
One alternative method is the use of Constructed Wetlands for wastewater treatment. This involves using both horizontal and vertical flow systems which mimic the natural purification processes found in wetlands.
Another method is Peat Filter Systems which consist of a septic tank that distributes wastewater onto a peat filter that further treats the effluent before it reaches the drain field. Both options can effectively manage wastewater treatment while promoting positive environmental impacts.