Groundworker Part B

A combined drainage system discharges the following

• Foul water from sinks, baths toilets only

• Surface water from yard gullies only

• Foul water from sink, baths, toilets, yard gullies and paved areas

• Soakaways only

Which of the following is NOT typically included in a combined drainage system?

• Rainwater from roofs

• Surface water from paved areas

• Industrial effluents

• Wastewater from kitchens

What is the main advantage of a combined drainage system?

• It requires less maintenance

• It allows both foul and surface water to be carried in a single pipe

• It separates foul and surface water

• It prevents flooding during heavy rain

In a combined drainage system, which of the following sources contributes to the flow during a storm?

• Only industrial waste

• Both foul water and surface water

• Only surface water from roads

• Only foul water from toilets

Why are geotextiles typically used?

• They increase strength

• They are impermeable

• They are degradable

• They are eco-friendly

Which of the following best describes a combined drainage system?

• It carries only rainwater from roofs

• It transports both sewage and stormwater in the same pipe

• It uses separate pipes for foul and surface water

• It separates industrial effluents from domestic wastewater

Which component is commonly found in both combined and separate drainage systems?

• Rainwater harvesting tanks

• Industrial effluent tanks

• Soakaways only

• Manholes

Which of the following would provide an impermeable barrier for water retention?

• Geotextiles

• Geomatrices

• Geogrids

• Geomembranes

What is the strongest method of joining geomembrane sheets together?

• Sewing

• Tacking

• Bonding

• Stapling

Which of the following is a primary function of manholes in drainage systems?

• To separate foul and surface water

• To store rainwater

• To provide access for inspection and maintenance

• To filter wastewater