Construction Technology: Water and Soil Management
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Questions and Answers

What is the typical spacing between wellpoints in a dewatering system?

  • 0.5 to 1 meter
  • 1.5 to 3 meters (correct)
  • 10 to 20 meters
  • 5 to 10 meters

What is the purpose of a trench drain?

  • To install wellpoints
  • To collect and convey surface water runoff (correct)
  • To lower the groundwater table
  • To pump water from wellpoints

What is installed at the downstream end of a trench drain?

  • An outlet or collection point (correct)
  • A pump
  • A wellpoint
  • A grate or cover

What is the benefit of using trench drains?

<p>They prevent water ingress into excavations (C)</p> Signup and view all the answers

What is the purpose of the grate or cover in a trench drain?

<p>To prevent debris and foreign objects from entering the drain (B)</p> Signup and view all the answers

What is the term for the process of creating a cone of depression around the excavation area?

<p>Drawdown (B)</p> Signup and view all the answers

What is the name of the specialized equipment used to install wellpoints?

<p>All of the above (D)</p> Signup and view all the answers

What factor affects the effectiveness of wellpoint dewatering?

<p>All of the above (D)</p> Signup and view all the answers

Which method is used for collecting and diverting surface water away from the site during excavation?

<p>Trench drains (C)</p> Signup and view all the answers

Which of the following best describes an advantage of using trench drains in excavation projects?

<p>They effectively collect and divert surface water away from the site. (B)</p> Signup and view all the answers

What materials are typically used to construct wellpoints?

<p>PVC or steel with perforations or slots (B)</p> Signup and view all the answers

In the context of dewatering, which method involves water being accumulated in sumps at the lowest point of the excavation?

<p>Sump pumping (C)</p> Signup and view all the answers

When selecting equipment for dewatering, which method is most suitable for high water table areas?

<p>Wellpoints (B)</p> Signup and view all the answers

Which dewatering method is primarily used for deeper excavations to extract water from greater depths?

<p>Deep wells (D)</p> Signup and view all the answers

How are trench drains typically installed relative to the surface grade?

<p>Flush with the surface grade or slightly below (D)</p> Signup and view all the answers

Which of the following environments would least likely require the use of trench drains?

<p>Forested hiking trails (B)</p> Signup and view all the answers

What is one of the primary materials used to construct trench drains?

<p>Polymer concrete (D)</p> Signup and view all the answers

What benefit do trench drains provide related to slip and fall hazards?

<p>They remove standing water (B)</p> Signup and view all the answers

For which application would trench drains NOT typically be used?

<p>Residential swimming pool bottoms (B)</p> Signup and view all the answers

Which factor is less relevant when selecting appropriate dewatering equipment?

<p>Color of the trench drain covers (D)</p> Signup and view all the answers

What might be a key aesthetic benefit of trench drains?

<p>Customizable decorative grates (B)</p> Signup and view all the answers

What is one of the installation steps that might occur after placing the trench drain channel?

<p>Connecting to outlet structures (B)</p> Signup and view all the answers

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