Intern Engineering Designer, Water
Posted Oct 1, 2026 · We last checked this listing on Oct 6, 2026
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Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about a class or project where you had to do engineering calculations and check them.
What they are checking: Care with calculations, since errors in design numbers carry through to reports, cost estimates and construction.
Tell me about a time you worked on a team project with a tight deadline.
What they are checking: How they share work and communicate when project deliverables are due.
Why are you interested in water and wastewater engineering?
What they are checking: Real interest in the water sector and its public impact, which signals whether they will grow in the field.
What would you do
A senior engineer marks up your drawing with a lot of red comments. How do you respond?
What they are checking: Coachability and attention to detail when revising work for experienced engineers.
You are unsure what a specification section means and your mentor is out today. What do you do?
What they are checking: Resourcefulness balanced with knowing when to ask rather than guess on engineering work.
About the work
What experience do you have with AutoCAD Civil 3D, and have you ever drawn a plan and profile?
What they are checking: Whether they can start producing drawings quickly, since plan and profile sheets are core work for this internship.
How would you size a storm sewer pipe for a small drainage area? Walk me through the basic steps.
What they are checking: Grasp of the Rational Method and Manning's equation, which drive everyday storm sewer design.
What is the difference between how you design a sanitary sewer and a watermain?
What they are checking: Understanding gravity flow and minimum velocities versus pressure systems, fire flow and looping.
How would you start putting together a cost estimate for a watermain replacement?
What they are checking: Basic sense of quantities, unit costs and contingencies used in preliminary engineering.
What do you know about the permits a water or wastewater project might need?
What they are checking: Awareness that state agencies and local approvals shape design and schedule on public water projects.
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As published by T.Y. Lin International.