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1. They can't fall in on themselves as squares can by going diagonal. 2. Circles provide more area for less material than squares so it is economical. 3. The manhole is likely cylindrical due to the cost effectiveness of the volume vs material ratio. 4. If the cover becomes un-level over time a corner will not be sticking up as may happen with a square manhole cover. 5. Ummmm.... Aesthetics? Looks nicer than square ones? Less

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I discussed salary preferences.

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Normal answer for these types of questions.

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This, in my opinion, mattered the least and was not surprisingly very easy. Make sure you communicate with your group and vocalize your thought process. Note: Although difficult, try to make sure you let your personality shine throughout the entire interview process, this will only help you stand out. Even though its government its still just people hiring people. Less

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Again keep a good "story" pool and make sure to answer the question in the S.T.A.R. format. you will likely have a briefing you've prepared before proceeding with the interview. DO bring relevant information to show to the interviewer and make sure you research the hell out of your topic you will have to convince them of whatever case you are making. Less

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Either edge detection (Laplacian), look at the variance, or FFT of image, look at high vs low frequency Less

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I mentioned my experience with orthorectification and creating DEMs.

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I just said what I know based on my research for the position I am applying for

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Keep open communication of progress and coordinate in advance to work together with coworkers informing them of the situation to meet the deadline and not impact the business. Less