The question about the water gap confused me a little bit since I didn't know that term. After looking at the pictures I managed to figure out what it was and know how it was formed and such.
The topography map seemed hard, but my partner was doing that part, so I didn't really know how it was.
The averaging of the flood values wasn't hard, but particularly time-consuming, since I had to borrow a calculator and I kept on missing decimal points or adding signs when I plugged the value in. Probably wasted 10 minutes on that.
This test wasn't particularly hard as long as you knew the material. It was straightforward; the main challenge was the length. Despite not looking at our notes except for getting the equations to use, we barely finished the test (minus the page that we dropped on the ground).
I also liked how the test used real-world data instead of just theoretical problems.
1st Fermi (2013), 2nd Astro (2014), 3rd DP (2014), 4th DP (2012)