Golfer, just because it's not in the paper doesn't mean it wasn't completed as part of the overall study. Technical papers actually represent minute portions of much larger studies.
There is nothing wrong with questioning the scope of a study and the quality of the data. That is what you are supposed to do, and in fact, after reading the paper, I was left with several questions. However, were I considering using data from that paper, I would email one of the authors and ask for clarification of my questions.
So in my opinion, it's premature to criticize the authors before you know the actual scope of the study. It's bad form.
We also need the topgraphy of the lake and its watershed topography soil profiles.
I have no idea what this means. Please explain.