This is the question I am working on: enter image description here

And here is part of the working i don't understand: enter image description here

I don't understand the process of plotting the profile - the little crosses marked on the diagram, how do you determine those? It says "plot sequent depths from jump equation taking d1 from upstream profile". So I used d1 = 1.2m and solved for d2 using the equation $d_2=\frac{d_1}{2}\times(\sqrt{1+\frac{8q^2}{g{d_1}^3}}-1)$ and obtained $d_2=4.24m$ (I used q = 11.64 from previous calculations) What exactly is that telling me though, am i even on the right track?


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