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Unknown macro: {latex}
\large
$$
Q = {{ - \pi } \over {\sqrt 2 }}D^
Unknown macro: {5/2}
\sqrt {gh_{\rm{f } \over L}} \log \left( \varepsilon \over {3.7D + 2.51\nu \sqrt L \over {2gh_{\rm{f D^3 }}} } \right)
$$