I have this code:
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\documentclass[a4paper, draft]{amsart}
\usepackage{nag}
\usepackage{siunitx}
\begin{document}
\begin{align*}
q_{x} &= -K_{x,\text{avg}}\frac{\Delta{h}}{\Delta{x}} \\
&= -\frac{K_{x,A}+K_{x,C}}{2}\frac{\Delta{h}}{\Delta{x}} \\
% &= -\frac{\SI{0.35}{\metre\per\day}+\SI{0.25}{\metre\per\day}}{2}\frac{\SI{44.50}{\metre}-\SI{44.62}{\metre}}{\SI{100}{\metre}} \\
% &= \SI{-0.30}{\metre\per\day}\frac{\SI{-0.12}{\metre}}{\SI{100}{\metre}} \\
% &= \SI{3.6e-4}{\metre\per\day}
\end{align*}
Assuming this specific discharge applies over the full saturated height of the upper sand, estimate the rate of groundwater seepage [\si{\cubic\liter}/T] from the upper sand to the stream, per meter of stream (a strip \SI{1}{\metre} thick in the $y$ direction into the page).
\end{document}
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! Missing number, treated as zero.
<to be read again>
\egroup
l.14 \end{align*}
^^M
?
