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[[File:Riser.gif|thumb|A two stage riser with low flow controlled with an orifice and high flow controlled with a weir.]]
[[File:Riser.gif|thumb|A two stage riser with low flow controlled with an orifice and high flow controlled with a weir.]]
<math>
Q=
\left\{\begin{matrix}
0, & Z\leq Z_{0} \\
C_{w}L_{w}\left ( Z-Z_{0} \right )^{1.5}, & Z_{0}\leq Z\leq Z_{0}+H_{0}\\
C_{d}A_{0}\sqrt{2g\left (Z-Z_{0}-0.5H_{0}\right)}, & Z_{0}+H_{0}\leq Z\leq Z_{1}\\
C_{w}L_{w}\left ( Z-Z_{1} \right )^{1.5}+C_{d}A_{0}\sqrt{2g\left (Z-Z_{1}\right)}, & Z_{1}<Z
\end{matrix}\right.
</math>