Changes

<math>

<math>

Q=\left\{\begin{matrix}

Q=

0,& Z\leq Z_{0} \\  

\left\{\begin{matrix}

C_{w}L_{w}\left ( Z-Z_{0} \right )^{1.5} & Z_{0}\leq Z\leq Z_{0}+H_{0}\\  

0, & Z\leq Z_{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_{0} \right )^{1.5}, & Z_{0}\leq Z\leq Z_{0}+H_{0}\\  

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  

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.

\end{matrix}\right.

</math>

</math>