## 2 Materials and Methods
### Existing Models Using Model Tree Technique of Data Mining
\) & \multicolumn{2}{c}{**Equations**} \\ \hline \multirow{4}{*}{M3} & E1 & \(\leq 0.25\) & - & - & - & \(1131.27\times h^{1.59075}\times S^{0.0981}\times V^{1.5674}\times d_{50}^{-0.438}\) \\ \cline{2-8}  & E2 & \(0.25<V\leq 0.51\) & - & - & - & \(1866.46\times h^{1.4079}\times S^{0.1057}\times V^{1.0096}\times d_{50}^{-1.911}\) \\ \cline{2-8}  & E3 & & \(\leq 2.23\) & - & - & \(152.32\times h^{0.3052}\times S^{0.2124}\times W^{0.09278}\times V^{1.3159} \times d_{50}^{-0.0166}\) \\ \cline{2-8}  & E4 & & & \(\leq 0.42\) & - & \(54100.57\times h^{0.6327}\times S^{0.2418}\times V^{1.7366}\times d_{50}^{-0.1959}\) \\ \cline{2-8}  & E5 & & \( \begin{array}{c}>2.23\end{array} \) & \( \begin{array}{c}\leq 310.44\end{array} \) & \(\begin{array}{c}22285.69\times h^{0.6723}\times S^{0.0728}\times V^{2.5323} \times d_{50}^{3106}\) \\ \cline{2-8}  & E6 & & \( \begin{array}{c}>310.44\end{array} \) & \( \begin{array}{c}18760.33\times h^{1.4827}\times S^{0.1958}\times V^{1.5023} \times d_{50}^{31.067}\end{array} \) \\ \cline{2-8}  & E7 & & - & \(\leq 278.38\) & \(4415.16\times h^{1.3998}\times S^{0.0804}\times W^{-0.1107}\times V^{1.972 2}\times d_{50}^{-0.0293}\) \\ \cline{2-8}  & E8 & \(\begin{array}{ \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Model**} & \multirow{2}{*}{**Submodel**} & \multicolumn{4}{c}{**Conditions**} & \multicolumn{2}{c}{**Equations**} \\ \cline{3-6}  & & \(V\) **(m/s)** & \(h\) **(m)** & _d_\({}_{50}\) **(mm)** & & \\ \hline \multirow{4}{*}{M6} & E1 & \(\leq 0.96\) & - & - & \(11605.1\times h^{1.6891}\times S^{0.2044}\times V^{2.0979}\times d_{50}^{-0.0166}\) \\ \cline{2-6}  & E2 & & \(\leq 2.74\) & - & \(3298.09\times h^{1.2913}\times S^{0.004}\times V^{2.1405}\times d_{50}^{-1.1727}\) \\ \cline{2-6}  & E3 & \(>0.96\) & \(>2.74\) & \(\leq 0.72\) & \(137902.2\times h^{0.286}\times S^{0.1815}\times V^{2.8344}\times d_{50}^{0.919}\) \\ \cline{2-6}  & E4 & & \(>0.72\) & \(6624.3\times h^{1.4408}\times S^{0.004}\times V^{1.2056}\times d_{50}^{-7407}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Application conditions and determination coefficients of Model 6 (M6). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Model**} & \multirow{2}{*}{**Submodel**} & \multicolumn{4}{c}{**Conditions**} & \multicolumn{2}{c}{**Equations**} \\ \cline{3-6}  & & \(V\) **(m/s)** & \(H\) **(m)** & _d_\({}_{50}\) **(mm)** & & \\ \hline \multirow{4}{*}{M6} & E1 & \(\leq 0.51\) & - & - & - & \(1535.48\times h^{1.4971}\times V^{2.0023}\times d_{50}^{-0.3761}\) \\ \cline{2-6}  & E2 & & \(\leq 2.23\) & - & - & \(36.83\times h^{0.4807}\times W^{0.9002}\times V^{3.5055}\times d_{50}^{-0.0133}\) \\ \cline{2-6}  & E3 & \(0.51<V\leq\) & \multirow{2}{*}{\(>2.23\)} & \(\leq 0.42\) & - & \(435.37\times h^{0.6409}\times W^{0.4972}\times V^{1.7106}\times d_{50}^{0.2207}\) \\ \cline{2-6}  & E4 & & \(>2.23\) & \(>0.42\) & \(\leq 310.44\) & \(12383.25\times h^{0.6574}\times V^{2.3264}\times d_{50}^{0.125}\) \\ \cline{2-6}  & E5 & & \(>0.42\) & \(>310.44\) & \(5570.83\times h^{1.3264}\times V^{1.6255}\times d_{50}^{1.25}\) \\ \cline{2-6}  & E6 & & - & - & \(\leq 278.38\) & \(4272.69\times h^{1.4001}\times V^{0.1107}\times V^{1.9732}\times d_{50}^{-0.0269}\) \\ \cline{2-6}  & E7 & \(>0.96\) & - & \(\leq 0.66\) & \(>278.38\) & \(19.67\times h^{0.2361}\times W^{1.3354}\times V^{2.6623}\times d_{50}^{1.2808}\) \\ \cline{2-6}  & E8 & & - & \(>0.66\) & \(1.17\times h^{1.1204}\times W^{1.5448}\times V^{1.3161}\times d_{50}^{-0.5337}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Application conditions and determination coefficients of Model 7 (M7).