## 4 Results
### Hydrology
#### 4.1.2 Annual Discharges  
The changes in the annual discharge (minimum, mean, and maximum annual flow) were evaluated by calculating the difference (as a percentage) between the pre- and post-dam periods (see Figure 7). The Kolmogorov-Smirnov and Mann-Whitney non-parametric tests were also applied to test the hypothesis of no difference at a 5% significance level between the distributions of the annual discharge values from the pre- and post-dam periods. The results of these tests are presented in Appendix C. The general effect of the studied dams in all areas was to increase the minimum annual discharges and decrease the maximum annual discharges. For the studied reservoirs, dam operation focuses on retaining the water excess during the wet period, decreasing the peak discharges to release it later in a controlled way during the dry period, increasing the minimum discharges for maintaining water consumption. At the same time, the medium annual discharges tend to remain constant. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \multirow{3}{*}{**Dam**} & \multirow{3}{*}{**\(\alpha\)**} & \multicolumn{6}{c}{**Coordinates**} & \multicolumn{6}{c}{**Characteristics**} \\ \cline{3-10}  & & \multicolumn{3}{c}{**Initial**} & \multicolumn{3}{c}{**Ending**} & \multirow{3}{*}{**\(\alpha\)**} & \multirow{3}{*}{**\(\alpha\)**} \\ \cline{3-10}  & & & & & & & & & & \\ \cline{3-10}  & & \multirow{3}{*}{**\(\alpha\)**} & \multirow{3}{*}{**\(\alpha\)**} & \multirow{3}{*}{**\(\alpha\)**} & \multirow{3}{*}{**\(\alpha\)**} & \multirow{3}{*}{**\(\alpha\)**} & \multirow{3}{*}{**\(\alpha\)**} & \multirow{3}{*}{**\(\alpha\)**} \\ \cline{3-10}  & & & & & & & & & & \\ \hline \multicolumn{10}{c}{Verde River} \\ \multirow{5}{*}{**Dam**} & \multirow{5}{*}{1} & \multirow{5}{*}{7.85} & \multirow{5}{*}{76.29} & \multirow{5}{*}{7.83} & \multirow{5}{*}{76.13} & \multirow{5}{*}{8} & Pre & 81 & 1.3 \\  & & & & & & & & & \\ \cline{3-10}  & & \multirow{3}{*}{2} & \multirow{3}{*}{7.83} & \multirow{3}{*}{76.13} & \multirow{3}{*}{7.80} & \multirow{3}{*}{76.33} & \multirow{3}{*}{5} & Pre & 60 & 1.0 \\  & & & & & & & & & \\ \cline{3-10}  & & \multirow{3}{*}{1} & \multirow{3}{*}{7.84} & \multirow{3}{*}{76.29} & \multirow{3}{*}{7.83} & \multirow{3}{*}{76.25} & \multirow{3}{*}{6.7} & Pre & 56 & 1.2 \\  & & & & & & & & & \\ \cline{3-10}  & & \multirow{3}{*}{2} & \multirow{3}{*}{7.83} & \multirow{3}{*}{76.25} & \multirow{3}{*}{7.79} & \multirow{3}{*}{76.24} & \multirow{3}{*}{6.3} & Pre & 55 & 1.0 \\  & & & & & & & & & \\ \hline \multicolumn{10}{c}{Cauca River} \\ \multirow{5}{*}{**Dam**} & \multirow{5}{*}{1} & \multirow{5}{*}{2.77} & \multirow{5}{*}{76.71} & \multirow{5}{*}{2.75} & \multirow{5}{*}{76.70} & \multirow{5}{*}{2.7} & Pre & 33 & 1.06 \\  & & & & & & & & & \\ \cline{3-10}  & & \multirow{3}{*}{2} & \multirow{3}{*}{2.75} & \multirow{3}{*}{76.70} & \multirow{3}{*}{2.71} & \multirow{3}{*}{76.74} & \multirow{3}{*}{5} & Pre & 44 & 1.15 \\  & & & & & & & & & \\ \hline \multicolumn{10}{c}{Yaguará River} \\ \multirow{5}{*}{**Dam**} & \multirow{5}{*}{1} & \multirow{5}{*}{2.69} & \multirow{5}{*}{75.51} & \multirow{5}{*}{2.64} & \multirow{5}{*}{75.52} & \multirow{5}{*}{2.5} & Pre & 71 & 1.1 \\  & & & & & & & & & \\ \cline{3-10}  & & \multirow{3}{*}{2} & \multirow{3}{*}{2.64} & \multirow{3}{*}{75.52} & \multirow{3}{*}{2.63} & \multirow{3}{*}{75.5} & Pre & 269 & 1.1 \\  & & & & & & & & & \\ \cline{3-10}  & & & & & & & & & & \\ \cline{3-10}  & & \multirow{3}{*}{1} & \multirow{3}{*}{2.56} & \multirow{3}{*}{75.49} & \multirow{3}{*}{2.53} & \multirow{3}{*}{75.5} & Pre & 342 & 1.1 \\  & & & & & & & & & & \\ \cline{3-10}  & & & & & & & & & & \\ \cline{3-10}  & & \multirow{3}{*}{2} & \multirow{3}{*}{2.53} & \multirow{3}{*}{75.5} & \multirow{3}{*}{2.47} & \multirow{3}{*}{75.56} & Pre & 122 & 1.3 \\ \cline{3-10}  & & & & & & & & & & \\ \hline \multicolumn{10}{c}{Note: Lat. latitude; Lon.: longitude; L: length; W: river width average; S: river sinusioy average; pre: pre-dam; pos: post-dam.} \\ \end{tabular}
\end{table}