## 3 Results
### Canadian Water Quality Index (CWQI)
#### 3.2.4 Water Quality for Agriculture  
CWQI values for irrigation were good (93) at Profile C1 at a depth 50 cm, (94) at profiles A1 and B1 at a depth of 50 cm and Profile B1 at a depth of 450 cm, and excellent  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**Profile** & **A1** & **A1** & **A1** & **A1** & **A1** & **A1** & **A1** & **B1** & **B1** & **B1** & **B1** & **B1** & **C1** \\ \hline Depth (cm) & 50 & 200 & 350 & 500 & 800 & 1000 & 1200 & 50 & 200 & 350 & 400 & 450 & 50 \\ \hline Dissolved Oxygen (mg/L) & 8.71 & 9.65 & 10.14 & 9.90 & 9.79 & 9.87 & 9.81 & 8.55 & 9.24 & 9.98 & 9.87 & 9.80 & 8.77 \\ \hline Al (mg/L) & 0.288 & - & - & - & - & - & - & 0.235 & - & - & 0.292 & 0.233 \\ \hline Hg (\(\mu\)g/L) & 0.07 & - & - & - & - & - & - & 0.07 & - & - & 0.07 & 0.07 \\ \hline Cr (mg/L) & 0.0084 & - & - & - & - & - & - & 0.0054 & - & - & 0.0074 & 0.0196 \\ \hline Cu (mg/L) & 0.0064 & - & - & - & - & - & - & 0.0052 & - & - & 0.0086 & 0.0179 \\ \hline Mn (mg/L) & 0.011 & - & - & - & - & - & - & 0.010 & - & - & 0.013 & 0.022 \\ \hline Fe (mg/L) & 0.504 & - & - & - & - & - & - & 0.390 & - & - & 0.634 & 0.374 \\ \hline \hline \end{tabular} Note: Missing data (\(\cdot\)) denotes parameters that were not measured during the specified period.  
\end{table}
Table 10: CWQI parameters by sampling depths—Ribrica Reservoir (2022).  
Figure 4: Water quality for aquatic life.  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**Profile** & **A1** & **A1** & **A1** & **A1** & **A1** & **A1** & **B1** & **B1** & **B1** & **B1** & **B1** & **C1** \\ \hline Depth (cm) & 50 & 200 & 350 & 500 & 800 & 1000 & 1200 & 50 & 200 & 350 & 400 & 450 & 50 \\ \hline Dissolved Oxygen (mg/L) & 8.335 & 8.585 & 8.785 & 8.120 & 8.135 & 8.350 & 7.905 & 8.470 & 8.745 & 8.780 & 7.970 & 6.995 & 8.735 \\ \hline Al (mg/L) & 0.218 & - & - & 0.438 & - & - & - & 0.186 & - & 0.094 & - & 0.426 & 0.180 \\ \hline Hg (\(\mu\)g/L) & 0.07 & - & - & 0.07 & - & - & - & - & 0.07 & - & 0.07 & - & 0.07 & 0.07 \\ \hline Cr (mg/L) & 0.0031 & - & - & 0.0005 & - & - & - & 0.0022 & - & 0.0037 & - & 0.0017 & 0.0028 \\ \hline Cu (mg/L) & 0.0024 & - & - & 0.0039 & - & - & - & 0.0021 & - & 0.0019 & - & 0.0067 & 0.002 \\ \hline Mn (mg/L) & 0.059 & - & - & 0.049 & - & - & - & 0.037 & - & 0.010 & - & 0.048 & 0.004 \\ \hline Fe (mg/L) & 0.304 & - & - & - & - & - & - & 0.318 & - & 0.287 & - & 0.249 & 0.306 \\ \hline \hline \end{tabular} Note: Missing data (\(\cdot\)) denotes parameters that were not measured during the specified period.  
\end{table}
Table 9: CWQI parameters by sampling depths—Ribrica Reservoir (annual averages, 2021).  
(100) at profile B1 at a depth of 350 cm and Profile A1 at a depth of 500 cm. There were no data for other depths. A slight decline in CWQI values was caused by increased Cr concentrations with the highest _nse_ (Figure 5).  
CWQI values for livestock were marginal (62) at a depth of 50 cm at all profiles, (63) at Profile B1 at a depth of 450 cm, fair (66) at Profile B1 at a depth of 350 cm and Profile A1 at a depth of 500 cm, and excellent (100) at all other depths. Marginal and fair water quality was the result of increased Hg concentrations with the highest _nse_ (Figure 6).