# Integrated Assessment of Surface Water Quality in Danube River Chilia Branch
## 3 Results and Discussion
The obtained values are presented in Table 6.  
Water quality from Ceatal Chilia (2013, 2017, 2018, 2019), Izmail Downstream (2018), Periprava (2017, 2019), Bastroe Upstream (2013, 2017, 2019), and Bastroe Downstream (2013, 2017, 2019) is ranked in the excellent quality class, meaning that the surface waters in the mentioned years have conditions very close to natural or pristine levels, assuring \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Parameter**} & \multirow{2}{*}{**Sampling**} & \multicolumn{8}{c}{**Values**} \\ \cline{3-10}  & & **No. of Samples** & **Min.** & **Max.** & **Median** & **Mean** & **Std. Dev.** & **Skewness** & **Kurtosis** \\ \hline \multirow{4}{*}{N-NH\({}_{4}\)\({}^{*}\)} & CC & 26 & 0.000 & 0.218 & 0.104 & 0.111 & 0.060 & 0.183 & \(-\)0.944 \\  & ID & 21 & 0.040 & 0.333 & 0.133 & 0.140 & 0.073 & 0.654 & 0.134 \\  & P & 25 & 0.024 & 0.294 & 0.156 & 0.157 & 0.068 & 0.127 & \(-\)0.428 \\  & BU & 17 & 0.038 & 0.227 & 0.141 & 0.137 & 0.058 & \(-\)0.111 & \(-\)0.974 \\  & BD & 17 & 0.045 & 0.279 & 0.180 & 0.169 & 0.060 & \(-\)0.603 & \(-\)0.132 \\ \hline \multirow{4}{*}{N-NO\({}_{2}\)\({}^{-}\)} & CC & 26 & 0.008 & 0.054 & 0.018 & 0.020 & 0.010 & 1.594 & 2.709 \\  & ID & 21 & 0.008 & 0.037 & 0.018 & 0.020 & 0.008 & 0.945 & \(-\)0.059 \\  & P & 25 & 0.009 & 0.122 & 0.020 & 0.026 & 0.023 & 3.077 & 9.609 \\  & BU & 17 & 0.005 & 0.041 & 0.016 & 0.018 & 0.008 & 1.250 & 1.991 \\  & BD & 17 & 0.009 & 0.039 & 0.017 & 0.018 & 0.007 & 1.501 & 1.929 \\ \hline \multirow{4}{*}{N-NO\({}_{3}\)\({}^{-}\)} & CC & 26 & 0.406 & 9.744 & 1.072 & 1.461 & 1.725 & 4.239 & 17.485 \\  & ID & 21 & 0.008 & 2.260 & 1.101 & 1.106 & 0.585 & 0.135 & \(-\)0.268 \\  & P & 25 & 0.377 & 5.133 & 1.071 & 1.302 & 0.932 & 2.764 & 8.657 \\  & BU & 17 & 0.090 & 2.276 & 1.113 & 1.137 & 0.549 & 0.347 & \(-\)0.068 \\  & BD & 17 & 0.403 & 2.436 & 1.010 & 1.185 & 0.580 & 0.943 & \(-\)0.213 \\ \hline \multirow{4}{*}{TN} & CC & 26 & 1.395 & 18.054 & 3.892 & 4.962 & 3.680 & 2.365 & 5.227 \\  & ID & 21 & 0.979 & 10.399 & 4.125 & 4.866 & 2.390 & 0.675 & \(-\)0.279 \\  & P & 25 & 1.732 & 31.857 & 6.095 & 7.302 & 6.110 & 2.503 & 7.642 \\  & BU & 17 & 2.138 & 13.956 & 5.111 & 6.254 & 3.767 & 0.863 & \(-\)0.623 \\  & BD & 17 & 1.935 & 13.735 & 6.688 & 6.731 & 3.305 & 0.579 & \(-\)0.281 \\ \hline \multirow{4}{*}{P-PO\({}_{4}\)\({}^{-3}\)} & CC & 26 & 0.003 & 0.118 & 0.050 & 0.050 & 0.021 & 0.498 & 3.032 \\  & ID & 21 & 0.007 & 0.108 & 0.050 & 0.051 & 0.021 & 0.516 & 1.050 \\ \cline{1-1}  & P & 25 & 0.001 & 0.080 & 0.051 & 0.049 & 0.016 & \(-\)0.877 & 1.591 \\ \cline{1-1}  & BU & 17 & 0.035 & 0.096 & 0.048 & 0.053 & 0.015 & 1.236 & 1.508 \\ \cline{1-1}  & BD & 17 & 0.031 & 0.067 & 0.045 & 0.048 & 0.010 & 0.285 & \(-\)0.825 \\ \hline \multirow{4}{*}{TP} & CC & 26 & 0.067 & 0.243 & 0.118 & 0.123 & 0.042 & 1.524 & 2.449 \\ \cline{1-1}  & ID & 21 & 0.045 & 0.192 & 0.108 & 0.114 & 0.038 & 0.424 & \(-\)0.530 \\ \cline{1-1}  & P & 25 & 0.043 & 0.205 & 0.106 & 0.113 & 0.038 & 0.588 & 0.037 \\ \cline{1-1}  & BU & 17 & 0.052 & 0.197 & 0.110 & 0.111 & 0.046 & 0.480 & \(-\)1.005 \\ \cline{1-1}  & BD & 17 & 0.050 & 0.217 & 0.122 & 0.122 & 0.051 & 0.315 & \(-\)0.878 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Statistical parameters for the Chilia branch ecological status evaluation (2013-2019). the absence of threat for the Danube River ecological system and human health [22,36] (Table 6). In the good quality class are the surface waters from Coastal Chilia (2016), Izmail Downstream (2013, 2014, 2015, 2016, 2019), Periprava (2015, 2016, 2018), Bastroe Upstream (2015, 2016), and Bastroe Downstream (2015, 2016, 2018). The results show that the water quality class is protected with only a minor degree of threat or impairment; conditions rarely depart from natural or desirable levels [22].