\(NSE=1-\frac{\sum_{i=1}^{n}{(Q_{sim,i}-Q_{obs,i})}^{2}}{\sum_{i=1}^{n}{(Q_{obs,i}-{\overset{\overline{}}{Q}}_{\text{obs}})}^{2}}\) (15)
\(BIAS=\frac{\sum_{i=1}^{n}{Q_{sim,i}-\sum_{i=1}^{n}Q_{obs,i}}}{\sum_{i=1}^{n}Q_{obs,i}}\) (16)