A Novel Approach to Supply the Water Reservoir Demand Based on a Hybrid Whale Optimization Algorithm

Table 5

Comparing the different models of supplying demand for water on the basis of statistical indicators.

Index	Nonlinear programming	Differential evolution	Whale optimization	Improved whale optimization
Correlation coefficient	0.96	0.53	0.61	0.94
Root-mean-square error (m^3)	1.83 × 10^6	2.64 × 10^6	1.99 × 10^6	0.72 × 10^6
Mean absolute error	1.718 × 10^6	2.04 × 10^6	1.223 × 10^6	0.186 × 10^6