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Table 1

Example of performance assessment of IK based on sample isotropic and anisotropic variograms and elliptic-fitted anisotropic variogram at 18:30 pm during the 2007-05-18 rainstorm event

DistributionIK based on sample isotropic variogramIK based on sample anisotropic variogramIK based on elliptic-fitted anisotropic variogramDistributionIK based on sample isotropic variogramIK based on sample anisotropic variogramIK based on elliptic-fitted anisotropic variogram
 BIAS  RMSE 
DA 1.992 −0.529 0.526 DA 15.682 6.439 8.951 
LN −0.462 −0.932 −0.526 LN 6.910 6.291 6.556 
GEV −1.282 −1.907 −1.567 GEV 9.017 6.319 6.371 
Gumbel −0.293 −1.387 −1.132 Gumbel 9.561 6.707 6.958 
GPA −0.336 −1.333 −0.928 GPA 8.847 6.296 6.403 
PA −0.198 −1.356 −1.059 PA 8.791 6.336 6.505 
GLO −1.053 −1.528 −1.199 GLO 9.037 6.325 6.345 
LO −0.343 −1.392 −1.174 LO 9.934 6.44 6.655 
 MAE  AEIV 
DA 4.926 2.577 3.468 DA 0.847 0.828 0.830 
LN 2.707 2.443 2.632 LN 0.847 0.844 0.840 
GEV 3.141 2.297 2.374 GEV 0.847 0.852 0.850 
Gumbel 3.334 2.431 2.64 Gumbel 0.818 0.837 0.825 
GPA 3.250 2.298 2.413 GPA 0.848 0.852 0.855 
PA 3.089 2.313 2.478 PA 0.843 0.851 0.849 
GLO 3.063 2.297 2.348 GLO 0.848 0.851 0.850 
LO 3.307 2.363 2.542 LO 0.821 0.845 0.834 
DistributionIK based on sample isotropic variogramIK based on sample anisotropic variogramIK based on elliptic-fitted anisotropic variogramDistributionIK based on sample isotropic variogramIK based on sample anisotropic variogramIK based on elliptic-fitted anisotropic variogram
 BIAS  RMSE 
DA 1.992 −0.529 0.526 DA 15.682 6.439 8.951 
LN −0.462 −0.932 −0.526 LN 6.910 6.291 6.556 
GEV −1.282 −1.907 −1.567 GEV 9.017 6.319 6.371 
Gumbel −0.293 −1.387 −1.132 Gumbel 9.561 6.707 6.958 
GPA −0.336 −1.333 −0.928 GPA 8.847 6.296 6.403 
PA −0.198 −1.356 −1.059 PA 8.791 6.336 6.505 
GLO −1.053 −1.528 −1.199 GLO 9.037 6.325 6.345 
LO −0.343 −1.392 −1.174 LO 9.934 6.44 6.655 
 MAE  AEIV 
DA 4.926 2.577 3.468 DA 0.847 0.828 0.830 
LN 2.707 2.443 2.632 LN 0.847 0.844 0.840 
GEV 3.141 2.297 2.374 GEV 0.847 0.852 0.850 
Gumbel 3.334 2.431 2.64 Gumbel 0.818 0.837 0.825 
GPA 3.250 2.298 2.413 GPA 0.848 0.852 0.855 
PA 3.089 2.313 2.478 PA 0.843 0.851 0.849 
GLO 3.063 2.297 2.348 GLO 0.848 0.851 0.850 
LO 3.307 2.363 2.542 LO 0.821 0.845 0.834 
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