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Table 5 shows the evaluation criteria of the estimated outflow hydrographs by the LMM-L and VEP-NLMM-L. Similarly to Case 1, the VEP-NLMM-L still produces more accurate routing outflows in terms of all criteria than the LMM-L and the accuracy increases with the number of inflow dividing levels L. All models can estimate the peak outflow on the correct time interval (DPOT = 0). The VEP-NLMM-L with L = 4 also gives the closest peak outflow to the observed value.

Table 5

Evaluation criteria of estimated outflows for River Wyre flood, October 1982

ModelDPODPOTηMAREMAE
LMM-L (O'Donnell 1985) 1.10 98.39 0.101 3.231 
VEP-NLMM-L (this study) L = 1 1.88 99.81 0.030 0.950 
L = 2 0.29 99.90 0.024 0.665 
L = 3 0.17 99.91 0.025 0.689 
L = 4 0.07 99.93 0.023 0.662 
L = 5 0.16 99.94 0.021 0.624 
ModelDPODPOTηMAREMAE
LMM-L (O'Donnell 1985) 1.10 98.39 0.101 3.231 
VEP-NLMM-L (this study) L = 1 1.88 99.81 0.030 0.950 
L = 2 0.29 99.90 0.024 0.665 
L = 3 0.17 99.91 0.025 0.689 
L = 4 0.07 99.93 0.023 0.662 
L = 5 0.16 99.94 0.021 0.624 

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