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Table 3

Calibrated parameters of HEC-HMS rainfall–runoff model

ParameterFlood hydrograph (2007/12/13)Flood hydrograph (2008/1/3)Flood hydrograph (2009/3/18)Flood hydrograph (2010/1/5)Flood hydrograph (2011/3/12)Geometric mean
Base flow to peak discharge of flood ratio 0.19 0.37 0.44 0.13 0.17 0.23 
Base flow recession constant 0.71 0.48 0.47 0.21 0.45 0.43 
CN 70.23 72.9 70.83 70.12 70.32 70.87 
Initial abstraction (Ia) (mm) 16.49 13.24 13.52 9.81 12.2 12.87 
K (hr) of Muskingum 0.39 0.11 0.1 0.66 0.1 0.2 
X of Muskingum 0.19 0.4 0.2 0.47 0.1 0.23 
Lag time (min) 121.11 120.76 90.1 120.34 94.65 108.46 
ParameterFlood hydrograph (2007/12/13)Flood hydrograph (2008/1/3)Flood hydrograph (2009/3/18)Flood hydrograph (2010/1/5)Flood hydrograph (2011/3/12)Geometric mean
Base flow to peak discharge of flood ratio 0.19 0.37 0.44 0.13 0.17 0.23 
Base flow recession constant 0.71 0.48 0.47 0.21 0.45 0.43 
CN 70.23 72.9 70.83 70.12 70.32 70.87 
Initial abstraction (Ia) (mm) 16.49 13.24 13.52 9.81 12.2 12.87 
K (hr) of Muskingum 0.39 0.11 0.1 0.66 0.1 0.2 
X of Muskingum 0.19 0.4 0.2 0.47 0.1 0.23 
Lag time (min) 121.11 120.76 90.1 120.34 94.65 108.46 
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