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Table 7

Calibrated parameters used in the HEC–HMS model for different sub-basins

ParameterQarasouGamasiabSeimareh
Max canopy storage (mm) 1.3 1.3 1.2 
Max surface storage (mm) 4.8 4.5 
Max infiltration (mm/hr) 11 10 10 
Impervious (%) 14 14 14 
Soil storage (mm) 115 115 115 
Tension storage (mm) 18 17.5 17.5 
Soil percolation (mm/hr) 4.5 3.75 
GW1 storage (mm) 85 85 85 
GW1 percolation (mm/hr) 3.5 
GW1 coefficient (hr) 400 400 400 
GW2 storage (mm) 95 95 95 
GW2 percolation (mm/hr) 0.08 0.05 0.04 
GW2 coefficient (hr) 600 600 600 
Time of concentration (hr) 25.5 28 35 
Storage coefficient (hr) 53.5 74.5 85 
Recession constant 0.98 0.98 0.99 
ParameterQarasouGamasiabSeimareh
Max canopy storage (mm) 1.3 1.3 1.2 
Max surface storage (mm) 4.8 4.5 
Max infiltration (mm/hr) 11 10 10 
Impervious (%) 14 14 14 
Soil storage (mm) 115 115 115 
Tension storage (mm) 18 17.5 17.5 
Soil percolation (mm/hr) 4.5 3.75 
GW1 storage (mm) 85 85 85 
GW1 percolation (mm/hr) 3.5 
GW1 coefficient (hr) 400 400 400 
GW2 storage (mm) 95 95 95 
GW2 percolation (mm/hr) 0.08 0.05 0.04 
GW2 coefficient (hr) 600 600 600 
Time of concentration (hr) 25.5 28 35 
Storage coefficient (hr) 53.5 74.5 85 
Recession constant 0.98 0.98 0.99 
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