Estimated values of parameters used in the HEC-HMS model
| Parameter . | Value . | Source . |
|---|---|---|
| Sediment grain size distribution | 0.077–0.50 (d50: 0.15) | Consistent with Coleman (1969) |
| Manning's roughness coefficient | 0.018, 0.025, 0.035 | Jung et al. (2010) |
| Effective river width | 300–10,000 m | Goswami (1985) and Coleman (1969) |
| Length | 184.7–200,000 m | Estimated from GIS and Google Earth |
| Slope | 0.000079–0.0168 m/m | Mahanta et al. (2014) |
| Manning's n | 0.025–0.04 | Jung et al. (2010) |
| Surface storage | 6.85–50.8 mm | Bennett (1988) |
| Maximum infiltration rate | 12.6–137.1 mm/h | Rawls et al. (1982) |
| Erodibility factor | 0.05–0.086 | Soil map |
| Practice factor | 1 | Scharffenberg (2015) |
| Topographic factor | 0.3–1.9 | Slope and length |
| Cover and management factor | 0.0001–0.44 | Land use map |
| Parameter . | Value . | Source . |
|---|---|---|
| Sediment grain size distribution | 0.077–0.50 (d50: 0.15) | Consistent with Coleman (1969) |
| Manning's roughness coefficient | 0.018, 0.025, 0.035 | Jung et al. (2010) |
| Effective river width | 300–10,000 m | Goswami (1985) and Coleman (1969) |
| Length | 184.7–200,000 m | Estimated from GIS and Google Earth |
| Slope | 0.000079–0.0168 m/m | Mahanta et al. (2014) |
| Manning's n | 0.025–0.04 | Jung et al. (2010) |
| Surface storage | 6.85–50.8 mm | Bennett (1988) |
| Maximum infiltration rate | 12.6–137.1 mm/h | Rawls et al. (1982) |
| Erodibility factor | 0.05–0.086 | Soil map |
| Practice factor | 1 | Scharffenberg (2015) |
| Topographic factor | 0.3–1.9 | Slope and length |
| Cover and management factor | 0.0001–0.44 | Land use map |