Comparison of the components in the original Gash model with those of some RSGMs
| Original version | Revised version | |||
|---|---|---|---|---|
| Gash (1979) | Gash et al. (1995) | Valente et al. (1997) | This study | |
| For m small storms insufficient to saturate the canopy |  |  |  |  |
| Wetting up the canopy, for n storms that saturate the canopy |  |  |  |  |
| Evaporation from saturation until rainfall ceases |  |  |  |  |
| Evaporation after rainfall ceases |  |  |  |  |
| For m+n−q (original version) or n−q (revised version) storms that do not saturate the trunks |  |  |  |  |
| SF |  |  |  |  |
| TF |  |  |  |  |
| Original version | Revised version | |||
|---|---|---|---|---|
| Gash (1979) | Gash et al. (1995) | Valente et al. (1997) | This study | |
| For m small storms insufficient to saturate the canopy | | | | |
| Wetting up the canopy, for n storms that saturate the canopy | | | | |
| Evaporation from saturation until rainfall ceases | | | | |
| Evaporation after rainfall ceases | | | | |
| For m+n−q (original version) or n−q (revised version) storms that do not saturate the trunks | | | | |
| SF | | | | |
| TF | | | | |
m = number of small storms insufficient to saturate the canopy (dimensionless), j = number of rainfall events, p = free throughfall coefficient (dimensionless), pt and pd = drainage partitioning coefficient (dimensionless), n = number of storms sufficient to saturate the canopy (dimensionless), 
= amount of rain necessary to saturate the canopy (mm), S = canopy storage capacity per unit ground area (mm), PG = amount of total rainfall (mm), 
= mean evaporation for saturated canopy conditions (mm h−1), 
= mean rainfall rate for saturated canopy conditions (mm h−1), q = number of storms that saturate trunks (dimensionless), St = trunk storage capacity (mm), SF = stemflow (mm), TF = throughfall (mm), c = canopy cover fraction (dimensionless), Sc = canopy capacity per unit area of cover (mm), 
, 
= mean evaporation rate from the saturated canopy (mm h−1), I = rainfall interception (mm), 
= 0.02, a constant describing the evaporation rate from saturated trunks as a proportion of that from the saturated canopy.