"Wetness indexis defined as WI=(As * T)/tan R where As is specific catchment area T is transmissivity tanβ is slope angle Based on a great deal of theory! Certain assumptions: a Infiltration constant across landscape b Impermeable layer at fixed depth therefore problems in karst country depositional landscape works better in erosional landscapes• ‘Wetness index’ is defined as WI = (As * T) / tan  where As is specific catchment area T is transmissivity tan is slope angle Based on a great deal of theory! Certain assumptions: a. Infiltration constant across landscape b. Impermeable layer at fixed depth - therefore problems in karst country & depositional landscape - works better in erosional landscapes