_RL exf_inscal_evap
& exf_inscal_evap,
I exf_inscal_evap,
I evapperiod, exf_inscal_evap, evapconst,
& exf_inscal_hflux, exf_inscal_sflux, exf_inscal_evap,
exf_inscal_evap = 1. _d 0