_RL exf_inscal_hflux
& exf_inscal_hflux,
I exf_inscal_hflux,
I hfluxperiod, exf_inscal_hflux, hfluxconst,
& exf_inscal_hflux, exf_inscal_sflux, exf_inscal_evap,
exf_inscal_hflux = 1. _d 0