_RL     runoffperiod

     &       runoffperiod,      runoffStartTime,

     I     runoffStartTime, runoffperiod, runoffRepCycle,

     I     runoffStartTime, runoffperiod, runoffRepCycle,

     I                    'exf', 'runoff', runoffperiod,

     I     runoffperiod, exf_inscal_runoff, runoffconst,

     I     runoffperiod, exf_inscal_runoftemp, runoftempconst,

     &         runoffRepCycle,    runoffperiod,    runoffStartTime,

      runoffperiod       = 0.0 _d 0

     I      runofffile, runoffRepCycle, runoffperiod,