The Collaborative International Dictionary of English v.0.48:

Inflow \In*flow"\, v. i.
   To flow in. --Wiseman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inflow
    n 1: the process of flowing in [syn: inflow, influx] [ant:
         effluence, efflux, outflow]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "inflow":
   affluence, afflux, affluxion, air current, concourse, confluence,
   conflux, course, crosscurrent, current, current of air, defluxion,
   downdraft, downflow, downpour, draft, drift, driftage, fall wind,
   flow, flow in, flow of air, flowing, fluency, flux, following wind,
   gush, head wind, indraft, indrawing, inflood, inflooding, influx,
   influxion, inhalation, inpour, inpouring, inrun, inrush,
   inspiration, jetstream, katabatic wind, mill run, millrace,
   monsoon, movement of air, onrush, onward course, outflow, pour in,
   race, run, rush, set, spate, stream, stream of air, surge,
   tail wind, tide, trend, undercurrent, undertow, updraft,
   water flow, wind