spate

current, river, stream, tide

cloudburst, discharge, flush, gush, outflow, outpouring

flux, inflow, influx

engulfment, washout

avalanche, blizzard

cascade, waterfall

excess, glut, overabundance, overage, overkill, overmuch, oversupply, superabundance, superfluity, surfeit, surplus

epidemic, plague, rash

bonanza, embarrassment, excess, overabundance, overage, overkill, overmuch, oversupply, plethora, redundancy, superabundance, superfluity, surfeit, surplus

deluge, flood, overflow

army, bevy, cram, crowd, crush, drove, flock, herd, horde, host, legion, mob, multitude, press, score, sea, swarm, throng