1) Flash flood 2) Flow 3) Flowing 4) Inundation 5) Post-thaw flooding 6) Spate 7) Sudden flood 8) Sudden overflow 1) Rill 2) Spate 
A freshet can refer to one of the following: - Definition at Answers.com ...
• (a.) A stream of fresh water. • (a.) A flood or overflowing of a stream caused by heavy rains or melted snow; a sudden inundation.
A rapid temporary increase in stream flow due to heavy rains or snow melt.
the annual spring rise of streams in cold climates as a result of snow melt; freshet also refers to a flood caused by rain or melting snow.
Fresh'et noun [ Middle English fresche flood + -et . See Fresh , adjective ] 1. A stream of fresh water. [ Obsolete] Milton. 2. A flood or overflowing of a stream caused by heavy rains or melted snow; a sudden inundation. « C...
[n] - the occurrence of a water flow resulting from sudden rain or melting snow
An increase of water flow into an estuary during the late winter or spring, owing to increased precipitation and snow melt in the watershed 
spate noun the occurrence of a water flow resulting from sudden rain or melting snow
a freshwater stream flowing into the sea. · a sudden rise in the level of a stream, or a flood, caused by heavy rains or the rapid melting of snow and ice.