washout

(noun) the channel or break produced by erosion of relatively soft soil by water. Example: "It was several days after the storm before they could repair the washout and open the road."

(noun) the erosive process of washing away soil or gravel by water (as from a roadway). Synonyms: wash. Example: "From the house they watched the washout of their newly seeded lawn by the water."

(noun) someone who is unsuccessful. Synonyms: flop, dud.