How many letters does the top answer for “the occurrence of a water flow resulting from sudden rain or melting snow” have?

The most common answer is freshet (7 letters).

Crossword clue: the occurrence of a water flow resulting from sudden rain or melting snow

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

freshet 7 letters wn-def

the occurrence of a water flow resulting from sudden rain or melting snow

spate 5 letters wn-def

the occurrence of a water flow resulting from sudden rain or melting snow