How many letters does the top answer for “the occurrence of surplus liquid (as water) exceeding the limit or capacity” have?

The most common answer is overspill (9 letters).

Crossword clue: the occurrence of surplus liquid (as water) exceeding the limit or capacity

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

overspill 9 letters wn-def

the occurrence of surplus liquid (as water) exceeding the limit or capacity

runoff 6 letters wn-def

the occurrence of surplus liquid (as water) exceeding the limit or capacity