low water vs neap tide

low water

noun
  • The location of low tide in a coastal area. 

  • The temporary situation of having little money. 

  • The lowest stage of a river. 

neap tide

noun
  • The tide which occurs just after the first and third quarters of the moon, when there is least difference between high tide and low tide. 

How often have the words low water and neap tide occurred in a corpus of books? (source: Google Ngram Viewer )