Водность текста – это процент содержания в нем ничего не значащих, не несущих полезной информации слов (стоп-слов). Максимально допустимым показателем водности можно считать 60%
https://contentmonster.ru/ur-6-vodnost-teksta#:~:text=Воднос...


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Replace highly specialized terms with simple, straightforward words. Shorten complex and long sentences. Remove the “wateriness” of the text as much as possible, and exclude stop words. These actions will increase the level of readability of the publication
Read more: https://www.plerdy.com/blog/readability/

Watery Text term explained
The watery content of text shows how it is full of irrelevant words, such as prepositions, conjunctions, frequently used momentum and others do not carry any meaning of the word.

Typically, the water content (watery) is measured in percentage and indicates the ratio of irrelevant words to the total number of words in the text. Normal 20-40%. Anything less gives the text dry/formality, and more than 40% make it blurry.

Examples:

The water content of text - 80-100%: I want to tell you something important, but, in fact, it is not necessary, as we so well understand each other;
Watery content of text 0%: Plato — mathematician-excellence, developing the algorithms of search engines.
The rate of water flow in the text can be used to determine its quality, as wateriness directly affects the perception and talks about informative/emotional. To better understand the difference, you must compare several texts between them.

Watery of this definition: 36% (without examples 31%).
https://seoheronews.com/watery-text