Brian,

I suggest a literal translation:
full water consumption (including circulating water supply and [?])

See: http://www.birthright.net/dm/adventures/arador.html

"Chance of death is cumulative over successive days, and animals which go more than two days without water will be unable to carry any weight, requiring an equal number of days of rest and *full water consumption* to recover".


See also:
http://webworld.unesco.org/water/ihp/db/shiklomanov/summary/...

"Thus, the system of *circulating water supply* excludes the discharge of used waters back into water bodies or water streams and envisages their multiple use in production".

It depends on the context: if you're talking about specifications that are required - then it's "water requirement," and if the text is stating, how much a water user consumes, then it should be "water consumption".