[eesmith]

"it can be collected" is far different from "is collected".

If the data center uses evaporative cooling then most of the water vapor leaves that water basin. While some of that irrigation water goes into the ground and stays in the water basin for a longer time.

Likewise, if you water a lawn - and assuming you are not so daft as to do it when the sun is high - the most of the water will go into the ground, reaching eventually the acquifer or a waterway, for eventual downstream reuse.

This is why cities in dry climates, or places facing a drought, will have restrictions like "No outdoor watering between 10 a.m. and 6 p.m."