alt Hacker NewsDepends on the cooling system, but around 1 to 9L per kwh. [1]
A lot, but not all, of these datacenters are using evaporative cooling, which is what kicks their water usage so high.
So a 40MW datacenter will consume around 4 million liters of water per day if it is evaporatively cooled.
[1] https://www.fwpcoa.org/content.aspx?page_id=5&club_id=859275...
As a comparison, one acre of alfalfa growing year round in California uses about 5*325000=1,625,000 gallons of water a year for four harvests, 4400 gallons of water per day per acre.
There’s around a million acres of alfalfa grown in California for a total water usage of 1,625,000*1,000,000=1.625×10¹² gallons (or 5 million acre-feet) per year.
365 million gallons of water per year for one data center is 1000 acre feet of water. California’s alfalfa crop uses as much water as 5,000 of these data centers.