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I have not encountered this term before. That said, I can see two related interpretations for the phrase. The first refers to the physical capital used to collect, store, retrieve, salvage, improve, transport, and utilize water resources. This would embrace wells, pumps, desalination plants, pipes, water treatment plants, irrigation, and aquifers.The second would be something of a misstatement in which water is capital, a factor of production. Now, water is generally considered to be a resource, not capital. But, at the same time, water resources and the capital used to exploit them may be bought, sold and transported in much the same way as capital and in these cases may function in much the same way as capital, economically. A well-capitalized farm, for example, could be one that not only has superior equipment, but one which has used its wealth to secure greater access to irrigation. Of course, this could apply to many other industries, as water and the means to exploit it is a key factor of production in many, many industries.