Directing water to a tree to grow almonds, and directing it to a stream to support the delta smelt are both human directed usages. You can't just count the usages you don't like to make the number look big.
If you're looking at it this way, that every single stream is managed, then yes, you're right. I rather think that we develop only the water sources that make the most sense and leave the rest be.
This way we could talk about the incredible amounts of gold that is diluted in oceans that we could harvest "anytime" [0]. It's around 21x more than humans mined in the whole history.
This way we could talk about the incredible amounts of gold that is diluted in oceans that we could harvest "anytime" [0]. It's around 21x more than humans mined in the whole history.
[0] http://oceanservice.noaa.gov/facts/gold.html