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The oceans are been drained, you can see this by all the beached ships in Highway 17, plus the fact that the piers don't actually go out into the water. There were two story ideas by Valve for why this is happening.
1: The Combine are draining them (HL2, at one point in its developement, also had the Combine taking the very air and replacing it with something toxic in the "Air Exchange" facility.
2: A super-portal in the middle of the oceans leading to Xen, where all the water is going.
Neither idea is actually stated or even hinted at in game, but the oceans are definitly receeding.
1: The Combine are draining them (HL2, at one point in its developement, also had the Combine taking the very air and replacing it with something toxic in the "Air Exchange" facility.
2: A super-portal in the middle of the oceans leading to Xen, where all the water is going.
Neither idea is actually stated or even hinted at in game, but the oceans are definitly receeding.