Lewisville is dumped directly into the trinity river from the Lake Lewisville Dam Basin. Grapevine dumps directly into Denton Creek which then dumps directly into the Trinity river. The COE decides what and when depending on what is happening down stream.
It appears they let more water out of Lewisvile over Grapevine but you have to also understand that they dump Ray Roberts into Lewisville. So in essence there are two lakes to draw down north and one west.....
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