score:9
They dye it to cover the color the soil it's built on would usually give the water:
"If thereβs any drawback to BSR itβs that, because all the water attractions are man-made and dug into the clay soil of central Texas, the water would normally be an unpleasant gray color. So they dye it, either an unnaturally garish turquoise or a drab olive green."
Citation: http://www.expressnews.com/lifestyle/travel-outdoors/article/Slip-slidin-away-6472109.php