The water is drinkable - conveniently piped into a fountain - and delicious...
Below, plants supported by the springs.
Further below, on the left, a tree on the trail, and on the right, our very fragrant native rose arching over the trail.
Called the Sundial Bridge, Calatrava is balancing tension and compression forces through the cables, the thick "sundial" structural element, and a delicate cantilevering of the walkway (note that the cables connect to the walk 1/3 of the width of the walk, not in the middle). The lines are, as always with Calatrava, clean and the solution elegant. By the way, the Sundial is designed to be accurate on the summer solstice, and there are markers on the bank indicating the time by the 1/4 hour.
I have pics of a Calatrava bridge in Bilbao - click here if you want to see them. You'll have to scroll down a bit to see them.