You were at an angle of your water fountain and the water made a mist as the sun was shining over it all. I can get the same rainbow from a soaker hose and the sun just in the right location.
You were shooting into the sun. The sun was just enough out of the frame to not overexpose your meter on your camera, but was in the corner enough to give the rays. Many cool effects can be gotten from shooting into the sun - such as sillhouettes and what you have here.
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