Today, the waterfall screen was being tested, with water spraying across one half of the ring. Water screens have been used in several nighttime spectaculars at Disney Parks, including Fantasmic! and Rivers of Light, but never from a barge like this.
The water can be seen in these photos on the left half, almost looking like a sheet of cellophane stretched from top to bottom.
Just the water was spraying and nothing else was being tested.
Keep checking WDWNT for updates on “Harmonious” at EPCOT.