DC sparks from my flyback supply with a 0.2 uF capacitor providing a spark energy of perhaps 10 joules at 10 kV. In air this spark will jump less than 1/2 inch (1.25 cm) but water surface tracking means that this will be many times longer and gives a widely branching long spark suggesting a much higher voltage.
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A long exposure of multiple shots shows the water surface effect.
A long exposure of multiple shots shows the water surface effect. If a spark reaches the side the other electrode about 4 inches away then it will discharge the full 10 joules with a big bang. Picture scale is about 3 inches (7.5 cm) across.
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Google+ post: mine
Photo Date: 2007