You have seen thousands of photos of Skógafoss, the iconic waterfall in South Iceland. Can you tell what is special about the image below?
The answer lies in the second photo. In 9 out of 10 images of this waterfall (Google it), there is a persistent notch, a thinning in the curtain on the left side of the falls. The water is not distributed evenly across the lip. During very occasional periods of substantially elevated discharge, the Skógá river activates sections of the lip that are normally only weakly supplied. The result is a nearly continuous curtain across the full width, an uncommon sight at Skógafoss.
A short video illustrating the two states is presented in the reply below.
Skógafoss, full flow
Canon EOS 5DSEF100-400mm f/4.5-5.6L IS II USM lens300mmf/7.11s160 ISO0.0 EV
Skǿgafoss, normal flow
Canon EOS 5DSEF100-400mm f/4.5-5.6L IS II USM lens263mmf/9.02s100 ISO+0.3 EV
