In the grand tradition of sea level experts, I added 0.3 feet to the rise rate of Lake Powell. This is justified because the lake gets wider as the elevation increases, so the true elevation doesn’t accurately reflect the increase in volume. The adjustment increases the elevation of the lake by more than two feet.
Does this adjustment sound like bullshit? It sounds that way because it is bullshit – and nearly identical logic to the GIA used by sea level experts.