My friend, Jane Nelson, just asked me how to measure a cascade's height.

The most significant measurement is the length of the tail, which is measured
from the point at which it turns down to the tip.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)