The ground in upper Donside is saturated, which may go some way to explaining why the river drops slowly. Last nights rain wont have helped too much.
To be fair, when we've had snow such as this before, it does tend to take a while to fine down which is an advantange a bit later in the year as (with luck) the river will run at a good-ish height for longer.
There are still significant pockets of snow at the 'source', I drive over the Lecht pretty much every weekend at the moment and there's enough up there to suggest to me that (tropical 'spring' apart) it will still be there in late May.
In theory, Ben should be in Mexico about now - no doubt the water temperature will be warmer there
H