Since my "darkroom" doesn't have running water. I use my bathroom for washing prints. I place my home-made washer on the toilet with the overflow tubes draining into the bowl.
But that's not the answer to Sean's question.
After about Ten minutes of listening to the washwater musically tinkling into the bowl, I find it urgently necessary to run out into the back yard and press a nearby tree into service for a purpose for which it was never intended.
That's the worst 'rigged' thing