John Elliott wrote:This sounds like a job for **Mycoremediation**
What I would suggest is to plant the willows AND make sure that the willows are heavily inoculated with mycorrhizal fungi. The combination of the two will do more to remediate nasties in the runoff, than either one can alone. Eventually, if you plant just the willows, they will acquire some mycorrhizal fungi from spores that blow in, but there is nothing like pouring a cup of mushroom gazpacho in the hole when you plant the willow to make sure that there is plenty of fungi there.
I'm glad to help you plan out this remediation project, but I have a few questions:
Are there any willows there now?
Are there any oaks in the area?
What do you mean your pond has been taking abuse? Can you be more specific? Algae bloom?
Have you considered planting bald cypress as part of the water management?
How big is the pond?
Anything living in it? Fish? Turtles? Duckweed?
Are you interested in using the willows as a coppice?