Welcome back Loretta!! We missed you!! Glad you stopped back.
I can't help with this question except to say that gathering all the free water you can and diverting to the pond sounds great. I don't think you will need a tight filtration netting, a few stones from the roof won't hurt. You may need a larger 'trash trap' maybe with 1" gaps to catch the heavy mass of maple 'helicopter' seeds, or the heavy spring seed pods from Oak trees if they are overlying the roof as they do tend to build up in gutters in the spring.
How is your pond otherwise? How are your YP? are you stocking new things or just enjoying what you have?
