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If you're raking them out, it's no big deal to throw them in a compost pile..
Fresh droppings shouldn't go directly to a garden
If your run is NOT covered, and it's NOT overcrowded, there's seldom a need to rake anything out at all
The birds scratch around and break up the droppings...
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Nothing will "retain water until it runs downhill"
It either runs away from the house as it falls, or it goes straight down into the ground.
Your problem with water in the basement is a drainage issue, not a "soil type" issue