Cowl water drainage holes - where are they

[67gmcstepside]

I washed the truck today and water was pouring out of the kick panel vents. It's been parked under a pine tree with the cowl off and it looks like the drainage holes are clogged by pine needles. Where are the holes that drain the water to the bottom of the fender. I was just about to install the new carpet but now with this new challenge that we have to wait. Any information would be appreciated, thanks.
don
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