drain under side glass in back, 97 tahoe?

Just wondering if there might be a drain under the side glass in the very back. I thought i saw what might have been one but it was a little dark and
couldnt tell for sure. Im having problems with water getting in the floor in the back and thought maybe the drain could be clogged. This truck has seen the mud once or twice so its possible if there is such a thing. Thanks Brian
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