We had that problem when we added a birdcage and the rain came in torrents and couldn't drain fast enough. A DIY lives here so he rented some kind of tool and drilled a few drainholes through the concrete at an angle to the outside. He thought that was best in our case and it works really well.
If you want a more conventional solution, call BJ's Service. He has a nifty gizmo that he just patented, that installs in the bottom framing. He'll come over and give you a free demo. I don't remember the cost but it seemed reasonable. His phone number is 352-259-2744 or 352-454-6448.
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