AC leaking

We've had alot of rain here in PA the last couple of days, but I didnt have any problems with leaks until this morning. Last night coming home, I had my A/C on and this morning I cam out to a puddle of water on the passanger side floor. Theres a small black box under the glove box close to the door, the water seems to be coming from that....any suggestions??? thanks in advance

The black box holds the evaporator for the AC. When cooling the air, it condenses the humidity out of the air and it collects in the box. There is suppossed to be a drain on the firewall for that box, to drain out that water, if its clogged the water will collect until it spills out.