For whirlpool dishwasher models:
DU800DWG DU801DWG DU805DWG DU810DWG DP840DWG DU840DWG DU850DWG DU890DWG DU910PFG DP920PFG DP92920PFG GU940SCG GU960SCG GU980SCG
If your dishwasher leaks water out the bottom of the door the first thing you will want to check is the seal just under the spray arm.
In this video we show you just how easy it is to remove the spray arm and the top of the pump.
What happens is the screws that hold the top of the pump cover on come loose over time. The the water pressure blows the gasket out of place. The water then shots out the side of the pump and towards the bottom of the door.
In this photo you can see the loose screws at points A and B. Then at point C the water shots out the from under the cover and past the seal towards the bottom of the door making the dishwasher leak water.
For more information on your whirlpool dishwasher check out the factory service manual.
If the seal is not in to bad of shape you can take the cover off and put the gasket back in place.
In the long run it would be best to replace the seal with a new one. After all they are cheap!