Water pan is not something that I am familiar with, but if you are getting water on the floor on the passenger side then your heater core may be leaking, the drain tube for the ac is blocked ( it sticks out through the firewall on the passenger side and can be cleaned out with a coat hanger or compressed air).
it may be caused by the drain hole from the window screen being blocked it is located under the battery also check that the rain bar on top of the pollen filter is still there and not been left off allowing rain to travel in and down the heater pipes.
Rain is part of the water cycle and occurs under many varied conditions, all of which may condense liquid water from gaseous water vapor.
It wouldn't rain in the coral reef because it is under water.
under the bonnet passenger side bottom of windscreen under plastic rain cover deflector whilst your doing that clear debri from rain drain both sides good luck
Water wells are come from under ground water and its contain dirt and rain water.
The rain shadow effect is when there is an area of land that is blocked from precipitation by mountains.
Does it leak on the passenger front flooor?
It's away from sunshine which avoids it drying out an dehydration. It also avoids being blocked by rain, water and dust.
rain water-filled petioles