There are benefits to a rain day, you can catch up on your readings, watch a movie and fill your water tanks! Our boat holds 90 gallons of water and the fill point if on the deck about midships on the starborad side. When it rains the water runs right over the deck water fill cap. So all that is needed is a simple way to damn the water and direct it into the water tank. This picture show the water pouring into the tank and actually in this picture the tank is FULL and the water is backing up to the deck! Perfect. Before we take on water in this way, we allow the decks to be washed off first and I will even take a deck brush and scrub the deck during the start of the rain.
Video of Rain Day