Homeless shelter-in-a-cart harvests rainwater

Paul Elkins responded to a Shelter-in-a-box design challenge with the "Cadillac of homeless shelters." The challenge was to design a mobile shelter to meet the demands of an ever expanding homeless population. The cart would serve as a recyclables collection vehicle by day and transform into an enclosed shelter at night for sleeping.

What caught our eye was that he designed it with rainwater harvesting.

The roof acts as a raincatcher. A first flush system diverts the initial debris when it first starts raining. Then a turn of a valve starts the collection of free water. An overflow feature allows excess water to drain to the ground. Two screens filter the water, but it is not intended for drinking without further purification measures.

More to peep here...