Did anyone do this problem ? ----> "Jeremy and Arnold are working on a project for math class in which they are to identify the quadratic equation that represents a rain gauge that sits off the ground

Did anyone do this problem ? ----> "Jeremy and Arnold are working on a project for math class in which they are to identify the quadratic equation that represents a rain gauge that sits off the ground. Graph each of the equations and then determine which one represents the rain catcher that is elevated. "

I can graph and determine direction and vertex but I don't understand how to determine if the graph depicts a rain gauge?