The Catch-A-Raindrop colander connects to a vertical downspout and captures 50% of rainwater while debris is directed down the gutter, diverting filtered rainwater into a storage tank or rain barrel, or directly to a garden. As the water travels down the inside walls of the downspout, the rainwater adheres to the walls of the downspout and does not free-fall from the center. The Rainwater Colander installed inside the downspout captures water free of large debris in a 2-inch tall reservoir that has an outlet to attach to a garden hose or cap when not in use. The innovative design of the patented colander automatically diverts rainwater back into the downspout when the rain barrel is full, or a cap is attached.