How Does It Work? At the heart of a pondless waterfall is a cleverly concealed underground reservoir. This reservoir houses a pump that propels water from the basin up to the waterfall’s starting point, where it then cascades down over rocks or through specially designed features, creating that beautiful waterfall effect. Once the water reaches the bottom, it’s collected in a grate-covered area and directed back into the reservoir, ready to be pumped back up again. This closed-loop system means