This type of water feature is a series of spillways, or rills. The sound is similar to that of a chorus, as opposed to that of a soloist. Each spillway has a different tone, due to the width of the opening and the length of the drop. Adjustments in both may be incorporated into the design to achieve the desired effect. The wider the opening and the longer the drop, the deeper and fuller the resulting sound will be. Contemporary Landscape by Wagner Hodgson. c.