Aerial view of SuDs The cascading channel lined with the Rock Rolls and Rock Mattresses are delivered to site ready filled, lifted off the lorry and lowered into place on the prepared graded profile. The cascading channel lined with the Rock Rolls and Rock Mattresses are delivered to site ready filled, lifted off the lorry and lowered into place on the prepared graded profile. The cascading channel lined with the Rock Rolls and Rock Mattresses are delivered to site ready filled, lifted off the lorry and lowered into place on the prepared graded profile. The cascading channel naturalising.