1 A sequence of small waterfalls.

2 A configuration in which the output of one component is the input of another. Thus, the catchment hydrological cascade is: bedrock, cascade, step-pool, plane-bed, riffle-pool, and dune-ripple (Branefirun and Roulet (2002) Hydrol. & Earth. Sys. Sci. 6, 4). See Couthard and Van Der Wiel (2007) Geomorph. 91, 3–4: ‘River systems can be viewed at distinctive hierarchical levels that represent a cascade of geomorphological interrelationships’.

http://www.environment.gov.au/system/files/resources/94149200-d4c7-4228-9eea-0520f645d400/files/protocol-1.pdf AUSRIVAS, Parsons et al. (2002).