In the world of stream restoration, many purists would
like to prescribe solutions that avoid “unnatural” materials
that they consider unsightly, such as steel cables and
imported boulders ( Figure 1). Preferring to make use of
only materials that are naturally present in stream systems,
these purists would rather use a so-called organic approach
that employs only naturally occurring materials such as
large woody debris (LWD), cobble, gravel and earth.