Stream bank erosion is a dynamic and natural process as rivers meander across their floodplains. However, human influence through catchment development, stream regulation, removal of large wood, and clearing of riparian vegetation, can greatly increase the rate of bank erosion, sometimes to unacceptable levels.
Rapid bank erosion leads to loss of valuable land, reduced water quality as sediment and nutrients enter the stream, as well as threatening infrastructure such as roads, bridges and buildings. Stream bank erosion is the dominant source of sediment in many river systems, and sediment loads in Australian streams have generally increased by 10 to 15 times in comparison with pre-European loads in intensively used river basins (National Land and Water Resources Audit 2002).
There are three main processes that cause bank erosion (scour, mass failure and slumping), and it is essential to determine which are operating at any particular site because the management required to slow or prevent them may differ. The relative importance of the three erosion processes often varies with position in the catchment.
Slowing bank erosion
Maintaining healthy vegetative cover on the bank itself, and along the top of it, is one of the cheapest ways of slowing the rate of bank erosion, but sites with a high risk of erosion (sub-aerial erosion, mass failure, fluvial scour) and high stream power may require in-stream works to, for example, protect the toe of the bank. Given the importance of vegetation in slowing bank erosion, control of grazing animals if often the first step to improved management.
Rainfall over much of Australia is highly variable by world standards. The combination of large catchments and periodic large rainfall events means that flood flows are not uncommon. A flood occurs when water goes over the top of a stream bank and out of the channel. Human activities such as clearing catchment and riparian vegetation, constructing weirs and impoundments, and removing large woody pieces from the channel, can all influence the frequency, duration and level of floods. With the current interest in riparian rehabilitation, the effects of revegetation on flooding also needs to be understood at both a catchment and a reach scale.
Our resource pack contains:
Fact sheet 2 – Streambank stability
Fact sheet 3 – Improving water quality
Fact sheet 8 – Inland rivers and floodplains
Fact sheet 13 – Managing riparian widths
RipRap 10 — Streambank Stability: why, what, where & how?
RipRap 14 — Managing and rehabilitating riparian vegetation
RipRap 22 — Riparian Research —A second phase of the National Riparian Lands R&D program
RipRap 23 — Managing Riparian Land To Achieve Multiple Objectives
RipRap 25 — Catching up on contaminants
RipRap 26 — Tools and Techniques for River Management
RipRap 31 — Wrapping up riparian
Guidelines and manuals
Principles for riparian lands management, 2007 (Chapter 5, 6)
Riparian Land Management Technical Guideline Updates
Number 1 (May 2001) — Designing filter strips to trap sediment and attached nutrient
Number 3 (July 2003) — Managing wood in streams
Number 5 (October 2004)— Managing high in-stream temperatures using riparian vegetation
Number 6 (June 2006)— Controlling willows along Australian rivers
Design guideline for the reintroduction of wood into Australian streams
A Rehabilitation Manual for Australian Streams: Volume One & Two
Managing Riparian Land for Multiple Uses, Lisa Robins
Powerpoint presentation template
A powerpoint presentation template you can use to reflect local riparian characteristics, by inserting photos and examples from your region. The powerpoint presentation has notes to accompany each slide, explaining the key point being made and how you might explain it to others.
Download the resource pack.
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