The Handbook (pdf 4.1 MB) presents a tool for assessing if and to what extent the different objectives of a rehabilitation project were achieved.
Flood protection measures and other river engineering
works of the past 200 years have significantly
impacted Swiss rivers and streams
in numerous ways. In order to counteract ecological
impairments, rehabilitation projects
are being carried out at increasing frequency.
Rehabilitation is the term used to collectively
describe all measures for re-establishing an
ecosystem’s near-natural condition. These
measures focus on re-establishing a system’s
key elements and processes. Although rehabilitation
projects primarily address ecological
issues, they often have important implications
for society, politics, economy and agriculture.
Rehabilitation projects are conducted in
various aquatic and terrestrial habitats. The
present handbook, however, exclusively considers
rehabilitation projects carried out in
rivers and streams.
The handbook presents a tool for assessing
if and to what extent the different objectives
of a rehabilitation project were achieved. In
the present handbook, such an assessment is
defined as project evaluation. The presented
evaluation method is based on a comparison
of selected key elements and processes before
and after rehabilitation. With the help of this
tool, users can determine tendencies toward
improvement and identify persisting deficits
and deteriorations. Project evaluation is carried
out at the level of project objectives. Indicators
serve as tools for project evaluation.
Indicators are parameters, which provide important
information on a system’s elements
and processes. Their assessment can be quantitative,
semi-quantitative or qualitative.
Today, flood protection projects nearly exclusively
go hand in hand with rehabilitation
measures. The presented evaluation method
can also be applied to this type of project.
However, the evaluation does not address
flood safety. For this aspect, a separate evaluation
is therefore essential. The second regulation
of the Thur River is a fine example of a
combination of flood protection measures and
rehabilitation measures. In this
project, economical and social aspects were
considered beside environmental issues and
issues of safety (Weber 2001).