Assessment levels of the modular
Level I - Regional survey
On level I, all watercourses in a in a relatively large area (canton,e.g.)
are surveyed. The depth of investigation and input of resources per river
section are low compared to other levels. In general, only a small number
of key parameters are investigated. The studies are designed to give specialists
and decision makers in political and administrative authorities a rapid
overview of the ecological condition and the impairment of surface waters.
To facilitate this process, a standardized classification system is used
as far as possible in the various modules. The assessments can then be
reported with the aid of large-scale maps.
Level II - System scale survey
System scale surveys involve the investigation of selected surface water
systems, i.e. a waterbody including the inflowing streams and rivers.
The study depth and input of resources per river section are greater than
at level I. A detailed analysis of ecological deficits provides the basis
for the planning and prioritization of rehabilitation measures appropriate
to the system. As far as is possible and reasonable, the results of regional
surveys are fed into investigations at the system scale level.
Level III - Reach scale survey
Reach scale surveys involve resource-intensive, targeted investigations
of specific problems affecting particular sections of waterbodies. The
Modular Stepwise Procedure provides only general information concerning
this level of investigation, as the methods and assessment criteria applied
will depend on the individual problem.