Glossar Y Vi - Planet WGSW-24010 User Manual

GLOSSARY
Audit survey Repeat survey undertaken for quality assurance purposes.
CCW Countryside Council for Wales.
Channel area The part of the river channel where macrophytes are seen submerged or
partly submerged at low flow levels. At the sides of the channel this
includes all macrophytes attached or rooted on parts of the substrata
which are likely to be submerged for more than 85% of the year.
Comparability A measure of confidence in the physical comparability of a pair of sites
based upon the similarity of width, depth, substrata, habitat, shading,
water clarity and bed stability.
Cover Value Score. The score allocated to a species resulting from the
CVS
multiplication of the Species Trophic Rank and the Species Cover Value.
DoE The Department of the Environment.
d/s Downstream.
EN English Nature.
DQI The Diatom Quality Index. A transformation of the Trophic Diatom Index
for use when comparing TDI and MTR results.
Highlighted species Refers to a plant species within MTR which is believed to be a particularly
reliable indicator of trophic status.
IFE The Institute of Freshwater Ecology.
IRTU Industrial Research & Technology Unit, Northern Ireland.
LEAP Local Environment Agency Plan.
Macrophyte Larger alga or higher aquatic plant (including bryophytes), observable to
the naked eye and nearly always identifiable when observed.
MTR Mean Trophic Rank. A numerical score assigned to a survey length based
on its macrophyte presence and abundance characteristics.
Nitrate Dissolved or soluble or non-particulate nitrate.
Non-QD Non-qualifying discharge under the UWWTD, with a population
equivalent of less than 10,000.
R&D Technical Report E38 vii