Division Water category Rivers Geographical Intercalibration Group Central-Baltic rivers

United Kingdom

Description of types that have been intercalibrated

Type	River characterisation	Catchment (km²)	Altitude and geomorphology	Alkalinity (meq/l)
R-C1	Small lowland siliceous sand	10 — 100	Lowland, dominated by sandy substrate (small particle size), 3 — 8 m width (bankfull size)	> 0,4
R-C2	Small lowland siliceous — rock	10 — 100	Lowland, rock material 3 — 8m width (bankfull size)	< 0,4
R-C3	Small mid-altitude siliceous	10 — 100	Mid-altitude, rock (granite) — gravel substrate, 2 — 10 m width (bankfull size)	< 0,4
R-C4	Medium lowland mixed	100 — 1 000	Lowland, sandy to gravel substrate, 8 — 25 m width (bankfull size)	> 0,4
R-C5	Large lowland mixed	1 000 — 10 000	Lowland, barbel zone, variation in velocity, max. altitude in catchment: 800 m a.s.l., > 25 m width (bankfull size)	> 0,4
R-C6	Small, lowland, calcareous	10 — 300	Lowland, gravel substrate (limestone), width 3 — 10 m (bankfull size)	> 2

Countries sharing types that have been intercalibrated:

Type R-C1:

Belgium (Flanders), Belgium (Wallonia), Germany, Denmark, France, Italy, Lithuania, the Netherlands, Poland, Sweden, United Kingdom

Type R-C2:

Spain, France, Ireland, Sweden, United Kingdom

Type R-C3:

Austria, Belgium (Wallonia), Czech Republic, Germany, Poland, Spain, Sweden, France, Luxembourg, United Kingdom

Type R-C4:

Belgium (Flanders), Belgium (Wallonia), Czech Republic, Germany, Denmark, Estonia, Spain, France, Ireland, Italy, Latvia, Lithuania, Luxembourg, the Netherlands, Poland, Sweden, United Kingdom

Type R-C5:

Belgium (Wallonia), Czech Republic, Estonia, France, Germany, Spain, Ireland. Italy, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Sweden, United Kingdom

Type R-C6:

Belgium (Wallonia), Denmark, Estonia, Spain, France, Ireland, Italy, Poland, Latvia, Lithuania, Luxembourg, Sweden, United Kingdom