River Blackwater (River Test)

This River Blackwater drains small parts of the English counties of Hampshire and Wiltshire. It is a tributary of the River Test.

Not to be confused with River Blackwater (River Loddon).
Blackwater
River Blackwater east of Testwood Lakes
Location
CountryUnited Kingdom
RegionWiltshire, Hampshire
Physical characteristics
Source 
 • locationRedlynch, Wiltshire
 • coordinates50°59′23″N 1°42′44″W
MouthTotton
 • location
Hampshire
 • coordinates
50°55′36″N 1°29′31″W
Length45.0 km (28.0 mi)
Basin size67.5 km2 (26.1 sq mi)

Course

It rises just to the east of the Wiltshire village of Redlynch, east of Salisbury. It then flows east into Hampshire, where it flows north of the village of Wellow and the hamlet of Wigley. The river turns south, passing under the M27 and past Broadlands Lake and the Testwood Lakes reservoirs, before joining the Test between Totton and Redbridge. The Environment Agency records the length of the main river as 39.4 kilometres (24.5 mi),[1] with an additional 5.6 km (3.5 mi)[2] for the watercourse from Redlynch to the confluence north of Hamptworth.

Water quality

The Environment Agency measures water quality of the river systems in England. Each is given an overall ecological status, which may be one of five levels: high, good, moderate, poor and bad. There are several components that are used to determine this, including biological status, which looks at the quantity and varieties of invertebrates, angiosperms and fish, and chemical status, which compares the concentrations of various chemicals against known safe concentrations. Chemical status is rated good or fail.[3]

Water quality of the River Blackwater in 2019:

SectionEcological
Status		Chemical
Status		Overall
Status		LengthCatchmentChannel
Blackwater[4] Moderate Fail Moderate 5.616 km (3.490 mi) 12.068 km2 (4.659 sq mi)
Blackwater (Test and Itchen)[5] Good Fail Moderate 39.362 km (24.458 mi) 67.526 km2 (26.072 sq mi)

See also

This River Blackwater should not be confused with the River Blackwater in north-east Hampshire, which is a tributary of the River Loddon and (indirectly) of the River Thames.

Another similarly named waterway in Hampshire is Black Water, a small stream which flows eastwards across the New Forest, passing under Rhinefield Ornamental Drive, before joining Ober Water and Highland Water just north of Brockenhurst to form the Lymington River.

References
  1. "Blackwater (Test and Itchen)". Environment Agency - Catchment Data Explorer. Retrieved 23 December 2017.
  2. "Blackwater". Environment Agency - Catchment Data Explorer. Retrieved 23 December 2017.
  3. "Glossary (see Biological quality element; Chemical status; and Ecological status)". Catchment Data Explorer. Environment Agency. 17 February 2016.
  4. "Blackwater". Catchment Data Explorer. Environment Agency.
  5. "Blackwater (Test and Itchen)". Catchment Data Explorer. Environment Agency.
  • ^ Ordnance Survey (2004). OS Explorer Map OL22 - New Forest. ISBN 0-319-23616-1.
  • ^ Ordnance Survey (2004). OS Explorer Map 131 - Romsey, Andover & Test Valley. ISBN 0-319-23600-5.


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