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IPA Factsheet - Amberley Wild Brooks and Arun Valley
Site code
CountryUnited Kingdom
Administrative regionSouth East (West Sussex)
Central co-ordinates50o 55' N / 0o 31' W map
Altitude0 - 24

 Site Description The Arun Valley floodplain consists of a complex of meadows and drainage ditches, with a diverse flora including species of brackish, calcareous and acidic waters.

 Botanical Significance Noted for vascular interest. Amberley Wild Brooks is well known for its outstanding aquatic flora, but other parts are as rich. Although much grassland is semi-improved, some damp species-rich fields support nationally important populations of Carex vulpina and Oenanthe silaifolia. Potamogeton acutifolius is frequent in ditches. The Valley contains by far the greater part of the UK population of Leersia oryzoides. Other ditch margin species include Sium latifolium. The riverbanks support numerous plants of the rare Schoenoplectus x kuekenthalianus, some plants being morphologically close to the rare S. triqueter parent.

 General Habitat Description Inland Surface Water (major)Grassland and Tall Forb Regularly or recently cultivated agriculture, horticulture & domestic Several area are under conservation management, including Pulborough Amberley and Waltham . Grazing appears to have been implemented in these areas. Mowing for hay and silage Cattle-grazing Arable (small part only) Wildlife conservation & research Angling (small scale) and recreation

Land use

Land use% CoverLevel
mowing/hay makingUnknown
agriculture (animals)Major
agriculture (arable)Minor
nature conservation and researchMajor

Threatened Species

Species NameIPA Assess.Species Assess.AbundanceData qualityCriteria

Botanical Richness

EUNIS level 2 code & nameIPA Assess.Habitat Assess.% of indicator speciesNo. SpeciesNational BiotopeData qualityCriteria
C1 Surface standing waters2007200700unknownB

Threatened Habitats

IPA Habitat code & nameIPA Assess.Habitat Assess.AreaData qualityCriteria


DesignationProtected Area NameRelationship with IPAOverlap with IPA
Site of Special Scientific InterestAmberley Wild Brooksprotected area contains IPA326
Site of Special Scientific InterestPulborough Brooksprotected area overlaps with IPA0
Site of Special Scientific InterestArun Banksprotected area overlaps with IPA0
Site of Special Scientific InterestWaltham Brooksprotected area overlaps with IPA0
Ramsar Wetland SiteArun Valleyprotected area contains IPA327
Special Protection AreaArun Valleyprotected area overlaps with IPA326
Site of Nature Conservation ImportanceArun Valleyprotected area overlaps with IPA0
Area of Outstanding Natural BeautySussex Downsprotected area overlaps with IPA0
National ParkSouth Downsprotected area contains IPA327
Special Area of ConservationArun Valleyprotected area overlaps with IPA326


TypeDescriptionYear startedYear finishes
Other Arun Valley\Arun Valley proposed IPA.pdf
OtherKey organistations, contacts and ownership
Species Management PlanLeersia oryzoides (Cut-grass) SAP2002
Species Management PlanCarex vulpina (True Fox Sedge)2002
Species Management PlanLiparis loeselii (Fen Orchid) SAP2002
Species Management PlanSium latifolium (Greater Water Parsnip) SAP2002


abandonment/reduction of land managementlow
agricultural intensification/expansion (arable)low
intrinsic species factors (slow growth, density)high
water (drainage)high
water (management systems)high

 Conservation Issues Conversion of pasture to arable. Agricultural improvement. Mismanagement of ditches: failure to clean them &/or allowing them to dry out; over-dredging them; fencing them off from livestock; influx of agricultural chemicals following conversion to arable; influx of polluted or eutrophicated water. Inappropriate grazing usually under-grazing the problem. Mowing for silage rather than hay (late cut kills off Oenanthe silaifolia etc). Possible conflict between interests of ornithology (ground-nesting birds) and botany (some spp. like Leersia need lots of summer grazing). Inappropriate management of river banks/ damage by wash from river traffic.

Contact Information

ContactContact Type
Allan KnappData provider
Dominic PriceSite report compiler
Cath ShellswellSite report compiler