Definition of Chalk stream is a river which derives a significant proportion if its flow from chalk groundwater.
In 2004 the Environment Agency indexed 160 chalk-streams in the Biodiversity Action Group report The State of England’s Chalk Rivers. The index in this paper includes the rivers listed in that 2004 BAP report and is an attempt to go into more detail and itemise all English chalk-streams according to the deﬁnition above. It was complied using high detail geological maps available online via the British Geological Survey Map viewer in conjunction with online satellite maps and local knowledge.
To view the index please click on the link below.
Credited to Charles Rangeley-Wilson, Dr. Haydon Bailey, as well as the Environment Agency who compiled the ﬁrst index in 2004 and WWF.