River Purwell
The River Purwell is a chalk stream in Hertfordshire, England. The entire course of the stream is near Hitchin.
Its source is springs which rise out of the chalk bedrock at St Ippolyts, forming Ippollitts Brook. It is known as the Purwell by the time it reaches Ninesprings in the parish of Great Wymondley. It flows on to join the River Hiz.
The river and associated wetlands are protected by nature reserves at Ninesprings and Purwell Meadows in Hitchin.
At the latter site the river formerly powered a watermill.
