Darent and Cray Management Catchment
There are 2 operational catchments in this management catchment.
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The Darent is a predominantly chalk catchment covering 155sq miles. From the source on the Greensand hills above Westerham it flows east to Sevenoaks before turning north and flowing to Dartford where it meets the Thames Estuary. At the Dartford marshes the River Cray, the largest tributary within the catchment, joins the Darent.