River Nadder

The river flows north from Ludwell to West End where it is joined by the Ferne Brook, close to the Lower Coombe and Ferne Brook Meadows[1] site of special scientific interest (SSSI).

The river then flows east through Tisbury, where it is joined by the Fonthill Brook, and then onto Barford St Martin and Burcombe before reaching Wilton.

[8][9][10][11] The Environment Agency measures the 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.