Pillhill Brook

[4] The brook rises near Fyfield and passes Thruxton before flowing through Anna Valley past the villages of Abbotts Ann, Little Ann and Amport, joining the River Anton near Upper Clatford,[3] which flows in turn into the River Test.

[1] in 1813, the brothers Robert and William Tasker set up the Waterloo Ironworks in the Anna Valley at Upper Clatford, using a waterwheel driven by the brook to power the forge.

They specialised in making agricultural equipment, progressing to the manufacture of steam traction engines from 1865.

[8] The Environment Agency measures water quality of the river systems in England.

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.