The Kilmeston branch starts life in a pond close to the B3046, the road from New Cheriton to Kilmeston. It is acknowledged to be the Source of the River Itchen by the Ordnance Survey. It travels northwards.
The Kilmeston branch leaves the source pond and passes through a conduit under the B3046 to the adjacent field. It then curves to the north and passes under the A272
and then travels along the back of properties in New Cheriton. As it approaches Cheriton it joins with the branch coming from Bramdean.
following and, eventually, to run alongside the B3046