Restoration of Teville Stream

The Teville Stream (also known as Broadwater Stream) in Worthing was culverted in the 1960s to flow along the boundary between an Industrial Estate, a landfill site and low lying agricultural land. The culvert collected storm water runoff from the industrial estate and the suburb of Broardwater.  Consequently, water quality was consistently poor and the ecological and the hydro-geomorphological status of the chalk stream were compromised.   Edenvale Young Associates (EVY) were commissioned by the Ouse and Adur Rivers Trust to advise on the realignment of 950m of the chalk stream through farmland by-passing the existing culverts.

The scope of works included the preparation of a formal flood risk assessment, preliminary designs, detailed designs, tender and Contract documents. The proposed realignment was modelled using 1D-2D modelling of the site (FMP- TUFLOW) in order to represent the baseline flood outlines and the stage and velocity profiles used to determine channel geometries for a range of flow conditions. The geomorphological design of the channel was undertaken in Civil Cad3d and involved varying the plan form of the bed in order to provide variation in velocity and stream power. It is expected that a period of adjustment will result in a stable longitudinal profile.