RPS Planning Transport and Environment (RPS) were commissioned to undertake a Flood Risk Assessment (FRA) for the laying of electrical cables from three offshore wind farms to an existing electrical substation at Walpole. Centrica Renewable Energy Limited (CREL) will need to extend the substation at Walpole. National Grid (NG) will also be required to extend their part of this substation to accommodate the CREL works. This FRA considers the flood risk and impacts upon the surface-water runoff regime from the laying of cables. A cumulative assessment from the proposed extension works at Walpole electrical substation has also been conducted.