Following on from developing a feasibility study and topographic surveying for the London Borough of Enfield (LBE) council’s restoration vision for a ‘Stage 0’ rehabilitation of Salmons Brook, Enfield, cbec undertook an inception study and provided technical assistance for the project in the spring and summer of 2021
Existing datasets provided sufficient evidence to support the notion that Salmons Brook could be restored to either an anastomosing channel or a sinuous single thread channel with a highly connected floodplain, both of which are consistent with current interpretations of Stage 0 (or Stage 1) restoration approaches according to the balance of valley processes. The compiled feasibility study enabled the interpretation of the key physical processes and constraints throughout the study site that influence the channel form, flow regime, ecological condition and capacity for channel recovery from disturbances.
cbec was also contracted to identify missing or inadequate elements of the feasibility study for the current project. One of the key limitations identified for Stage 0 design purposes was the lack of topographic survey data (particularly within the channel itself); therefore, a topographic survey was undertaken by a number of experienced cbec field staff in February 2021 using a combination of Trimble R12 real-time kinematic GPS and Trimble S6 total station to address these limitations. Upon collation of all the available data regarding the topographical, geomorphological, hydrological and Water Framework Directive status of Salmons Brook, cbec created an action plan for the development of possible restoration options within a feasibility study. The feasibility and conceptual design phase was completed by March 2022 and facilitates the development of detailed designs, gathering of regulatory consents and a business case for implementation funding with a view towards project implementation during summer 2023.