Belfast Sewer Vortex Drop

Client: Morgan Farrans JV
Scale: Multiple

The model study was required to investigate concerns regarding the hydraulic performance of the receiving shaft/tunnel arrangements and to establish modifications, where considered necessary, to achieve satisfactory performance within the receiving shaft/tunnel.

A generic model arrangement was constructed to investigate the hydraulic characteristics of the receiving shaft/tunnel arrangements for each of the six drop shafts.  The receiving shaft was modified for each of the six arrangements to provide a representation of the outlet conditions at each shaft.

Each vortex drop shaft arrangement was tested at up to the design 1 in 30 year storm flow and conditions of free discharge and surcharged operation were simulated within the receiving shaft.