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culvert into the main structure may compromise the stability of the structure due to the lack of support at the discharge; this often constitutes additional supports in the form of structural bracing. The velocities and hydraulic efficiencies should be meticulously calculated and can be altered by integrating different combinations of geometries, components such a gradients, cascades and an adequate junction angle which is sympathetic to the direction of the watercourse's flow to minimise turbulent flow, maximise evacuation velocity and to ultimately

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