A new intake was proposed upstream of FWPM gravel beds. Geomorphological surveys were undertaken followed by detailed modelling which was integrated with FWPM survey findings. This led to engineering recommendations being made to set limits for abstraction and the design of the intake to minimise impacts on sediment transfer.
Poorly designed culverts on forestry haul roads led to discharge bed scour which in turn made impassable steps and low flows in the culverts. Engineering, flow and fisheries assessments enabled cost effective pre rock step pools to be designed and installed. The flexible design was applied to multiple culverts.
A new water abstraction intake was proposed but high boulder bed-load and fish migration issues ruled out a Coanda weir. Detailed flow, geomorphology, fish, and ecology monitoring then assessments led to the design, permitting and building of an in-bed drop screen which ‘engineered out’ fish and geomorphological impacts.