14 August 2016
Ernslaw One foresters, Greg Kendal and Paul Hart, were awarded an industry excellence award by the Otago Regional Council for their Slipstream Crossing device.
Applying their carpentry knowledge and skills, they developed a frame which could be made of untreated Douglas-fir or larch, based on a cattle stop, with a wooden causeway on top and steel bracing.
The vehicle wheels stay out of the water and off the stream bed at crossing points so sediment is not disturbed. Fish can travel unimpeded.
The structure is not suspended, so does not need engineering approval, is cheap, lasts around 5 to 10 years and is relocatable.
A video created by the Otago Regional Council explains how it works.