Filling of first River mattresses proceeding – 30 September 2011

Rock for mattresses are also 100-67% of layer depth, so 200mm for the 0.3m depth. The mattress thus has at least two layers of rock to prevent soil scour in the event of high water velocities. Mattress lids are supplied separately so as to have them out of the way during infill of rock. From a labor point of view we allow 1.0m3/man per day for gabions and 1.5m3/man/day for mattresses, as mattresses have now bracing and neat front facings that need to be maintained.

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Installation of the Reno Mattress apron proceeding well – 3 October
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Geotextile and River mattress foundation laid – 27 September 2011

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