Vetiver taludes australia paultroung
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Transcript of Vetiver taludes australia paultroung
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INTRODUCTION This presentaDon shows the effecDveness of VeDver
System Technology (VST) as a tool of bioengineering as compared with other commonly used methods to control erosion on steep slopes.
The site was on a highly erodible fill materials consisted of weathered sandstone and sandy soil. It is on a very steep gradient, averaging 45 degrees and up to 50 degrees at some secDons.
The original baVer was built from material excavated and pushed down slope for a home site on a very steep mountain range
The climate is subtropical, with cool and occasional frost in winter, and wet summer with prolonged period of high intensity rainfall and occasional cyclonic downpour
This presentaDon shows the result two years aXer implementaDon aXer numerous storms and recently a 350mm rainfall over a 5 day period.
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This is a very complex site, with very steep gradient in two direcDons, with slope gradient up to 500 in some
parts
100m long, up to 500
400m long, up to 450
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Original baVer from material
excavated and pushed down slope for a home site
House
House
100m long, up to 500
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Original baVer from material
excavated and pushed down
slope
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House
Front of the house
House
100m long, up to 500
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Hydroseeding with turf grass to control erosion and stabilise the
baVer
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Rilling started soon aXer
Hydroseeding
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Rilling started soon aXer
Hydroseeding
House
100m long, up to 500
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Rilling was so severe that a geofabrics was
used to cover the whole baVer to prevent further
erosion
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House
A very elaborate and expensive operaDon, including sand bags to weight down the geofabrics cover
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Lomandra, a shallow rooted ornamental
species was planted to stabilise the baVer
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Despite this costly measure the baVer collapsed during an average summer rainfall and it was rebuilt with imported fill materials
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The baVer was rebuilt with imported fill
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Concrete blocks was built as retaining wall at the foot of the baVer
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Laying Geo\rics: Jutemesh
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VeDver planDng
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VeDver planDng
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Six months aXer planDng
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8 months aXer planDng
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10 months aXer planDng
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Two years aXer planDng, aXer
slashing
Two years aXer planDng, before slashing
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Two years aXer planDng, aXer
slashing
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Two years aXer planDng, prolific growth, 2.5m high with roots to at least 2m
deep
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PracDcally no sediment in
downslope drain
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CONCLUSION
This presentaDon shows the superiority of VST as compared with other commonly used methods to control erosion on steep slopes, both in term of effecDveness and cost.
VST has passed the ulDmate test two years aXer implementaDon with a recent rainfall period of over 350mm in 5 days.
In addiDon to its steep slope stabilisaDon efficiency, it also completely prevented sediment moving down the slope