Side slope of road cutting (height: 15-20 m)
2 years after vetiver grass planting
The vetiver slope remains completely protected
after a rainstorm of 114mm. Lower half of picture
used conventional system and native grasses.
Although the China Railway Corporation recognizes vetiver in its guidelines it has laid down provisions that VS, like other plants used, must be applied as part of masonary and geofabrics design. This defeats the $10-$15 savings per square meter that VS has over conventional "hard" technologies. Is this another "too good, too cheap" intervention to favor hard technology? Chinese highway construction companies have successfully used VS in China and Africa (see Alain Ndona's Congo paper).
|Conventional herringbone construction|
with failed vegetation - fairly
typical of native grasses.