Students from Apii Takitumu and Apii Te Uki Ou planting erosion control vegetation at the Avana geobag revetment. 22120902
Almost two years ago to the day we completed construction of a 45 metre stretch of geotextile sand bag (geobag) revetment wall at Avana Harbour, to help protect the foreshore from erosion.
of that work over 12 months showed that while the geobags were doing a good job
of preventing erosion from the ocean swell, erosion at the Muri end of the wall
was still occurring.
was most likely due to the longshore current coming down from Muri as the water
made its way to and out of Avana Passage.
try and solve this problem, we applied for and received a small Smarty Grant
from the Australian High Commission to add some additional bags to the southern
end of the revetment and to also curve it inland slightly to prevent the
longshore current getting in behind the geobags.
getting technical advice from experienced coastal engineers and the final
approvals from the National Environment Service, we completed an extension to
this geobag revetment last week.
used the same company as two years ago, S and T Contractors, to do the work of
filling, placing and moving the nine additional bags into their new
Wednesday morning this week students from Apii Takitumu and Apii Te Uki Ou
joined us in a mutually beneficial exercise, planting the foreshore behind the
wall to help its stabilisation.
project benefited from having many young enthusiastic hands making light work
of digging and planting, and the students got the opportunity to learn from experts
on some innovative solutions to coastal erosion.
students helped us to plant vetiver grass, beach vines and some coastal trees
to help hold the sandy soil together during any high water events and during
Environmental Care provided the planting material and helped out on the day
instructing the students in planting techniques to give the plants the best
chance of survival.
Ngati Manavaroa were also on hand to help out with the work.
a student from Apii Te Uki Ou, when asked what he learned from the day, said
“the plants that we planted today will help hold the sand in the future, after
the sand bags eventually get damaged or rot away”.
really does sum up the project in one sentence.
we started this project two-years ago there has been a lot of interest from
others both in Rarotonga and from the outer islands in this geobag
particular, the large scale erosion caused by sustained high water levels
around Titikaveka back in July this year has prompted a lot of interest from
beachfront tourist accommodations.
door is always open if anyone would like to learn more about this project, or
in fact any of the other projects we are involved in, including rat
eradication, sustainable tourism, waste management and campaigning for a
Ipukarea Society would like to thank all those involved in this pilot project,
including the Australian High Commission in Rarotonga, Muri Environment Care
Group, Apii Takitumu and Apii Te Uki Ou, S and T Contractors, Ngati Manavaroa,
the National Environment Service, our engineers Paul Maoate and Matt Blacka,
and Cook's buses for the student transport.