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Moving The River That Ran Through It

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"We were busy moving this
river just outside Witbank. The project was on an
opencast mine and we had to divert the river around
the 2km area to be mined. Someone then strolled in
and announced that there would be a 'controlled
flood' in five days. They said it was a regular
occurrence and seemed quite amazed that we didn't
know about it."
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Adrian Skea is the Cape Town branch
Manager of UWP Consulting. He has led an interesting
and exciting professional life since qualifying as an
engineer in 1987. "Cape Town has a different
excitement, as I am involved in a lot of interaction
with our clients and the ever-present bureaucracy.
This can almost be as exciting as a flood," he says
with a huge grin.
After spending his early career years working on
projects in Ulundi and Lesotho, Adrian was transferred
to a new JCI open cast coal mine in Witbank. "This was
a strip mining operation using a drag line. The only
unfortunate thing was that a river ran through the
mining area. 'No problem' they said, 'just move the
river.' So we built a dam at each end to stop the
flooding on the strip. We planned to deviate the river
by blasting and excavating a “new river” about 15m
deep and roughly 40m wide around the strip, but a lot
of water had to flow under the proverbial bridge
before we finally achieved our objective."
"We had to build a huge reinforced earth retaining
wall about six storeys high. That was actually quite
interesting - as we had to divert the river under the
main Richards Bay coal line bridge, and it had to go
through ninety degrees under the bridge. The earth
wall had to protect the bridge foundations and this
was a huge challenge."
Then panic! "We had just built our two downstream
coffers, and done the excavations down to bedrock and
were about to put the clay core in when we were
shocked rigid. We had been informed that a flood would
come sometime, but no-one could tell us when."
"So we got our drill rigs out, blasted for three days,
excavated using two CAT 245’s and two 35-ton dump
trucks and finished with about four or five hours to
spare." The laughter bubbles again. "Unfortunately,
the blasting had fractured the rock in between, so
when the deluge came, it flooded the excavation, so we
should just have left it alone."
"After a stint on the Sasol One mine, I realised that
I'd had enough of mining, so I joined Mike White at
UWP in Cape Town in 1994. I have done a lot of work in
Atlantis, Khayelitsha and out in the Winelands. When
Mike got transferred to Joburg, I had to take over the
Cape Town office."
UWP uses Civil Designer throughout their thirteen
offices. Seventy-five percent of their employees are
technical, but most of the design work is done in
Johannesburg, Pietermaritzburg and East London. “It is
excellent software,” says Adrian.
The reconstruction of Jan van Riebeek Drive in Paarl
brought about excitement of a different kind. This
2.1km road has taken nearly four years before the
construction commenced. "The rehab investigation was
done back in 2000. The intention was to reconstruct on
the original alignment with either four-lane
undivided, or dual-carriageway. In January 2002, a
decision was made to go ahead with the detail design,
and we were told to get on with it." |
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"There are a couple of farms alongside this section of
road. One of the farmers arrived and said, 'we have
just paid R10m for this farm, and we can't have this
road running just 20m from our front door.' We also
had to consolidate their accesses into one to comply
with the provincial guidelines."
"They then proposed that Jan van Riebeek Drive be
moved further away from their front doors and agreed
in principle to pay for the diversion. At the time
however, the neighbouring farm was up for auction, so
we had to wait for this to be finalised. In the
meantime we conducted a series of public participation
meetings. We also did a stage one scoping
investigation, got the heritage consultants and the
archaeologists in, and got the whole process going."
"Once the auction was concluded, the two farmers
confirmed their offer to fund the additional costs of
construction to move the road. Our cost estimate
indicated about a million rand extra to relocate the
road and electricity pylons etc. At that point we had
done a preliminary design. Province eventually gave
the go ahead to realign the road. They signed
contracts with the farmers and we started designing."
The new design was duly finished, but the record of
decision (ROD) took a further six months. Just before
National Heritage was about to approve, a Provincial
Heritage body was established. "So the ball was tossed
to the new body who understandably took some time to
find their feet. Finally in October 2003, the ROD was
issued, which was promptly appealed by a neighbouring
farmer during the statutory 30-day appeal period."
"The Minister of Environmental Affairs was then
suspended, leading to yet another delay. The delays
just never seemed to stop. We ended up with a R34
million budget for 2km of road, and only started the
job in August 2004, the end of the wet Cape winter.”
“The new road reserve was thoroughly soaked by a
once-in-forty-year storm, leaving the ground really
wet. The Bell dumpers got stuck, so the best solution
was to simply re-program the work, extending the
project by another month and half," he says ruefully.
"Life is definitely interesting as an engineer," says
Adrian. With unexpected floods, prickly farmers, and
public participation meetings, 'social' engineering
skills are now a definite requirement. Adrian Skea
continues to define the new role that so many civil
engineers will have to adopt - and he still manages to
laugh infectiously when the going gets tough. |
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Last Updated:
November 02, 2005
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