Wambo Coal AEMR 2011-2012 - Peabody Energy

2011-2012 AEMR
reference creeks for use in assessing the relative
performance of the diversion.
Recommendations were made for remedial works in
areas where it was considered that intervention was
necessary to limit continued erosion and instability
at unnaturally high rates and to reduce the potential
for the erosional features from expanding into
adjacent, stable areas. Recommendations were
also made for ongoing revegetation and
maintenance works to enhance the longer term
integrity of the diversion as a whole.
Subsequent remediation works were implemented
by Wambo Coal in 2011 in response to the review.
A second review 6 and survey of the diversion was
conducted in mid-February 2012 following additional
flow events experienced in late January early
February 2012.
North Wambo Creek Diversion - View looking
upstream from the third bend (15th February 2012)
The review involved inspections and survey of the
condition of the diversion and repeat inspections of
the reference creeks. This report has been compiled
to document the finding of this second review. The
focus of the second review has been on the
changes that have occurred in the diversion
between July 2009 and February 2012 surveys.
Recommendations are made for remedial works in
areas where it is considered that intervention is
necessary to limit continued erosion and instability
at un-naturally high rates and to reduce the potential
for the current erosion from expanding into adjacent,
stable areas. Recommendations are also made for
ongoing revegetation and maintenance works to
enhance the longer term integrity of the diversion as
a whole.
North Wambo Creek Diversion – View of Bend 8 with
rip-rap on outside bank and plantings on inside bank
(14th July 2009)
North Wambo Creek Diversion - View looking
upstream from the third bend (14th July 2009)
North Wambo Creek Diversion – View of Bend 8 with
rip-rap on outside bank and planting on inside bank
(16th February 2012)
For further information regarding any remedial
recommendations within the NWC Diversion, please
refer to Section 5.1.4.
6 Gilbert & Associates Pty Ltd “Review of North Wambo Creek
Diversion (Stage 2)”, April 2012
Page 33