Construction of the spillway capacity upgrade will not
disrupt current water supply to SunWater customers.
Access to the Yallakool Tourist Park and boat ramp
will not be affected. However, during construction,
access to the picnic area and second boat ramp CAPACITY UPGRADE PROGRAM
will be restricted between June and late September
for safety reasons.
SunWater understands that the local tourist park
is a popular area for visitors and will endeavour
to minimise noise disruption during the upgrade
works. Your patience during this construction
period is appreciated.
How much will this upgrade cost? Fred Haigh Dam was raised by constructing a 2 metre
To bring the dam's spillway in line with national high concrete wall along the length of the dam.
spillway capacity guidelines, the first stage of the Further information
upgrade is estimated to cost $5.7M.
Upgrade features Further information about SunWater's
The upgrade will be fully state government funded. Spillway Capacity Upgrade Program
It is important to note that the upgrade will not
increase the water storage capacity of the dam. is available on our website:
Why must the spillway be upgraded now?
This will remain at current levels. www.sunwater.com.au
In this current period of drought, it's difficult to
The first stage of the upgrade to the Bjelke- Alternatively, you can phone
imagine rainfall of this nature, however, as
Petersen Dam spillway will involve raising the top SunWater on (07) 4132 6200.
weather patterns can range from one extreme
of the saddle dam and main dam by 1.2 metres to
to another, it's important that we take action now
prevent excess water from spilling over the dam
based on this new data. If the spillway does not
wall during extreme rainfall. This additional height
have this capability to pass excess water in a safe
will allow the dam to hold excess water until it can
manner, extreme floodwaters could cause a failure
pass safely through the spillway. The length of the
of the dam wall.
saddle dam wall will also be extended.
It would be remiss of SunWater as a responsible
dam owner not to proactively take steps to ensure 1.2 metres
our water infrastructure can withstand any Based on last year's upgrade at Fred Haigh Dam, the spillway
extreme weather conditions. upgrade will have minimal effect upon the dam’s appearance.
Spillway upgrade construction at Fred Haigh Dam, Gin Gin–
the first of the SunWater dams to be upgraded.
SunWater, the owner and operator of Why must Bjelke-Petersen Dam undergo
Bjelke-Petersen Dam, is undertaking a a spillway upgrade?
spillway capacity upgrade in 2007 to The upgrade program has been prompted by the
ensure that this dam can safely cope with Bureau of Meteorology's review of rainfall data
extreme rainfall events. This upgrade has
been fully funded by state government and
Bjelke-Petersen Dam Spillway Capacity Upgrade over the past 100 years. New projections show a
much larger extreme rainfall event may be possible
forms part of SunWater's ongoing spillway February to November 2007 than was previously believed. The Bureau has
indicated that this risk is very low being a “one in
upgrade program. 100,000” chance of occurring in any one year.
By comparison, the infamous Brisbane 1974 flood
WORKS AREA SADDLE DAM BOAT RAMP AND was a “one in 80” chance event.
Construction on the main Road will be closed YALLAKOOL Such an event has a relatively low statistical chance
dam and saddle dam will during construction TOURIST PARK of occurring. However with our current weather
occur from February to from June until late patterns experiencing cycles of extremes - both
Access will not
November 2007. September 2007. flood and drought - SunWater, as a responsible dam
owner, is taking action to ensure its dams can safely
and efficiently manage extreme rainfall events.
Following the release of the new Bureau projections,
SunWater prioritised which dams require spillway
upgrades based on the national spillway capacity
guidelines. These standards rate the dam in terms of:
■ Existing spillway's capability to safely
TO MURGON - manage an extreme rainfall event
■ Affected populations
to be extended ■ Impact to ongoing water supply in an
■ Economic impact of the dam's failure
While the spillway is extremely safe under normal
SADDLE DAM conditions, Bjelke-Petersen Dam has been
to be raised identified as the second dam to have its spillway
by 1.2 metres
WORKS AREA capacity upgraded to better manage the flows of
an extreme rainfall event and ensure that excess
SPILLWAY water can pass through the spillway safely.
to be raised
by 1.2 metres
When will this be happening?
BOAT RAMP BOAT RAMP Construction for the first stage of the Bjelke-
Petersen Dam spillway upgrade will commence in
early February 2007. Construction of stage one of
What is a spillway? YALLAKOOL the upgrade is expected to take around nine months
A spillway is a purpose-built opening in a dam wall
that allows the safe release of water downstream The first stage will vastly improve the spillway's
once the dam is full. It is designed to direct water We appreciate your patience during this construction period capability to manage an extreme rainfall event.
over the spillway rather than have it spill out over A second stage upgrade will be undertaken in
the dam wall. This ensures a safe and controlled the next five to twenty years, following completion
release of water downstream via of spillway upgrade works to some of SunWater's
a river or channel. other dams.