00:00Wivenhoe, South East Queensland's largest dam.
00:06Our primary purpose is to provide drinking water to over 3.7 million people.
00:10It's also a crucial line of defence against flooding.
00:14The actual drinking capacity is almost at full capacity now.
00:18But if you can imagine if you have many, many metres above that of storage held,
00:23that's actually your flood storage.
00:25Wivenhoe holds 1.2 million megalitres of water when apparently full.
00:31During a flood, it can add another 2 million.
00:34As it fills beyond drinking water capacity, releases are made into the Brisbane River.
00:39What we're looking at at the moment is the main spillway.
00:41It's a flip-bucket style spillway with five radial gates.
00:45The decision about when to open the gates and by how much is made here
00:50at the Flood Operations Centre, which runs around the clock.
00:53We're assuming at any time things could escalate up.
00:56So that's why we always make sure that we're ready to respond to that.
01:00Hundreds of sensors monitor real-time rainfall, run-off and water levels.
01:05And forecasts help create a sophisticated flood model.
01:08This whole thing is extremely well set up.
01:12Properly managed, the dam reduces flood risk but doesn't eliminate it.
01:16Partly because SEQ Water has no control over the lower catchment, including the Bremer River and Lockyer Creek.
01:24And because the next drought could be just around the corner, the dam can't be emptied ahead of forecast rain.
01:31We operate in accordance with our approved flood manual.
01:35After the 2011 floods, Wyvernhoe's engineers were heavily criticised about delaying releases.
01:41Several changes have since been made.
01:44To allow us to operate our gated dams in a way that is really best practice.
01:49It's done no own환 Who is responsible for searching.
01:51We have been all set up, hundreds of latezoids, including the offers.
01:55The blipets board of the tunnel is over the상 when we're from Hannah Dotson.
01:57Marine Mae St.
02:11We have no doubt that we have no evidence to run.
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