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John, will the flooding affect your property?

Still hasn't really reach Mannum yet. Once the wind changed from up river to down river, the water level dropped about 1/2 mtr and hasn't really not come back up much since. I get up each morning expecting to see the jetty gone completely but the pallet at the end is still out of the water.
Mannum is busy building its levee bank, but strangely part of bank isn't getting levee behind a few houses and shops, the levee will be built up the middle of the road where those places are, then it goes back to the river .... maybe they started this levee bank too late and those properties are already under water at that river line ....
So, Mannum and the Marina in particular are complaining that everyone jumped the gun with cutting off power and blocking off sewers ...... you can't please all the people all of the time, but then again, you can piss everyone off with very little effort

T1 Terry

Another update. Hi Shirley. We are about 5Klm from the river in the Loxton irrigation area and all of Loxton is on high ground and will not be effected by the high river. Still trying to find a site that gives current river heights above "pool level"
Cheers John

Slowly slowly.

The old river gums must be having a bit of a party.

Good that you & Loxton are high & dry John, feel for so many families that have lost their homes & many with flood damage, predictions with weather are very worrying at the moment.

Even though a lot of the jetties are now under water, Mannum still hasn't suffered any major flooding events yet, that will probably all change over the next 7 days. If we reach the predicted 170 gig/ltrs per day flow rate, our road in front of our house will be cut in a number of places and access to the workshop will require us to park on the hill behind our house.
If we see the 200 gig/ltrs per day that some are predicting, we will have water part way up our driveway at home, the levee in Mannum it self will be struggling, I expect the power will be cut off at the house and the road between Mannum and Murray Bridge will be cut .... that won't be a lot of fun at all .....

T1 Terry

200 gig/ltrs per day

Melbourne uses 1 giga litre a day. That's a lot of water flowing past Mannum.

jon_d wrote: ↑Fri Dec 02, 2022 3:38 pm

200 gig/ltrs per day

Melbourne uses 1 giga litre a day. That's a lot of water flowing past Mannum.

apparently the flow for the 1956 flood was 315 gig/ltr per day, but no idea how they measured that and giga litres weren't used back then ..... so .....
Still a lot of water and it will need a wide/deep river to get that to pass through each day.
When you consider Mannum is only 13 mtr above sea level, the water level will also need to be fairly high to get enough fall for that much water to actually move in 24 hrs

T1 Terry

There is actually an exacting scientific method of measuring the water flow. It's a bit complicated, but once the engineers can map the river contour at a given point, it's pretty simple.
I just hope that, given all the forwarning of what was to come, that nobody is harmed in this ongoing weather event.

A number of the shops that will be in the flood affected area have now emptied out their goods, it is getting towards crunch time it seems ..... yet the same water level has remained for two weeks now ..... not that I'm rushing to see the town flooded, but all the build up before the event seems to make it just that much longer we have waited.

Apparently they can't build a levee wall across the front of the "dry dock" so they have to build the levee around it. Because the houses along that area back onto the river .... as in fences already leading off into the water, they plan to continue the levee up the side of the road on the river side, blocking that side of the road completely. They are saying the base of the levee wall needs to be 7 mtrs, that's the gutter to the centreline, so the main street of Mannum will become a one way traffic zone with no parking through that section. There is a levee bank being built on the car parking road beside the Pretoria hotel so possibly that is the spot where the levee returns to the river bank.

T1 Terry