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#1486294 - 22/01/2019 07:47 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Simmo FNQ Offline
Weatherzone Addict

Registered: 08/08/2012
Posts: 2187
Loc: Mareeba
We just need that eastern low in the CS to bugger off then we will get rain. Hopefully it dissipates sooner rather than later.
_________________________
YTD 832.4mm
Daily
Yearly Stats

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#1486295 - 22/01/2019 07:54 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
slipperyfish Offline
Weatherzone Addict

Registered: 28/11/2011
Posts: 1470
Loc: South Mission Beach QLD
17mm overnight.

Will be in Cairns this weekend for a shindig, so it is sure to bucket down.

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#1486381 - 22/01/2019 22:54 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Ronfishes Offline
Weatherzone Addict

Registered: 25/02/2013
Posts: 3911
Loc: Gordonvale
Be good to get the MT close to us or just South so we can get some decent NW stormage smile
_________________________

MTD: 37.8mm
YTD: 1693.4mm
18-19 Wet Season: 2458.2mm

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#1486416 - 23/01/2019 11:35 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Simmo FNQ Offline
Weatherzone Addict

Registered: 08/08/2012
Posts: 2187
Loc: Mareeba
BoM upping their rainfall forecast again. If we receive the high total each day at my location it will be ~200mm from Friday - Tuesday. Fingers crossed!!!
_________________________
YTD 832.4mm
Daily
Yearly Stats

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#1486450 - 23/01/2019 16:25 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
WANDJINA G'vale Offline
Weatherzone Addict

Registered: 22/03/2006
Posts: 2525
Loc: Gordonvale - Qld
Has the potential to deliver - looking forward to it
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Wandjina - Cloud and rain spirits from Australian Aboriginal dreaming

Daisey Bates - The passing of the aborigines

YouTube - Coppertropicals - earthquake prediction

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#1486464 - 23/01/2019 17:38 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Ronfishes Offline
Weatherzone Addict

Registered: 25/02/2013
Posts: 3911
Loc: Gordonvale
Got a bit of liquid whipper snipper on, need to do a lot more but radar is fairly speckled.
_________________________

MTD: 37.8mm
YTD: 1693.4mm
18-19 Wet Season: 2458.2mm

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#1486482 - 23/01/2019 19:32 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
cold@28 Offline
Weatherzone Addict

Registered: 07/02/2011
Posts: 3036
Loc: Chillagoe
7mm so far this afternoon. grin

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#1486498 - 23/01/2019 20:55 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Ronfishes]
WANDJINA G'vale Offline
Weatherzone Addict

Registered: 22/03/2006
Posts: 2525
Loc: Gordonvale - Qld
Originally Posted By: Ronfishes
Got a bit of liquid whipper snipper on, need to do a lot more but radar is fairly speckled.


Needed you back posting so I could see the MTD lol
_________________________
Wandjina - Cloud and rain spirits from Australian Aboriginal dreaming

Daisey Bates - The passing of the aborigines

YouTube - Coppertropicals - earthquake prediction

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#1486507 - 23/01/2019 21:30 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: WANDJINA G'vale]
Hailin Offline
Weatherzone Addict

Registered: 27/12/2010
Posts: 1018
Loc: Moranbah/Glenella
Severe Weather Warning
for DAMAGING WINDS, HEAVY RAINFALL and ABNORMALLY HIGH TIDES
For people in parts of Peninsula Forecast District.
Issued at 4:24 pm Wednesday, 23 January 2019.
Monsoonal conditions set to develop across far north Queensland

Weather Situation: The monsoon trough is currently located across the northern coast of the Top End and is expected to strengthen over the northern Gulf of Carpentaria and far north Queensland into Thursday. A tropical low situated over northeast Gulf of Carpentaria waters is forecast to develop over the next few days and is currently rated a moderate (20-50%) chance of forming into a tropical cyclone from Friday.
Heavy rain, which may lead to flash flooding, is expected to develop across far north Queensland into Thursday. 6-hourly rainfall totals of 100 to 150mm are likely and locally heavier falls are possible with any thunderstorms.
Damaging winds, with peak gusts of around 90km/h, are possible about far north Queensland, including the Torres Strait Islands, from late Thursday.
Water levels on the high tide could exceed the highest tide of the year at some Torres Strait Islands on Thursday.
Locations which may be affected include the Torres Strait Islands, Bamaga, Old Mapoon, Weipa, Napranum, Lockhart River and Aurukun.

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#1486525 - 24/01/2019 08:01 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Hurricane force Offline
Weatherzone Addict

Registered: 31/01/2011
Posts: 4269
Loc: Cairns, Parramatta park.
20mm overnight.We should see some decent falls in the next few days.
_________________________
MTD: 41.0mm
YTD: 2435.2mm

June- 64.0mm

2014- 2352.6mm
2015- 2635.1mm
2016- 1495.7mm
2017- 2190.0mm
2018- 3551.9mm
________________________
"Some people feel the rain, others just get wetĒ

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#1486526 - 24/01/2019 08:13 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Simmo FNQ Offline
Weatherzone Addict

Registered: 08/08/2012
Posts: 2187
Loc: Mareeba
Getting excited now. BoM meteye upping the forecast again. Now ~250mm for Friday - Tuesday. Also models saying rain easing mid week then big falls again end of next week.

Tinaroo should spill on Monday/Tuesday if this weekends rain ends up falling. Bit worrying if we get another big rain event at the end of next week.

Question, I have been trying to find detailed information on why dams make flooding worse. Plenty of info saying dams do make flooding worse and some of the info says that once a dam is built people build on flood plains downstream. That does not explain why the floods are higher just that people are idiots.
Is it due to large inflows into the dam being displaced over the area of the dam but once it gets to the narrow spillway again there is a larger volume of water needing to spill out?
_________________________
YTD 832.4mm
Daily
Yearly Stats

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#1486531 - 24/01/2019 08:51 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: WANDJINA G'vale]
Ronfishes Offline
Weatherzone Addict

Registered: 25/02/2013
Posts: 3911
Loc: Gordonvale
Originally Posted By: WANDJINA G'vale
Originally Posted By: Ronfishes
Got a bit of liquid whipper snipper on, need to do a lot more but radar is fairly speckled.


Needed you back posting so I could see the MTD lol


I would add 10%+ for your place
_________________________

MTD: 37.8mm
YTD: 1693.4mm
18-19 Wet Season: 2458.2mm

Top
#1486533 - 24/01/2019 09:06 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Simmo FNQ]
Ronfishes Offline
Weatherzone Addict

Registered: 25/02/2013
Posts: 3911
Loc: Gordonvale
Originally Posted By: Simmo FNQ
Getting excited now. BoM meteye upping the forecast again. Now ~250mm for Friday - Tuesday. Also models saying rain easing mid week then big falls again end of next week.

Tinaroo should spill on Monday/Tuesday if this weekends rain ends up falling. Bit worrying if we get another big rain event at the end of next week.

Question, I have been trying to find detailed information on why dams make flooding worse. Plenty of info saying dams do make flooding worse and some of the info says that once a dam is built people build on flood plains downstream. That does not explain why the floods are higher just that people are idiots.
Is it due to large inflows into the dam being displaced over the area of the dam but once it gets to the narrow spillway again there is a larger volume of water needing to spill out?


Can't see how a dam can make flooding worse unless water is diverted from another catchment that doesn't normally flow that way. I'm no hydrologist, but my thinking is peak flows would be lessened (that level of water is held back over a much larger area) but higher flows will last a little longer. Imagine the Barron falls last month if all that water that was flowing into Tinaroo was going down at the same time as the downstream flow - that would have been a sight!

Anyways only 7.8mm last 2 days
_________________________

MTD: 37.8mm
YTD: 1693.4mm
18-19 Wet Season: 2458.2mm

Top
#1486538 - 24/01/2019 09:28 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Simmo FNQ Offline
Weatherzone Addict

Registered: 08/08/2012
Posts: 2187
Loc: Mareeba
Thats what I thought too RF.
One article I just read said that the flooding peak is reduced due to water being held up in the dam but the flood period is extended.
But is also said that if a second large rainfall event occurs shortly after the first, when all the water from the first rainfall event is still held up and slowly making its way out of the dam, that can make the flood worse.

So because of the extended flood period due to the dam, to get another flood during that period would make that second flood a lot worse. Where if there had been no dam all that water would have already made its way through the river system.

Obviously this is when the dam is over 100% by the end of the first rain event.



Edited by Simmo FNQ (24/01/2019 09:37)
_________________________
YTD 832.4mm
Daily
Yearly Stats

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#1486539 - 24/01/2019 09:38 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Simmo FNQ]
Weary Offline
Weatherzone Addict

Registered: 07/03/2014
Posts: 1185
Loc: Edge Hill, Cairns
Originally Posted By: Simmo FNQ
Getting excited now. BoM meteye upping the forecast again. Now ~250mm for Friday - Tuesday. Also models saying rain easing mid week then big falls again end of next week.

Tinaroo should spill on Monday/Tuesday if this weekends rain ends up falling. Bit worrying if we get another big rain event at the end of next week.

Question, I have been trying to find detailed information on why dams make flooding worse. Plenty of info saying dams do make flooding worse and some of the info says that once a dam is built people build on flood plains downstream. That does not explain why the floods are higher just that people are idiots.
Is it due to large inflows into the dam being displaced over the area of the dam but once it gets to the narrow spillway again there is a larger volume of water needing to spill out?

Canít find it because dams donít make flooding worse?
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Love petrichor

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#1486544 - 24/01/2019 10:23 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Simmo FNQ Offline
Weatherzone Addict

Registered: 08/08/2012
Posts: 2187
Loc: Mareeba
Have found a bit of info on google scholar.

"Dam managers also often have a remit to guard against flooding downstream by capturing the flood flows of rivers. During moderate floods this usually works well. But in times of very high rainfall and exceptional river flows, the dam's very capacity to capture water becomes a menace. As the reservoir becomes full, its operators are faced with the choice of risking the catastrophic failure of their dam as it overfills, or of making emergency releases of water down spillways. Anxious not to cause downstream flooding, they often leave it too late to make the fateful decision. The result is emergency releases that are far greater and more sudden than flows that would have occurred during the natural river flooding."

"Dams are often designed on the basis of a very poor knowledge about the long-term hydrology of the rivers they block. There is little historical data on rainfall or river flows in much of the world. Hydrologists know little about the potential for extreme flood events. And where there is data, it may not accurately reflect current risks.
River catchments that have been deforested or cleared of scrub, or where their wetlands have been drained, develop very different hydrological regimes. The loss of these natural sponges for floodwaters within the catchment increases the risk of extreme floods."


There is also a few interesting articles on the 2011 Brisbane floods which was a result of 2 flood peaks entering the dam.

"Two distinct flood peaks entered Wivenhoe Dam during the flood event. The first flood into Wivenhoe Dam was similar in nature and magnitude to the comparable flood flows of the January 1974 event. The combined mitigation effect of Somerset and Wivenhoe Dams ensured that this first flood did not result in urban damage below Moggill (some 20 km upstream from Brisbane CBD), however achieving this result did cause significant filling of the damsí flood storage compartments. The second flood was also similar in nature and magnitude to the comparable flood flows of the January 1974 event. The flood compartments of the dams were filled to a high level by the first flood and there was not sufficient time to release this water prior to the second flood arriving. Accordingly, the second flood could not be completely contained without risking the safety of the dams. The resulting inflow of water into the Brisbane River, combined with floodwaters from Lockyer Creek, the Bremer River and the Lower Brisbane River resulted in significant urban damage. However, the extent of this damage was greatly reduced by the operation of the dams."


Edited by Simmo FNQ (24/01/2019 10:26)
_________________________
YTD 832.4mm
Daily
Yearly Stats

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#1486548 - 24/01/2019 10:33 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Simmo FNQ Offline
Weatherzone Addict

Registered: 08/08/2012
Posts: 2187
Loc: Mareeba
The bit about the Brisbane flood was a Seqwater report quoted in this paper if anyone is interested.

https://www.mdpi.com/2073-4441/3/4/1149/htm


Anyways that has killed some time waiting for the rains. Hahaha. What to do with the rest of the day.
_________________________
YTD 832.4mm
Daily
Yearly Stats

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#1486554 - 24/01/2019 10:53 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
slipperyfish Offline
Weatherzone Addict

Registered: 28/11/2011
Posts: 1470
Loc: South Mission Beach QLD
22mm down here. A mild morning, very gentle breeze

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#1486574 - 24/01/2019 13:35 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
scott12 Offline
Weatherzone Addict

Registered: 10/11/2015
Posts: 1231
Loc: maadi Tully area

We had flash flooding last night and had to wait an hour for the creek to recede enough for the boy to wade across to get home...

Gauge fell over but there must have been 5-6 inches over a couple of hours in the evening...


Lots more to come n coming days by all reports...

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#1486585 - 24/01/2019 14:03 Re: Far North Queensland Wet Season - Cardwell Northwards - January 2019 [Re: Raindammit]
Simmo FNQ Offline
Weatherzone Addict

Registered: 08/08/2012
Posts: 2187
Loc: Mareeba
Welcome back Scott. Been missing the Tully reports.
_________________________
YTD 832.4mm
Daily
Yearly Stats

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