Is the Daly getting shallower?

Quiz FFF members on fishing and outdoors topics using the forum polling function

Is the Daly getting shallower?

Yes
11
52%
No
10
48%
 
Total votes: 21

User avatar
Matt Flynn
Site Administrator
Site Administrator
Posts: 13469
Joined: Thu Jan 01, 1970 10:00 am
Location: Somewhat Southerly
Contact:

Is the Daly getting shallower?

Post by Matt Flynn » Sun May 13, 2018 10:18 pm

Had a long-time Nats competitor tell me the Daly seemed to be getting shallower.

It is possible for this to happen, with land clearing. Or is the Daly the same as it ever was?



cuddlescooper
Jedi Seadog
Jedi Seadog
Posts: 3017
Joined: Sun Oct 31, 2010 2:53 pm
Location: Darwin

Re: Is the Daly getting shallower?

Post by cuddlescooper » Sun May 13, 2018 11:28 pm

No, every year is different and rivers will change with the season.

FITZY
Seadog
Seadog
Posts: 215
Joined: Mon Jan 16, 2012 10:06 am

Re: Is the Daly getting shallower?

Post by FITZY » Mon May 14, 2018 9:22 am

They havnt had rain down there for ages so its just the normal dry season height but it prett nasty on a low tide with all the logs etc

User avatar
Flickin4em
Jedi Seadog
Jedi Seadog
Posts: 671
Joined: Thu Dec 21, 2017 3:46 pm
Location: Humpty Doo NT.

Re: Is the Daly getting shallower?

Post by Flickin4em » Mon May 14, 2018 9:59 am

Yep... much wider too.

Could be part of a cycle or are we worsening the problem exponentially?

BANK EROSION FROM HIGH POWERED HEAVY BOATS AT RACE PACE PERHAPS ?...noooooo.. ????
Proudly supporting quality products by: LED Lenser, Lightforce, GoPro, Samsung, Lifeproof, Shimano, G.Loomis, Berkley, Owner, Rapala, Yozuri, Samaki, Storm, Zerek and Zman :)

User avatar
theodosius
Jedi Seadog
Jedi Seadog
Posts: 2635
Joined: Mon May 18, 2009 11:16 pm

Re: Is the Daly getting shallower?

Post by theodosius » Mon May 14, 2018 5:42 pm

I'd be surprised if bank erosion from boats was anything compared to a billions of litres of floodwater each year. Deforestation has to be having an effect though

User avatar
Flickin4em
Jedi Seadog
Jedi Seadog
Posts: 671
Joined: Thu Dec 21, 2017 3:46 pm
Location: Humpty Doo NT.

Re: Is the Daly getting shallower?

Post by Flickin4em » Tue May 15, 2018 4:03 am

What's your take on this situation ww.?
Proudly supporting quality products by: LED Lenser, Lightforce, GoPro, Samsung, Lifeproof, Shimano, G.Loomis, Berkley, Owner, Rapala, Yozuri, Samaki, Storm, Zerek and Zman :)

wonderwobler
Platinum Member
Platinum Member
Posts: 135
Joined: Mon Feb 11, 2008 12:39 am
Location: Daly River

Re: Is the Daly getting shallower?

Post by wonderwobler » Tue May 15, 2018 10:16 am

Changes in the environment have in the past been studied over a considerable time period, a knowledge base line is established and a consistent method of observation conducted. Conclusions are then made.

Our knowledge base line and methods of observation of the river don’t have these scientific factors. We are reliant on a mix of historic information and recent observation.

Firstly the historic information, the Daly River pioneers were serviced by boats from Darwin, there were a couple of wharfs established in the river, one near the Wooliana area and another closer to the old Robbie’s sand bar store where a railway from the Copper mine loaded out the ore for shipment to Darwin. This service continued until around the end of WW2. Large scale land clearing in the river catchment had not yet begun.

The vessels were large timber freighters, they undoubtedly moved in and out of the river on the tides, there is little information on these vessels or the schedules kept, the skill and the knowledge of the skippers and crew had to have been excellent to navigate the river, particularly during the dry season. However there is no mention of running aground or shipwrecks in the river.

The old method of sounding out water depth with a weighted rope to find channels was laborious and only documented in the vessels charts and for commercial reasons probably guarded information.

In recent times its only recreational vessels plying the river. The number of boats gradually increased over the past 20 year period along with the use of depth sounders, it’s reasonable to think that skippers don’t keep logs of river depths. They might remember changes in depth over small areas that they fish or navigation hazards that vary from year to year some of which end up on GPS memories.

Over time the river changes, particularly in the lower reaches where the tidal influence is conflicting with the outflow of the river, the delta is a dynamic area that experiences tidal pumping where sand is pushed into the river mouth and river outflows cut narrow channels that are rarely permanent.

The impacts we have on the river are probably understated, large scale land clearing, introduced hard footed animals and invasive weeds all contribute to negative changes in the river.
To think that waves that pound a river bank that evolved having never experienced waves over millenniums doesn’t have a negative impact on that river bank is an example of not only denial but stupidity.

On a scale of things my brief time on the river and observations of the river doesn’t carry any scientific credibility. However I do see change and have photos and videos of the river environment taken over 28 years that show that change.

Given that the volume of water coming and going out of the river is fairly stable, if it is getting shallower then the mathematics demand that the river must also be getting wider to accommodate that water, perhaps that’s why floods are occurring more frequently.

The causes and reasons don’t really matter to me and I believe that even if we were to take action and try and stop these changes the damage is done.

Do I think the river is getting shallower? Yes.

User avatar
Matt Flynn
Site Administrator
Site Administrator
Posts: 13469
Joined: Thu Jan 01, 1970 10:00 am
Location: Somewhat Southerly
Contact:

Re: Is the Daly getting shallower?

Post by Matt Flynn » Wed May 16, 2018 12:02 pm

281 views and only 11 votes, thought there would be more on here who have fished the Daly long enough to notice trends

User avatar
b-radical
Seadog
Seadog
Posts: 223
Joined: Tue Sep 27, 2016 10:38 am
Location: Wagaman

Re: Is the Daly getting shallower?

Post by b-radical » Thu May 17, 2018 12:06 pm

Only fished the daly 4 times (on boat dry season) so haven't seen it enough to know although can anyone vouch that the narrow parts are deeper and the wider stretches shallower??? just something i was told when i stayed at Wooliana a couple of years back
Everydays a good day when your fishing

FOMOB

User avatar
theodosius
Jedi Seadog
Jedi Seadog
Posts: 2635
Joined: Mon May 18, 2009 11:16 pm

Re: Is the Daly getting shallower?

Post by theodosius » Thu May 17, 2018 2:39 pm

Lucky some blokes put floats on the snags, looking shallow again this year at browns and a few other spots based on footage I've seen

cuddlescooper
Jedi Seadog
Jedi Seadog
Posts: 3017
Joined: Sun Oct 31, 2010 2:53 pm
Location: Darwin

Re: Is the Daly getting shallower?

Post by cuddlescooper » Sat May 19, 2018 12:44 am

A river that floods 14 plus meters of water through it every other year is gonna change. Even as a kid the river was full of timber, sandbars, rockbars ect and a boat over 4m with a 20hp was a dream boat. A river with such flow is gonna widen in parts and narrow in others. I fish upstream a bit and it doesnt see nearly the boat traffic of the down stream section and it has huge collapsed banks ect. I find it rich to believe that boat traffic is adversly affecting the banks. The river naturally meanders and sediments that are torn off one outside corner are deposited on the inside eddie of the next and the process and river evolution continues. Trees eventually grow on the sand bars on the inside bends while others collaps into the river on the outside bends ect

. I dont doubt that land clearing and bores upstream to grow water thirsty crops will have an effect on the springs during poor wets but while we are having decent wet seasons the current amount wouldnt have an effect this early in the season in my view as the water table should be high.

User avatar
STANDY
Jedi Seadog
Jedi Seadog
Posts: 1061
Joined: Tue Apr 26, 2011 1:38 pm
Location: Darwin

Re: Is the Daly getting shallower?

Post by STANDY » Sat May 19, 2018 9:22 pm

Funny as was in a boat a few years ago with a older guy that has a old chart plotter. Funny to see the change in the tracks used in the river on a 10 year old chart plotter ( low tide )

Rivers change and a few big wets can as above move corners profoundly.

Just lucky we have water unlike SA
A Fish in the Boat is Worth Five in the Shop.

wazdog
Seadog
Seadog
Posts: 213
Joined: Thu Nov 29, 2012 8:39 pm

Re: Is the Daly getting shallower?

Post by wazdog » Wed May 23, 2018 1:37 pm

You have only got to look at the mouth of Bamboo Creek, I has changed a lot in the last 5 years!!!

NinjaFish
Jedi Seadog
Jedi Seadog
Posts: 535
Joined: Sun Aug 27, 2017 8:50 am
Location: Darwin

Re: Is the Daly getting shallower?

Post by NinjaFish » Wed May 23, 2018 6:54 pm

Plenty of water in Browns Creek looking back towards the Daly (snuck in for a day between the comps)

At least parts that are noticeably shallower are sand build up - unless the rocks are rising too :D

Hull and skeg damage completed :|

:croc:
You do not have the required permissions to view the files attached to this post.

User avatar
b-radical
Seadog
Seadog
Posts: 223
Joined: Tue Sep 27, 2016 10:38 am
Location: Wagaman

Re: Is the Daly getting shallower?

Post by b-radical » Wed May 23, 2018 7:21 pm

Could have a game of golf on that island now plenty of green
Everydays a good day when your fishing

FOMOB

Post Reply

Return to “Fishing Polls”