Blocked fish ladders Napean River

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Beardypaul
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Blocked fish ladders Napean River

#1 Post by Beardypaul » Mon Sep 19, 2016 11:10 am

After a first bass trip for the new season, we found massive soil erosion down behind Camden . Thousands of tons of soil has moved, leaving trees at right angles or in the water. This may give the fish new ambush locations, but the soil has blocked the fish ladder, Conan told me last week that the next ladder down stream is also blocked. I have reported this to the SCA's incident response line 1800 061 069. The young lady took my details and will have to boys look into it. Last time this occurred it took them about two weeks to clear 22 ton of sand out of that particular ladder. Here's hopping they can do the same this time, As we know the fish are now starting to migrate up stream, and without the fish ladders in operation it could be a skinny year for bass fishing.
So please report any blocked ladders you come across in the Nepean River to the SCA's incident line 1800 061 069. it's doing our part to keep the fishery healthy.

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bass bash
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Re: Blocked fish ladders Napean River

#2 Post by bass bash » Mon Sep 19, 2016 5:44 pm

Paul we at the club (WBC)reported the blocked weir to SCA about 6 weeks ago. They said they knew of the blocked weirs and a contractor would be onto it soon.
I think it will be a tough season on the upper Nepean as Brownlow loop weir is totlly covered with sand and Theresa park weir is full of sand and rocks and rumour has it the track to theresa park weir is gone.
brownlow loop.JPG
Brownlow loop yesterday
phpiqPejsPM.jpg
phpjzBpa0PM.jpg
Theresa park Saturday no fish migration up theses two, Theresa park is totally blocked 3/4 the way down
Jeff
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Beardypaul
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Re: Blocked fish ladders Napean River

#3 Post by Beardypaul » Mon Sep 19, 2016 8:03 pm

Thanks for the pictures Bass bash, the SCA was in phone contact with me this afternoon, they informed me that work has already begun on some of the fish ladders. It may be a case of a small work force for a big job. Please keep in touch with the SCA incident line, and even post it here. I forgot to photograph the ladder I have concerns with. So your photos will help. If we don't let them know, they can not be get it fixed. keep up the good work.

pjmowens
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Re: Blocked fish ladders Napean River

#4 Post by pjmowens » Thu Sep 22, 2016 7:49 am

Was planning on a fish this morning but seems I may wait!

Please keep us posted of any changes

Thanks Pat

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Beardypaul
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Re: Blocked fish ladders Napean River

#5 Post by Beardypaul » Mon Oct 31, 2016 11:29 am

I went out to check the weir this morning, the water was going over the
weir. However the flow through the fish ladder was restricted in the top
three chambers by dead tree branches and leaf matter. The water level
was above the top of the two vertical slots that feed the upper chamber,
however only the bottom slot was operating, and at a reduced flow. About
equivalent to what you would expect to get out of your house down pipe
in a storm. not enough for fish to migrate. I took some photos including
the numbers on the badges attached to the fish ladder for ID. I noted
that the level sensing control box was also damaged, so took a photo of
that also. This may explain as to why others are not aware of the flow
problem.
I suspect that who ever controls the ladders would be sensing the water
level and flow rate remotely. As it would only take two sensors to
achieve this, a flow rate sensor measuring the flow rate over the entire
fish ladder. Plus a depth gauge sensor at the weir, then it would be
simple maths, to program a PLC unit to send the data remotely to a
monitoring point any were on the planet.
Knowing what the flow rate should be at any depth, if the rate is less
than 50% of what is expected an alarm could be generated to the
monitoring station, allowing for a maintenance crew to attend.
Well that's how I would rig it up. But at present the control box looks
a little worse for ware. Don't know if it is vandalised, or storm damage
but it needs fixing. I have report it to the above phone number.

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arpie
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Re: Blocked fish ladders Napean River

#6 Post by arpie » Mon Oct 31, 2016 10:31 pm

Gee, that's a shame they get blocked up! :cry: Sounds like a rethink of the design should be in order if it happens on a regular basis.

Roberta
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Beardypaul
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Re: Blocked fish ladders Napean River

#7 Post by Beardypaul » Tue Nov 01, 2016 10:29 am

Yes Roberta it's getting worse , as the Government wants to double the population in the rivers catchment area. This means what was cow paddocks, turf farms and vine yards, is quickly becoming industrial and housing estates. No open soil to absorb the rain . Sadly the river will probably become a glorified storm water drain in the next ten years, as the fast run off from the hard surfaces will lead to flash flooding. Some people call it progress, I think it sad that our kids will not enjoy the asset we have grown up with.
I'm having problems attaching photos to this site, any tips on how its done would be appreciated.

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arpie
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Re: Blocked fish ladders Napean River

#8 Post by arpie » Tue Nov 01, 2016 12:25 pm

....it sad that our kids will not enjoy the asset we have grown up with. ....
Shame! I've only seen 'simple' fish ladders in smaller streams ..... and they seem to work OK ...... even after big rain events.

...I'm having problems attaching photos to this site, any tips on how its done would be appreciated..
Re pics ..... just keep them about postcard size (up to 150kb) and just click on Upload Attachment, choose the pic from your source, then click 'add the file'. If you then click 'preview' whilst it is loading, the pic will show in a preview of your writeup, at the bottom.

If you want to place them in specific spots in your write up - just put the cursor where you want each one & click on each pic to put it there

Good luck

cheers

Roberta

Any pics bigger than 150kb can be a problem - and that is 'big enough' for most to see everything clearly
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Beardypaul
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Re: Blocked fish ladders Napean River

#9 Post by Beardypaul » Tue Nov 01, 2016 12:57 pm

Contacted by Water NSW this is the new name for Sydney Catchment Authority, looks like they are being made ready for privatisation. Wonder which country will by that asset. Back to the point, a nice bloke called Kirk contacted me, to explain Water NSW has a limited budget, along with limited assets. Asset = staff in new management speak. There has been structural damage to one of the weirs, with bad bank erosion. As this has potential to further collapse allowing the river to bypass the end of the weir. All their assets are presently involved in the big repair. Sydney Water estimate that it will take 3 to 4 months to complete repairs on the main job, then the fish ladders will be serviced. So, its just going to be a tight season for the Nepean river.

Ozzybass
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Re: Blocked fish ladders Napean River

#10 Post by Ozzybass » Wed Nov 02, 2016 12:07 am

Thanks for the info Beardypaul. Which weir is damaged and causing all this use of "resources" & "assets"?

clutch
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Re: Blocked fish ladders Napean River

#11 Post by clutch » Wed Nov 02, 2016 10:13 am

Thanks for the update. What a circus!!!
YAK PBs... Flathead 75 cm, Silver Trevally 55 cm, Tailor 50 cm, Australian Salmon 50 cm, Wild Bass 44 cm, Bream 32 cm, Estuary Perch 32 cm, one squid, one pike

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bass bash
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Re: Blocked fish ladders Napean River

#12 Post by bass bash » Wed Nov 02, 2016 5:29 pm

Slow season in the upper Nepean :cry: :cry:
Jeff

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johnnyk15
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Re: Blocked fish ladders Napean River

#13 Post by johnnyk15 » Wed Nov 02, 2016 7:05 pm

I'm from Camden is it still worth trying to fish hoping for a decent sized one that for
Some reason didn't go to spawn or am I better either traveling to another system or fishing towards Penrith?

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Beardypaul
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Re: Blocked fish ladders Napean River

#14 Post by Beardypaul » Thu Nov 03, 2016 7:49 am

Not told which weir has the big damage, I know they look after 15 of them. But I can tell you it's not the one behind Camden airport. If any one sees a lot of construction equipment near their local weir, that will be it. Drop a post and let every one know, because just below that weir could be some good fishing.

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johnnyk15
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Re: Blocked fish ladders Napean River

#15 Post by johnnyk15 » Tue Nov 15, 2016 7:53 pm

hey all

has anyone got any news on the fish ladders ?

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