Cox's River (Kelpie Point) after rainfall

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Cox's River (Kelpie Point) after rainfall

Postby matt_h » Wed 05 Aug, 2020 10:22 am

Hi All,

Just wondering if anyone has an idea of the correlation between how many mm of rain the Blue Mts receives, and how much the Kelpie Point river depth gauge increases? I.e. if there's 20mm of rain in the area, how much would you expect the Cox's to increase.

Kelpie point is currently at 0.6m, with 20mm of rain forecast for Friday and 20mm on Saturday, or thereabouts, would this render it uncrossable on Sunday?

Also any insight on the same issue for the Nattai and the Wollondilly rivers is much appreciated!

Thanks in advance for any responses!
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Re: Cox's River (Kelpie Point) after rainfall

Postby Walk_fat boy_walk » Wed 05 Aug, 2020 11:36 am

matt_h wrote:Hi All,

Just wondering if anyone has an idea of the correlation between how many mm of rain the Blue Mts receives, and how much the Kelpie Point river depth gauge increases? I.e. if there's 20mm of rain in the area, how much would you expect the Cox's to increase.

Kelpie point is currently at 0.6m, with 20mm of rain forecast for Friday and 20mm on Saturday, or thereabouts, would this render it uncrossable on Sunday?

Also any insight on the same issue for the Nattai and the Wollondilly rivers is much appreciated!

Thanks in advance for any responses!

My recollection was that anything over half a meter or so at Kelpie would make the Cox uncrossable at either/both of Yellow Pup or Mt Cookem crossings? Nattai isn't uncrossable very often (can be though!) and drains pretty quickly after a flood but i'd be dubious about the Wollondilly after a lot of rain. In any case, if planning on doing Katoomba to Mittagong (which I've inferred from the post, might be wrong), I think large parts of the route remain closed from fires (eg. Scotts Main being part of Kanangra Boyd NP)? Could be wrong about that too.
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Re: Cox's River (Kelpie Point) after rainfall

Postby matt_h » Wed 05 Aug, 2020 1:23 pm

Thanks for that.

Looking at the topo maps, Scotts Main Mange is either entirely within Blue Mts NP, and then for about 5km north of the turnoff to Byrnes Gap, Scotts Main Range forms the border between Kanagara Boyd and Blue Mts. Doesn't seem to be part of KBNP though.
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Re: Cox's River (Kelpie Point) after rainfall

Postby michael_p » Wed 05 Aug, 2020 1:36 pm

BMNP stretches all the way to Wombeyan Caves road. This map may help in understanding the boundaries: https://www.nationalparks.nsw.gov.au/vi ... s-area/map
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Re: Cox's River (Kelpie Point) after rainfall

Postby FatCanyoner » Wed 05 Aug, 2020 1:58 pm

Yerranderie State Conservation Area, which covers the bit between Yerranderie and the Wollondilly River (where Nattai NP starts) remains closed. As does Yerranderie Regional Park, which covers the old township.

"This park is closed due to fire and flood damage. Do not enter this park." (See: https://www.nationalparks.nsw.gov.au/vi ... cal-alerts).

So there is no way to do the Katoomba to Mittagong route at the moment, even though large parts are open at either end.
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Re: Cox's River (Kelpie Point) after rainfall

Postby rcaffin » Wed 05 Aug, 2020 9:34 pm

I do remember trying to swim the Coxs River one time near Kelpie Point. It was kinda deep and fast at the time. We pulled back.

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