tag:blogger.com,1999:blog-5388608827926699865.post1438054679506385867..comments2023-12-27T11:53:19.572+11:00Comments on Northern Rivers Geology: Where Does the Groundwater Flow?Rodhttp://www.blogger.com/profile/10962789743908134314noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-5388608827926699865.post-14919442794514232502014-04-14T20:35:06.323+10:002014-04-14T20:35:06.323+10:00More blogs on groundwater coming up.More blogs on groundwater coming up.Rodhttps://www.blogger.com/profile/10962789743908134314noreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-25058969749055628422014-04-14T19:57:21.496+10:002014-04-14T19:57:21.496+10:00Hi Rod,
Yes, I was only refering to near coastal ...Hi Rod,<br /><br />Yes, I was only refering to near coastal environments and thanks Rod for your informative answer. Underground water really does work in mysterious ways. <br /><br />I seem to remember concerns regarding the Botany Bay industrial centre and down-gradient groundwater supplies and they found that the water was actually not contaminated due natural filtration.<br /><br />More blogs on groundwater? yes please!Dylanhttps://www.blogger.com/profile/06632657395095391104noreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-20791991234981392402014-04-14T18:52:56.738+10:002014-04-14T18:52:56.738+10:00Hi Dylan,
Although the issue of sea water getting...Hi Dylan,<br /><br />Although the issue of sea water getting into groundwater is certainly legitimate, be careful not to visualize groundwater as a lake. Bores will have a cone of draw-down this means that the water level in bore part of the aquifer though connected to another is actually lower than the rest of the aquifer. <br /><br />An issue with salt wedge development arises when multiple bores are over extracted and recharge is limited. This usually takes some time. Because the transmissivity in a lot of the coastal sands is within certain limits and because the aquifer volume is usually high the problems with salt wedges is probably limited. <br /><br />It is also more of a problem closer to the coast. For example draw down in a coastal zone may cause salt wedge issues whereas the same draw down further inland is unlikely to cause measurable salt water transmission.<br /><br />I think this issue probably requires a few future blog posts.Rodhttps://www.blogger.com/profile/10962789743908134314noreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-7588361380934014622014-04-14T13:13:25.108+10:002014-04-14T13:13:25.108+10:00Hi Rod,
I remember a time at Suffolk Park when th...Hi Rod,<br /><br />I remember a time at Suffolk Park when there were severe water restrictions and anyone who didn't have access to bore water basically had a dead lawn and those who did had to put a sign up to save council having to check whether water was being used illegally. Many questions were raised by concerned/jealous neighbours about its use. One person claimed that for every metre the fresh water table was lowered, salt water would move inland up to six metres. <br /><br />Is there any merit to this?<br /><br />On another note; being a surfer, it is common to see fresh water coming through the sand, particularly at low tide. This fresh meeting salt is often where pipis proliferate.Dylanhttps://www.blogger.com/profile/06632657395095391104noreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-80473555162664668692014-04-10T07:17:16.734+10:002014-04-10T07:17:16.734+10:00Hi Nick,
There are already some groundwater suppl...Hi Nick,<br /><br />There are already some groundwater supply bores in the Woodburn Sands and Alstonville Plateau (as well as numerous private bores). I understand that the new Coastal Sands Water Sharing Plan to be released by the state government in a few months has a sizable allocation for drinking water supply too. The Woodburn Sands are generally regarded as having more capacity to develop without affecting discharge (too much).<br /><br />The Alstonville Plateau groundwater sources are over allocated and during droughts they are severely drawn down.<br /><br />I'm afraid that I'm not in a position to say much more about the allocation of groundwater sources of the area. However, there will me more said in the near future assuming the outcome of the future water strategy and other investigations that are ongoing.Rodhttps://www.blogger.com/profile/10962789743908134314noreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-62008542453242555392014-04-10T07:09:41.766+10:002014-04-10T07:09:41.766+10:00That sounds like a very good example of how import...That sounds like a very good example of how important groundwater discharge areas are. I wonder if there are many groundwater bores in your area that tap that aquifer.Rodhttps://www.blogger.com/profile/10962789743908134314noreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-9215804351551163922014-04-10T07:04:07.632+10:002014-04-10T07:04:07.632+10:00Hi Dylan,
I know it is funny. Santos is actually ...Hi Dylan,<br /><br />I know it is funny. Santos is actually a SCU academic at the moment. He has told me exactly the same irony.<br /><br />Although the research was in the gulf of Mexico he is actually from Brazil. Even the northern rivers seems to be connected with the rest of the world these days.Rodhttps://www.blogger.com/profile/10962789743908134314noreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-53251456764398586932014-04-09T21:46:06.653+10:002014-04-09T21:46:06.653+10:00Fascinating issue, fascinating processes. Have the...Fascinating issue, fascinating processes. Have there been any plans to tap the Woodburn Sands? What about groundwater resources in places like the Alstonville Plateau? Are there any detailed assessments of that area, water quality, inputs and extraction?<br /><br />Over the border there is a bit of conflict on Tamborine Mountain and other plateaus with local residents vs others who are pumping water for sale off mountain; private bores used on property vs simple water extraction and removal from the mountain. Lots of bores sunk there over many decades, must be hard to keep a handle on such use. Apparently, Tamborine is not really well assessed for sustainable yield, and is not formally gazetted as an aquifer by the relevant department. Love to read your opinion on this.Nickhttps://www.blogger.com/profile/09537772941984056434noreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-55156304180599413302014-04-09T19:37:38.754+10:002014-04-09T19:37:38.754+10:00Very interesting post, Rod. There is a place in Wa...Very interesting post, Rod. There is a place in Wangi where ground water comes to the surface beside the lake here. It was the first fresh water supply for settlers here - and for the Aborigines long before that.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5388608827926699865.post-54115189063064961252014-04-09T11:54:48.620+10:002014-04-09T11:54:48.620+10:00Interesting little post Rod,
the reference is quit...Interesting little post Rod,<br />the reference is quite amusing too, as most people from the Northern Rivers will think you have refered to a gas company rather than a Mexican scientist. lolDylanhttps://www.blogger.com/profile/06632657395095391104noreply@blogger.com