Comments on: Chart of Lanier’s Level compared to last year

By: AJC posts conservation article with a nice chart | Atlanta Water Shortage

AJC posts conservation article with a nice chart | Atlanta Water Shortage — Sun, 06 Apr 2008 13:54:39 +0000

[...] The AJC has an article in today’s paper that discusses how much people have cut back to help conserve water in the metro area. It’s a pretty good article, looking at both conversation and current restrictions. The online version doesn’t include it, but there is a chart in the paper (page C8) which I’ve included a photo of. Does it look familiar? [...]

By: Monthly chart of Lanier’s Level | Atlanta Water Shortage

Monthly chart of Lanier’s Level | Atlanta Water Shortage — Tue, 01 Apr 2008 14:41:39 +0000

[...] up on the chart we did last month, here is a look at Lanier’s level updated for this [...]

By: mickey

mickey — Fri, 07 Mar 2008 18:14:02 +0000

chriss — this?

http://www.atlantawatershortage.com/20071112/some-insight-into-the-vertical-layout-of-lanier/

By: chriss

chriss — Fri, 07 Mar 2008 18:11:46 +0000

Regarding the volume of Lanier, I remember seeing a graph on this blog months ago which plotted the elevation on Lanier as it initially filled up, in the 1950s. If you assume a constant flow into the lake back then, you could calculate the volume at elevation by integrating over that graph.

I can’t find a link to that article, but I know it was on this site.

By: Chicken Little

Chicken Little — Wed, 05 Mar 2008 19:38:01 +0000

I concur!

By: RichS

RichS — Wed, 05 Mar 2008 14:56:24 +0000

On a good note, yesterday’s rain brought us half a foot of rise. Very nice gain. Sadly, we were losing that much every three or four days last fall so it will take a bunch of these rains to get us back where we need to be. At least it’s nice to see a real gain finally though.

By: Andrew S.

Andrew S. — Tue, 04 Mar 2008 21:19:22 +0000

As far as I know the surface area to volume function for Lake Lanier is not known, or at least, hasn’t been in any place I could find it. I was thinking that maybe you might be able to get some of it by calculating the inputs and outputs as the lake goes up and down. Inputs = rainfall and watershed area, outputs = evaporation and releases. If you knew how much was let out, you might be able to get an idea from the pseudo-linear portion from August to December of last year.

By: RichS

RichS — Tue, 04 Mar 2008 21:06:38 +0000

Sorry, I meant to post this link to the data above -
http://water.sam.usace.army.mil/gage/acf/prob2.txt

By: RichS

RichS — Tue, 04 Mar 2008 21:06:10 +0000

Does anyone know or have a good guess why the rate of discharge almost doubled around the end of February and continues at that pace?

By: mickey

mickey — Tue, 04 Mar 2008 20:39:30 +0000

Rick,

I considered that, but it leads to another problem. Right now, the chart only shows a zone of 25 feet. If I included the bottom of the lake in there, the chart would show a total zone of about 150 feet. That would make the lines much closer to straight horizontal, which would give much less impact.

If you want to see it other ways, I would suggest:

- Take the data:
http://water.sam.usace.army.mil/gage/bufelev.htm
- Build some of your own:
http://nces.ed.gov/nceskids/createagraph/
- Post your results in the forum:
http://www.atlantawatershortage.com/forums/

If you (or anyone else) post some great ones, I’ll showcase them here in the blog.