Tag Archives: subsidence

Withlacoochee and Suwannee paddle: springs, shoals, and pipeline 21 Sept 2014

Update 20 September 2014: Now with a lunch stop at Chris and Deanna’s house! Bring your own lunch or snacks, but the Mericles have picnic tables and bathrooms. Chris reports the Withlacoochee is high enough that the shoals are no problem, and the weather report says clear all day tomorrow. See also his report on FERC and Sabal Trail’s recent visit to this same area and what Sabal Trail wrote to FERC the next day.

Sabal Trail may be thinking of moving their pipeline, but WWALS is still padding past the original location 10AM Sunday September 21st. All are invited to come see for themselves the springs, shoals, and sinkholes that we value more highly than pipeline profit for a company from Houston. Join us for a fine day on two of our fabulous southern blackwater rivers: the Withlacoochee River and the Suwannee River, in Hamilton and Suwannee Counties, Florida.

The meeting place is the CR 143 Boat Ramp on the Withlacoochee River near Jennings, Florida. For directions, please see the earlier post about this outing.

This event is FREE! All we ask is Continue reading →

Videos: Aquifers, sinkholes, and groundscans –Prof. Don Thieme

We had to move to a larger room, so many attended this groundwater talk at VSU (about 90). Plus a guest appearance by SAVE.

Crowded small room Larger Magnolia Room

Coastal Plain Surficial Deposits, Groundwater Resources, and Recent Subsidence in south Georgia by Prof. Donald M. Thieme @ VSU for WWALS 2013-10-09 Here are Dr. Donald M. Thieme‘s slides in PDF, with his longer title:

Coastal Plain Surficial Deposits, Groundwater Resources, and Recent Subsidence in south Georgia

While we are lucky to have abundant groundwater, both from the Upper Floridan Aquifer 100 feet below us trapped in Eocene limestones and from shallow groundwater with its karst features, nonetheless overpumping has caused falls in the level of the aquifer (about 0.6 feet a year at Valdosta), resulting in rapid loss of shallow groundwater, plus surface water that enters and often contaminates the aquifer through those karst features.

Summary: abundant groundwater from Upper Floridan aquifer and shallow groundwater Summary: Fall in level of upper Floridan aquifer is primary cause for....

Sometimes those karst features subside and manifest as sinkholes like the one that ate Snake Nation Road in Lowndes County and others that can develop slow (many years) or fast (weeks or minutes).

Subsidence Problems in south Georgia and north Florida Snake Nation Road sinkhole

There were also many questions, starting with what water do personal wells reach? Also including a brief history of Valdosta well drilling from artesian to hundreds of feet down, and a sinkhole in a garage in Lowndes County, should local governments require sinkhole insurance (including mention of Moody AFB subsidence and Florida citrus growers pumping so much water it causes sinkholes). I also introduced the WWALS board members present: Gretchen Quarterman (Treasurer and videoing), Bret Wagenhorst (Outings), Heather Brasell (Secretary), Dave Hetzel (President), April Huntley (Director), me (Vice President), and Chris Graham (Member); plus a brief summary of WWALS events and outings. Here’s a video playlist:

Continue reading →

Now at VSU: Aquifers, sinkholes, and ground scans –Don Thieme @ WWALS

Update 2019-04-02: Videos.

Moved to VSU, University Center, Dogwood Room! Prof. Don Thieme of VSU will speak about underground water issues at the October WWALS board meeting in Wednesday October 9th at 7:30 PM in Valdosta. Join the facebook event or come as you are.

Here’s the letter Prof. Thieme and two other VSU professors wrote to the Air Force about sinkholes and subsidence on the proposed Moody Family Housing in Lowndes County, which also turns out to be in an aquifer recharge zone.

Here’s VSU’s campus map and here’s a google map: Continue reading →

Aquifers, sinkholes, and ground scans –Don Thieme @ WWALS

Moved to VSU, University Center, Dogwood Room!
Prof. Don Thieme of VSU will speak about underground water issues at the October WWALS board meeting in Wednesday October 9th at 7:30 PM in Adel at the IHOP, 1200 W 4th Street. Valdosta.

Here’s the letter Prof. Thieme and two other VSU professors wrote to the Air Force about sinkholes and subsidence on the proposed Moody Family Housing in Lowndes County, which also turns out to be in an aquifer recharge zone.

It’s an open board meeting anyone can attend for the business part, as well. Here’s the agenda:

Agenda WWALS Board Meeting
7:30 pm October 9, 2013
IHOP, Adel GA
  1. Call to Order, Welcome and Introductions
  2. Speaker: Don Thieme, VSU geologist. Topic: Aquifers, sinkholes, and ground scans.
  3. Agenda Review: Additions and Changes
  4. Review and Approval of Minutes of September Board Meeting
  5. Future Meetings and Events
    1. Monthly outing (fourth Saturday): October 26, 2013 at Banks Lake near Lakeland.
    2. Monthly board meeting (second Wednesday): November 13 Continue reading →