USGS Water-Year Summary 2023

373905091071001 VIBURNUM TREND WELL 2

Ozark Plateaus aquifer system
Eminence-Potosi Dolomites

LOCATION - Lat 37°39'06.0", long 91°07'10.7" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 SE 1/4 sec.11, T.34 N., R.2 W., Iron County, MO, Hydrologic Unit 07140102, approximately 0.4 mile south of Highway 32 on road to Magmont Mine near Bixby.

REVISIONS HISTORY - The period 04/02/2008 to 09/30/2008 was revised after it was previously approved. A prorated correction from zero to +0.05 ft applied from 04/02/2008 to 02/20/2009 was removed when it was discovered the water level measurement made on 04/02/2008 was in error. Removing this correction affected the record by making no changed on 04/02/2008 and gradually increasing the depth to water by 0.03 ft on 09/30/2008. A prorated correction from zero to -0.09 ft was removed from the period 04/12/2010 to 08/10/2010 after this period was previously set to 'APPROVED'. Later site visit showed a -0.09 ft reset on 08/10/2010 was negated with a +0.08 ft reset on 11/01/2010. Because the measuring device is a float and encoder it is likely the 04/12/2010 reset was not necessary caused by an uncalibrated electric tape. This is more pausible than a float and encoder having instrument drift problems. The period 04/02/2008 to 09/30/2008 was revised after it was previously approved. A prorated correction from zero to +0.05 ft applied from 04/02/2008 to 02/20/2009 was removed when it was discovered the water level measurement made on 04/02/2008 was in error. Removing this correction affected the record by making no changed on 04/02/2008 and gradually increasing the depth to water by 0.03 ft on 09/30/2008. A prorated correction from zero to -0.09 ft was removed from the period 04/12/2010 to 08/10/2010 after this period was previously set to 'APPROVED'. Later site visit showed a -0.09 ft reset on 08/10/2010 was negated with a +0.08 ft reset on 11/01/2010. Because the measuring device is a float and encoder it is likely the 04/12/2010 reset was not necessary caused by an uncalibrated electric tape. This is more pausible than a float and encoder having instrument drift problems.

GROUNDWATER RECORDS

DATUM - Land-surface datum is 1,420 ft above National Geodetic Vertical Datum of 1929. Measuring point: DNR took ownership of well and installed real time capabilities; new gage house, 2.4 ft above land-surface datum, May 23, 2007 to present. Land surface altitude is 1,420 feet above National Geodetic Vertical Datum of 1929, from topographic map and is considered to be accurate to +/- 10 feet. From December 13, 2001 to May 29, 2007, measuring point was top of steel casing 2.1 feet above land surface. From May 30, 2007 to present--measuring point is 2.4 ft above land surface.

PERIOD OF RECORD - February 13, 2002 to present.

GAGE - From February 13, 2002 to May 04, 2005 water level and temperature field data were collected and stored by a vented, DH-21 submersible pressure transducer with data logger. Since May 04, 2005 water level and temperature field data are collected and stored in Solinst Levellogger which is compensated for barometric pressure changes by a Barologger housed at the Fletcher Mine tailings or beginning December 1, 2005 at Winona to improve its accuracy. The equipment at the well is housed in a 9 in X 9 in steel protective casing. From May 30, 2007 to present, the water level measuring device is a float and encoder and the water level recording device is DCP with telemetry capability.

REMARKS - The water-level record is rated good and is considered to be accurate within +/- 0.3 ft for the 2006 water year. There were 12 days of missing record that include the periods Jan 8-11 and Sept 7-14. The Missouri Department of Natural Resources took over ownership of the well in May 2007 and uses the well for their ground water network. The record from May 30, 2007 to September 30, 2008 is good based on 7 water level measurements made during the period to verify the data and is accurate to +/- 0.1 ft. The record from October 1, 2008 to March 29, 2010 is good based on 10 water level measurements made during the period to verify the data and is accurate to +/- 0.1 ft. The record from 03/29/2010 to 08/10/2010 is good based on 3 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.1 ft. The record from 08/10/2010 to 07/19/2011 is good based on 6 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.1 ft, except for the period 04/01/2011 to 06/02/2011 which is accurate to +/- 0.2 ft. The float has a tendency to stick in the well causing the hydrograph to 'jump' when the float becomes free. Sometimes these jumps can be considerable and these data are deleted. On 06/02/2011, 10 feet of cable was removed to try to correct this problem. The record from 07/20/2011 to 09/30/2012 is good based on 4 water level measurments made during the period to verify the recorded data and is accurate to +/- 0.1 ft. The record from 10/01/2012 to 09/17/2013 is good based on 4 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. The record from 09/18/2013 to 09/08/2014 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. The record from 09/09/2014 to 06/08/2016 is fair based on 5 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. The record form 06/09/2016 to 03/01/2017 is good based on 4 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft.