USGS Water-Year Summary 2023

391825091285101 Vandalia

Cambrian-Ordovician aquifer system
Champlainian Series

LOCATION - Lat 39°18'25", long 91°28'50" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 SE 1/4 sec.05, T.52 N., R.5 W., Audrain County, MO, Hydrologic Unit 07110007,

REVISIONS HISTORY -
Revisions: Land-surface datum was updated to 761.58 ft NAVD88 on May 22, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published as 764 ft NAVD88 from topographic map. Discrete water-level measurements prior to May 22, 2023, are referenced to the original datum.

The record from 12/26/2007 to 11/16/2009 was modified after it was previously set to 'Approved' status. A -2.0 ft measuring point height correction was applied to this period of record to reference water levels to land surface instead of the measuring point which is referenced in the field.

GROUNDWATER RECORDS

DATUM - Land-surface datum is 761.58 ft above North American Vertical Datum of 1988. Measuring point: unknown, 2.0 ft above land-surface datum, Jan. 1, 1939 to present.  

PERIOD OF RECORD - December 26, 2007 to present. Gage was installed on December 20, 2007.

GAGE - December 26, 2007 to present; DCP with float, encoder, with telemetry capability were installed as the water level measuring and recording devices. Unit values begin December 26, 2007

COOPERATION - Data from December 20, 2007 to present, furnished by Missouri Department of Natural Resources (MDNR). Data processed by USGS and MDNR.

REMARKS - Data from December 26, 2007 to November 16, 2008 good based on 8 water level measurements made during this period to verify recorded water levels. The record from 11/17/2009 to 10/07/2010 is good based on 6 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 10/07/2010 to 10/05/2011 is good based on 5 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 10/05/2011 to 07/28/2012 is good based on 4 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 07/29/2012 to 07/30/2013 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 07/31/2013 to 01/20/2015 is good based on 3 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 01/21/2015 to 01/27/2016 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 01/28/2016 to 11/15/2016 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 11/16/2016 to 02/27/2018 is good based on 3 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record form 02/28/2018 to 09/04/2018 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 09/05/2018 to 04/24/2019 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. The record from 04/25/2019 to 09/22/2019 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.05 ft. 

All further remarks can be found in RMS as of 09/23/2019.