USGS Water-Year Summary for Site 385853092592801

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	72019 Water level, depth LSD(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

385853092592801 Blackwater

Alluvial aquifers
Holocene Alluvium

LOCATION - Lat 38°58'53", long 92°59'28" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 sec.34, T.49 N., R.19 W., Cooper County, MO, Hydrologic Unit 10300104,

REVISIONS HISTORY - The period 08/01/2007 to 02/14/2008 had a -0.04 ft correction applied after the period was previously approved. It was noticed that on 08/01/2007 the water level measurement was 34.01 ft but the gage was started at 34.04 ft. During the next site visit on 02/14/2008 the gage was reset -0.05 ft indicating that the gage was initially set incorrectly by at least 0.03 ft.

GROUNDWATER RECORDS

DATUM - Land-surface datum is 620 ft above National Geodetic Vertical Datum of 1929. Measuring point: DNR DCP platform, 5.0 ft above land-surface datum, May 17, 2007 to present. --Top of recorder shelf setting on top of casing; 5.0 ft above land surface.

PERIOD OF RECORD - May 17, 2007 to present.

GAGE - May 17, 2007 to present, DCP with telemetry capability setting in metal box on top of casing. The water level measuring device is a float driven encoder.

COOPERATION - May 17, 2007 to present, DCP with telemetry capability, and float driven encoder as water level recording and measuring devices.

REMARKS - Data from 05/17/2007 to 09/30/2008 has been processed by the USGS with limited field water level measurements (3 measurements) during the period to verify the recorded water levels. This record is considered good. The hydrograph showed many sharp spikes (one point) in the data which showed the water level rising (recharge). It is probable these spikes were electronic problems instead of fluctuations in the water level and they were removed. Inspite of these spikes the record is accurate to +/- 0.05 ft. Data from 10/01/2008 to 04/28/2010 is good based on 5 water level measurements made during the period to verify the record and is accurate to +/- 0.05 ft. The spiking problem has dissipated. Data from 04/28/2010 to 08/30/2010 is good based on 2 water level measurements made during the period to verify the record and it is accurate to +/- 0.05 ft. Data from 08/30/2010 to 08/23/2011 is good based on 4 water level measurements made during the period to verify the record and it is accurate to +/- 0.05 ft. Data from 08/23/2011 to 04/11/2012 is good based on 2 water level measurement made during the period to verify the recorded and it is accurate to +/- 0.05 ft. Data from 04/12/2012 to 12/03/2013 is good based on 2 water level measurement made during the period to verify the recorded and it is accurate to +/- 0.05 ft. The data from 12/04/2013 to 11/23/2014 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 data from 11/24/2014 to 05/16/2016 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 data from 05/17/2016 to 12/13/2016 is good based on water level measurement made during the period to verify the recorded data and is accurate to +/- 0.05 ft.