USGS Water-Year Summary 2023

384545093331601 Knob Noster

Ozark Plateaus aquifer system
Canadian Series

LOCATION - Lat 38°45'45.5", long 93°33'16.2" referenced to North American Datum of 1983, in SW 1/4 NW 1/4 sec.22, T.46 N., R.24 W., Johnson County, MO, Hydrologic Unit 10300104,

REVISIONS HISTORY - Revisions: Land-surface datum was revised to 802.83 ft NAVD88 on Oct. 4, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published in error as 795 ft NGVD29 from topographic map. Discrete water-level measurements referenced to NGVD29 and NAVD88 were revised, based on changes to the land-surface datum.

GROUNDWATER RECORDS

DATUM - Land-surface datum is 802.83 ft above North American Vertical Datum of 1988. Measuring point: DNR DCP platform, 1.5 ft above land-surface datum, Apr. 19, 1956 to present.  

PERIOD OF RECORD - June 27, 2007 to present.

GAGE - June 27, 2007 to present; DCP with telemetry capability, and float and encoder installed as the water level recording and measuring devices.

COOPERATION - June 27, 2007 to present, data furnished by Missouri Department of Natural Resources (MDNR). June 27, 2007 to present, data processed by USGS and MDNR.

REMARKS - The float occaisionally sticks in the well. When the float becomes free, the jump in the hydrograph is typically less than 0.1 ft. Data from 06/27/2007 to 09/30/2008 has been processed by the USGS with limited field water level measurements (2 measurements) during the period to verify the recorded water levels. This record is considered good and accurate to +/- 0.05 ft. Data from 10/01/2008 to 11/17/2010 is good based on 7 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. Data from 11/17/2010 to 05/23/2011 is good based on 3 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. Data from 05/24/2010 to 08/15/2011 is good based on 4 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. Data from 08/16/2011 to 11/12/2013 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 11/13/2013 to 11/12/2014 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 11/13/2014 to 05/17/2016 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 05/18/2016 to 11/29/2016 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 11/30/2016 to 01/22/2018 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 01/23/2018 to 07/10/2018 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 07/11/2018 to 02/13/2019 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 02/14/2019 to 09/03/2019 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. 

All further remarks can be found in RMS as of 09/04/2019.