USGS Water-Year Summary for Site 433527092265601

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	Available Parameters
	00010 Temperature, water(Mean)
	62611 Elevation, GW, NAVD88(Mean) [from pressure transducer]
	72019 Water level, depth LSD(Max.,Mean,Med.,Min.) [from pressure transducer]

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

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USGS Water-Year Summary 2023

433527092265601 NSAD North Site Agri Drain

LOCATION - Lat 43°35'26.90", long 92°26'55.84" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 sec.31, T.102 N., R.13 W., Fillmore County, MN, Hydrologic Unit 07060002, The Agri Drain is located approximately 1.75 miles SW of Ostrander, MN. The Agri Drain is located in an agricultural field. The Agri Drain is located approximately 0.4 miles NE of the intersection of 160 street and Mower/Fillmore County Line Road.

SURFACE-WATER RECORDS

PERIOD OF RECORD -

Water levels were recorded periodically from 16 March 2017 to 10 December 2018. Water levels were recorded quarter-hourly from 16 March 2017 at 19:00 CDT to 30 October 2018 at 08:15 CDT, except during the following periods:

30 Aug. 2017 at 10:00 CDT - 02 Nov. 2017 at 09:00 CDT: due to full transducer memory; newest data did not over-write oldest data.

26 Sept. 2018 at 03:15 CDT - 30 Oct. 2018 at 08:15 CDT: due to full transducer memory; newest data did not over-write oldest data.

GAGE - Continuous water level (ft. BLS), water temperature, and specific conductance were measured with a new Solinst Model 3001 Levelogger LTC non-vented pressure transducer from 16 March 2017 at 19:00 CDT to 30 October 2018 at 08:15 CDT. These data were recorded quarter-hourly by the Solinst Model 3001 LTC Levelogger pressure transducer, which had an internal data logger built into it. The data logger was hanging from a hook and housed inside the Agri Drain. The Agri Drain has a plastic cover and pad lock. The data logger was powered by an internal pressure transducer battery. Continuous water velocity and water level (meters) were measured with a ISCO 2150 Acoustic Velocity Sensor from 17 March 2017 at 11:15 CDT to 30 October 2018 at 08:00 CDT. These data were recorded quarter-hourly by a ISCO 2150 Area Velocity Module, which had an internal data logger built into it. The data logger was stored inside the Agri Drain. The data logger was power by two 6V alkaline batteries. All data were downloaded manually and no telemetry or phone line was wired into the gage.

The pressure transducer and data logger were removed from the well on 30 Oct. 2018 at 08:15 CDT. Data collection for the Impacts on Drainage Recharge study have concluded and all data logging equipment have been removed from the site.

COOPERATION - This site was operated (2016-2018) by the U.S. Geological Survey as a monitoring piezometer for the Southeast Minnesota Subsurface Drainage Impacts on Groundwater Recharge study. The piezometer began to be used as part of the Southeast Minnesota Subsurface Drainage Impacts on Groundwater Recharge study during 17 Nov. 2016 to 30 Oct. 2018. The GW Drainage Recharge study is a collaborative effort between the Environment and Natural Resources Trust Fund (via Legislative-Citizen Commission on Minnesota Resources (LCCMR)) and the U.S. Geological Survey.

REMARKS - Continuous water levels are measured with a sealed (non-vented) pressure transducer. Transducer water-levels are compensated for barometric-pressure variations the record of a nearby barometric-pressure sensor located at site NTR2-3A. The water-level record is linearly corrected to calibration water levels twice per year (Spring & Fall). Calibration water levels are measured with electric or steel tapes that are themselves calibrated about every 3 years.

Water levels below land surface appear accurate to about ±0.10 feet during 16 March 2016 to 10 December 2018 based on short-term water-level variability and calibration corrections of the water level record. Sequential water-level differences are accurate to ±0.01 feet based on manufacture specifications. However, the entire water-level record contains cyclic artifacts of the barometric pressure that remain after raw water levels from the unvented pressure transducer are corrected with the barometric pressure record. These artifacts, which are not real water level changes, are circum-daily in period and have an amplitude of about 0.02 to 0.05 feet. Additionally, the water-level record is biased depending on where in the barometric-artifact cycle calibration corrections are made. The direction of this bias is unknown, but the amount is less than or equal to the amplitude that of the artifact cycle.

Water elevation above North American Vertical Datum of 1988 (sea level) is calculated by subtracting water level (below land-surface datum) from land-surface elevation. Land-surface elevation is accurate to plus-or-minus 0.05 feet based on a differential GPS survey on 20 August 2016. Water elevation accuracy is the sum of the water level (below land-surface datum) and land-surface elevation accuracy, or about ±0.15 feet.

WATER-QUALITY RECORDS

WELL CHARACTERISTICS - Depth 3.79 ft. Upper casing diameter UPPERCASINGDIAMETER; top of first opening OPENTOPVALUE, bottom of last opening OPENBOTTOMVALUE. Agri Drain NSAD was installed using a backhoe and spade shovels. The Agri Drain is re-built by it's manufacture and deployed in the field by USGS personnel. The Agri Drain has an inflow and outflow pipe (8-inch diameter) at the base, which also water to continuously flow over a weir and through Agri Drain. The Agri Drain measuring point (stickup) was 4.10 feet (1338.85 ft. NAVD88, +/- 0.05 ft.) above land surface when measured on 17 March 2017. The open interval of the Agri Drain is between 3.14 and 3.81 feet below land surface and the total well depth is 3.79 feet below land surface.

DATUM - Land-surface datum is 1,334.75 ft above North American Vertical Datum of 1988. Measuring point: MEASURINGPOINT.

The current (primary) measuring point is a black mark on the top of the gray PVC Agri Drain, on the NE side of the rim, which was 4.10 feet above land surface on 17 November 2016. Elevation of the measuring point is 1338.85 plus-or-minus 0.05 feet above sea level, North American Vertical Datum of 1988, based on differential GPS survey on 20 August 2016.

A secondary measuring point is a black mark on the top of the gray PVC Agri Drain, on the SE side of the rim, which was 4.10 feet above land surface on 17 November 2016. Elevation of the measuring point is 1338.85 plus-or-minus 0.05 feet above sea level, North American Vertical Datum of 1988, based on differential GPS survey on 20 August 2016.

PERIOD OF RECORD -

Water temperature:

Water temperatures were recorded quarter-hourly from 16 March 2017 at 19:00 CDT to 30 October 2018 at 08:15 CDT, except during the following periods:

30 Aug. 2017 at 10:00 CDT - 02 Nov. 2017 at 09:00 CDT: due to full transducer memory; newest data did not over-write oldest data.

26 Sept. 2018 at 03:15 CDT - 30 Oct. 2018 at 08:15 CDT: due to full transducer memory; newest data did not over-write oldest data.

Specific conductance:

Specific conductance values were recorded quarter-hourly from 16 March 2017 at 19:00 CDT to 30 October 2018 at 08:15 CDT, except during the following periods:

30 Aug. 2017 at 10:00 CDT - 02 Nov. 2017 at 09:00 CDT: due to full transducer memory; newest data did not over-write oldest data.

15 Jan. 2018 at 19:30 CST - 18 Jan. 2018 at 06:00 CST: due to conductance sensor being frozen in ice (bad data) at bottom of Agri Drain.

09 Feb. 2018 at 03:00 CST - 23 Feb. 2018 at 12:00 CST: due to conductance sensor being frozen in ice (bad data) at bottom of Agri Drain.

26 Sept. 2018 at 03:15 CDT - 30 Oct. 2018 at 08:00 CDT: due to full transducer memory; newest data did not over-write oldest data.

INSTRUMENTATION - Water temperature and specific conductance are measured with an Solinst Levelogger LTC 3001 submersible pressure transducer accurate to +/- 0.1°C. Temperature differences are accurate to 0.1°C.

REMARKS - Significant and sudden changes in the specific conductance record are often due to rainfall and/or snowmelt events. These recharge events cause pulses of lower or higher conductance water to quickly move through the drainage tile system and the Agri Drain structure (where the specific conductance sensor was deployed). The specific conductance record was very noisy during November-December 2017 for an unknown reason. This noise was left in the record since there was not definitive reasoning for deleting these data. The specific conductance daily-data records are much less noisy.