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Concentration of nitrate and other water-quality constituents in groundwater from the water table beneath forage fields receiving seasonal applications of dairy manure, Whatcom County, Washington (2015)

Metadata Updated: October 29, 2023

Nitrate contamination of groundwater is widespread and persistent in the shallow surficial aquifer of northwestern Whatcom County where dairy farming and forage production is a primary land-use activity. Application of dairy manure to cropland is intended to provide nutrients for crop growth and improve soil quality with the ideal goal to match the rate of nutrient application to that rate of nutrient removal by the crop. A study to test an alternate strategy for scheduling manure application to fields based on hydrologic properties of specific soils and fields, measurements of manure and soil parameters, and current and forecasted precipitation for the three days immediately following manure application is being evaluated by the Whatcom County Conservation District. This alternative manure application is part of the Application Risk Management Program (ARM) http://www.whatcomcd.org/arm. Concentrations of nitrogen (in the form of nitrate, ammonia, and total nitrogen) chloride, phosphorus, and bacteria were measured in groundwater beneath dairy forage fields receiving seasonal application of dairy manure; with both conventional or alternative manure application schedules. Samples of groundwater were collected from wells screened across the water table and using an inflatable packer to isolate the upper six inches of the saturated zone from deeper portions of the well. Groundwater samples were collected from three fields at approximately monthly intervals for periods ranging from 1 to 3 years. Nitrate concentrations in groundwater from near the water table exceeded US EPA drinking water contaminant levels of 10mg/L in most samples. Concentrations of nitrate and other water quality constituents varied seasonally.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Maintainer
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Identifier USGS:575f2cc2e4b04f417c2b068f
Data Last Modified 20200827
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://datainventory.doi.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id ce67fac8-e829-4aae-9a83-a39fdb16d766
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -122.25,48.8,-122.6,49.0
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 5eb1eea86d6681389b02fda94385d95bd163f7b7e140911fbcbc60157d93e3df
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -122.25, 48.8, -122.25, 49.0, -122.6, 49.0, -122.6, 48.8, -122.25, 48.8}

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