Ground-water quality data from the Abbotsford-Sumas aquifer of southwestern British Columbia and northwestern Washington State, February 1997

Cox, Stephen E.; Liebscher, Hugh

doi:10.3133/ofr99244

Cited by 4 publications

(5 citation statements)

References 10 publications

(14 reference statements)

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“…The ASA is an unconfined aquifer predominantly made up of glaciofluvial sand and gravel with minor till and clayey silt lenses, with depths up to 70 m (Dakin, 1993). The average water table depth is 12 to 40 m below the surface (Cox and Liebscher, 1999). …”

Section: Methodsmentioning

confidence: 99%

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A Field‐Scale Approach to Estimate Nitrate Loading to Groundwater

et al. 2018

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The quantification of groundwater NO loading associated with a specific field or set of management practices so that groundwater quality improvements can be objectively assessed is a major challenge. The magnitude and timing of NO export from a single agricultural field under raspberry ( L.) production were investigated by combining high-resolution groundwater NO concentration profiles (sampled using passive diffusion samplers) with Darcy's flux estimation at the field's down-gradient edge (based on field-measured hydraulic gradients and laboratory-estimated hydraulic conductivity). Annual recharge estimated using Darcy's law (1002 mm) was similar to that obtained using two other approaches. The similarity in the rate of Cl applied to the field and the estimated export flux over the 1-yr monitoring period (51 vs. 56 kg Cl ha) suggested the mass flux estimation approach was robust. An estimated 80 kg NO-N ha was exported from the agricultural field over the 1-yr monitoring period. The greatest monthly groundwater mass flux exported was observed in February and March (∼11 kg NO-N ha), and was associated with NO leached from the soil zone during the onset of precipitation in the previous autumn. Provided the groundwater recharged from the field of interest can be isolated within a vertical profile, this approach is an effective method for obtaining spatially integrated estimates of the magnitude and timing of NO loading to groundwater.

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Section: Methodsmentioning

confidence: 99%

“…Land use on the ASA has long been predominantly agriculture (Hii et al, 1999). Red raspberry and blueberry ( Vaccinium corymbosum L.) are the dominant crops, whereas poultry broiler production is the dominant animal production on the ASA (Cox and Liebscher, 1999; Zebarth et al, 2015). …”

Section: Methodsmentioning

confidence: 99%

A Field‐Scale Approach to Estimate Nitrate Loading to Groundwater

et al. 2018

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“…Additionally, the maintenance of septic tanks in high residential watersheds should be considered. Management alternatives for lowering the manure loading may include dairy animal herd reduction, manure exporting, and the adoption of feeding strategies to reduce the nitrogen content in animal waste (Davis et al, 1999;Rotz et al, 1999;Jonker et al, 2002). Management alternatives related to fertilizer application include the use of nitrification inhibitors, the use of surrogate fertilizers that have lower amounts of nitrogen, split application of fertilizers, and accounting for nitrogen in the irrigation water and soil (Delgado and Mosier, 1996;Delgado, 2001b).…”

Section: Prioritization Of Management Actionsmentioning

confidence: 99%

“…The results showed that nitrate concentrations ranged from less than 0.01 to 53 mg/l. Many studies showed that agricultural practices, dairy farming, and lagoons are the probable cause of excessive nitrate levels in the shallow ground water of the area (Liebscher et al, 1992;Erickson, 1992Erickson, , 1994Garland and Erickson, 1994;Hulsman, 1998;Hii et al, 1999;Cox and Liebscher, 1999;Carey, 2002). In order to manage nitrogen pollution and other water-related issues, Washington State Legislature passed the Engrossed Substitute House Bill 2514 codified as RCW 90.82 in 1988.…”

Section: Introductionmentioning

confidence: 96%

Assessment and management of long-term nitrate pollution of ground water in agriculture-dominated watersheds

Almasri¹,

Kaluarachchi²

2004

Journal of Hydrology

210

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“…Low precipitation during the crop growing season (April–September) makes the region irrigation dependent. The occurrence of the majority (∼70%) of precipitation between October to March results in a highly seasonal recharge pattern and high water table fluctuation (2 to 3 m annually, on average; Kohut, 1987; Cox and Liebscher, 1999; Graham et al, 2015). Regional groundwater flow is generally from the north, toward the Nooksack River in the south.…”

Section: Methodsmentioning

confidence: 99%

Quantification of Groundwater Nitrate Loading after Raspberry Field Renovation Using High‐Resolution Passive Diffusion Sampling

et al. 2019

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The Abbotsford-Sumas Aquifer is a permeable, unconfined aquifer in British Columbia, Canada, where raspberry (Rubus idaeus L.) production is an important source of groundwater NO 3 contamination. Renovation of raspberry fields (i.e., canes chopped, soil tilled and fumigated, and spring manure application prior to replanting), which typically occurs every 6 to 10 yr in response to decreased crop vigor, has been suggested as a possible cause of significant interannual variation in groundwater NO 3 concentrations. This study used high-resolution passive diffusion sampling to quantify the magnitude and timing of NO 3 loading to shallow groundwater from a commercial raspberry field during a 6-yr (2009-2015) monitoring period after crop renovation. After renovation, the annual NO 3 loading increased from ?95 kg N ha −1 in Year 1 to ?245 kg N ha −1 in Year 2 and decreased to ?85 kg N ha −1 in Year 3. The average annual NO 3 loading from Years 4 to 6 (72 kg N ha −1 ) was assumed to reflect annual loading without a renovation effect, and the increased loading during Years 1 to 3 was attributed to renovation. Renovation contributed an estimated 33 to 23% of total groundwater NO 3 from this field for a 6-to 10-yr renovation cycle. Most of the NO 3 loading associated with renovation occurred in Year 2 and was attributed to the manure application. The increased NO 3 loading after renovation likely contributes to the spatial and temporally varying NO 3 patterns observed in the aquifer. Reducing manure applications during renovation and decreasing renovation frequency have the potential to decrease the groundwater NO 3 concentration.

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Ground-water quality data from the Abbotsford-Sumas aquifer of southwestern British Columbia and northwestern Washington State, February 1997

Abstract: , and minimum reporting levels, drinking water standards, and freshwater criteria for protection of aquatic life .

Cited by 4 publications

References 10 publications

A Field‐Scale Approach to Estimate Nitrate Loading to Groundwater

A Field‐Scale Approach to Estimate Nitrate Loading to Groundwater

Assessment and management of long-term nitrate pollution of ground water in agriculture-dominated watersheds

Quantification of Groundwater Nitrate Loading after Raspberry Field Renovation Using High‐Resolution Passive Diffusion Sampling

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