TY - JOUR
T1 - Optimal strategies for monitoring irrigation water quality
AU - Lothrop, Nathan
AU - Bright, Kelly R.
AU - Sexton, Jonathan
AU - Pearce-Walker, Jennifer
AU - Reynolds, Kelly A.
AU - Verhougstraete, Marc P.
N1 - Funding Information:
This work was funded by grants from the Center for Produce Safety (Grant # 2015CPS05 ) and the Arizona Department of Agriculture’s Specialty Crop Block Grant Program (Grant # SCBGP-FB14-01 ).
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/2
Y1 - 2018/2
N2 - The quality of irrigation water drawn from surface water sources varies greatly. This is particularly true for waters that are subject to intermittent contamination events such as runoff from rainfall or direct entry of livestock upstream of use. Such pollution in irrigation systems increases the risk of food crop contamination and require adoption of best monitoring practices. Therefore, this study aimed to define optimal strategies for monitoring irrigation water quality. Following the analysis of 1357 irrigation water samples for Escherichia coli, total coliforms, and physical and chemical parameters, the following key irrigation water collection approaches are suggested: 1) explore up to 950 m upstream to ensure no major contamination or outfalls exists; 2) collect samples before 12:00 p.m. local time; 3) collect samples at the surface of the water at any point across the canal where safe access is available; and 4) composite five samples and perform a single E. coli assay. These recommendations comprehensively consider the results as well as sampling costs, personnel effort, and current scientific knowledge of water quality characterization. These strategies will help to better characterize risks from microbial pathogen contamination in irrigation waters in the Southwest United States and aid in risk reduction practices for agricultural water use in regions with similar water quality, climate, and canal construction.
AB - The quality of irrigation water drawn from surface water sources varies greatly. This is particularly true for waters that are subject to intermittent contamination events such as runoff from rainfall or direct entry of livestock upstream of use. Such pollution in irrigation systems increases the risk of food crop contamination and require adoption of best monitoring practices. Therefore, this study aimed to define optimal strategies for monitoring irrigation water quality. Following the analysis of 1357 irrigation water samples for Escherichia coli, total coliforms, and physical and chemical parameters, the following key irrigation water collection approaches are suggested: 1) explore up to 950 m upstream to ensure no major contamination or outfalls exists; 2) collect samples before 12:00 p.m. local time; 3) collect samples at the surface of the water at any point across the canal where safe access is available; and 4) composite five samples and perform a single E. coli assay. These recommendations comprehensively consider the results as well as sampling costs, personnel effort, and current scientific knowledge of water quality characterization. These strategies will help to better characterize risks from microbial pathogen contamination in irrigation waters in the Southwest United States and aid in risk reduction practices for agricultural water use in regions with similar water quality, climate, and canal construction.
KW - Agriculture
KW - Escherichia coli
KW - Food crop safety
KW - Irrigation water quality
KW - Monitoring guidelines
KW - Water management
UR - http://www.scopus.com/inward/record.url?scp=85039430098&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85039430098&partnerID=8YFLogxK
U2 - 10.1016/j.agwat.2017.12.018
DO - 10.1016/j.agwat.2017.12.018
M3 - Article
AN - SCOPUS:85039430098
SN - 0378-3774
VL - 199
SP - 86
EP - 92
JO - Agricultural Water Management
JF - Agricultural Water Management
ER -