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Related Experiment Video

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Watershed Planning within a Quantitative Scenario Analysis Framework

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

Quantifying MCPA load pathways at catchment scale using high temporal resolution data.

Kevin Atcheson¹, Per-Erik Mellander², Rachel Cassidy³

¹School of Geography and Environmental Sciences, Ulster University, Coleraine, UK.

|May 31, 2022

Summary

MCPA herbicide is highly mobile in water, with most loss occurring during storm events via surface flow. Understanding these pathways is key for effective water quality management.

Keywords:

Catchments Export loads MCPA Pathways Pesticides

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Capturing Flow-weighted Water and Suspended Particulates from Agricultural Canals During Drainage Events

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Published on: November 7, 2017

Area of Science:

Environmental Chemistry
Hydrology
Water Resource Management

Background:

Detection of the herbicide MCPA in drinking water sources is a growing concern due to its mobility and unknown catchment-scale transport.
Understanding MCPA's hydrological pathways is crucial for effective mitigation and monitoring of water quality.

Purpose of the Study:

To investigate MCPA transport pathways in a river catchment during the herbicide spraying season.
To quantify MCPA loads and differentiate contributions from various hydrological pathways.

Main Methods:

Collected river discharge and MCPA concentration data over a 7-month spraying season.
Utilized continuous and hourly sampling during storm events.
Applied pathway separation techniques to apportion MCPA loads into event and baseflow components.

Main Results:

85.2 kg of MCPA was exported from the catchment over 7 months.
87.7% of MCPA load was transported via event flow, with 72.0% via surface-dominated (quickflow) pathways.
Approximately 12% of MCPA was transported via deep baseflows, indicating persistence.

Conclusions:

MCPA loss from catchments is predominantly an acute, storm-dependent process.
Reducing herbicide use and disconnecting surface pathways are key mitigation strategies.
High temporal resolution monitoring is essential for assessing mitigation effectiveness.