Abstract
As the largest sectoral user of water, agriculture is impacted by and a major driver of water scarcity globally. Monitoring of agricultural water use is essential to identify and design effective strategies to balance water demands with other sectors and the environment under future change. Yet, most countries
face large gaps in their ability to identify where, when, how much, and for what purposes water is withdrawn or abstracted by farmers. This chapter provides a critical review of the current evidence about the technical, financial, social and political barriers to effective monitoring of agricultural water use,
focusing on the twin challenges of abstraction permitting and water use quantification. We identify enablers and barriers for new technologies – specifically satellite remote sensing – to plug gaps in in-situ monitoring infrastructure, and the need to think beyond improved data collection to how such data is then
used in design and enforcement of agricultural water resources management and planning policies.