Arbitration at the Limits of Law: Scientific Uncertainty, Hydro-Politics, and the Indus Waters Regime

Abstract

The increasing complexity of transboundary water disputes exposes the structural limits of traditional international legal mechanisms in delivering effective, consistent, and legitimate outcomes. While arbitration has been progressively institutionalized within the normative framework of international water law, its practical application reveals constraints that extend beyond procedural design. These constraints are rooted in the interaction between three interrelated dimensions: the indeterminacy of legal principles, the epistemic challenges associated with scientific uncertainty, and the influence of hydro-political asymmetries. This article critically examines the role of arbitration through an analysis of the Indus Waters Treaty regime between India and Pakistan, situating it within a broader legal and epistemological framework. It argues that arbitration in transboundary water disputes operates at the intersection of law, science, and power, where the expectation of definitive legal resolution encounters the reality of contested knowledge and strategic state behavior. In this context, arbitral processes are required to interpret open-textured legal norms such as equitable utilization and the obligation not to cause significant harm, while simultaneously engaging with uncertain and evolving scientific evidence. Drawing on doctrinal analysis, case-based evaluation, and interdisciplinary insights, the article demonstrates that arbitration contributes to the clarification of legal norms but remains structurally constrained in its ability to resolve disputes in a comprehensive and lasting manner. The Indus Waters regime illustrates how institutional sophistication and procedural design cannot fully overcome the underlying tensions between legal indeterminacy, environmental variability, and geopolitical realities. The article concludes by identifying key gaps in the existing framework and proposing a recalibration of arbitration mechanisms through greater integration of scientific expertise, adaptive legal interpretation, and enhanced sensitivity to hydro-political dynamics. In doing so, it advances a broader argument that the limitations of arbitration are not incidental, but are embedded within the evolving structure of international water governance itself.