This paper reports the results of an application using an inter-regional input-output matrix for Morocco together with regional information on water consumption by sectors. We develop a trade-based index that reveals the relative water use intensities associated with specific inter-regional and international trade flows. We estimate, for each flow associated with each origin-destination pair, measures of trade in value added and trade in water that are further used to calculate our index. We add to the existing literature on virtual water flows by encompassing the sub-national perspective in the case study of a country that shows a “climate divide”: while a great part of the southern territory is located in the Sahara Desert, with serious water constraints, the northern part is relatively more privileged with access to this natural resource. Furthermore, we compare that Trade-Based Index of Water Intensity to similar metrics related to the use of other natural resources.
