Perth, Western Australia (pop. 1.6m) derives 60% of its public water supply from the Gnangara groundwater system (GGS). Horticulture, domestic self-supply, and municipal parks are other major consumers of GGS groundwater. The system supports important wetlands and groundwater-dependent ecosystems. Underlying approximately 2200km² of the Swan Coastal Plain, the GGS comprises several aquifer levels with partial interconnectivity. Supplies of GGS groundwater are under unprecedented stress, due to reduced recharge and increases in extraction.

Most theorists regard transaction costs as one of the key lenses to understand the water rights market. This paper proposes a theoretical model of water rights trading with transaction costs according to the idea of costs minimization. Applying the model to the Yellow River Basin (YRB), we evaluate the potential of investment savings from introducing the trans-jurisdictional water market to achieve the water-saving targets of agricultural and industrial sectors.

In Afghanistan, where 80% of the population is rural, irrigated agriculture using surface water is an extremely important economic activity. With the advent of the New Water Law, highly localized and centuries-old agricultural water management traditions are giving way to more modern centralized institutions. The newly-created river basin councils need management tools to support decision-making at the watershed level.

Beginning in 1998, an innovation in water rights policy took place in Colorado. This paper analyses the diffusion of the recreational in-channel water right policy innovation among Colorado communities. This research involved in-depth case studies in 12 Colorado communities. Data include interviews, legal and legislative documents, and mass media coverage. These new water rights spread among Colorado communities through two processes. First, experts acted as information entrepreneurs providing both technical and policy information to other communities.

Freshwater resources are becoming increasingly limited in many parts of the world, and decision makers are demanding new tools for monitoring water availability and rates of consumption. Remotely sensed thermal-infrared imagery collected by Landsat provides estimates of land-surface temperature that allow mapping of evapotranspiration (ET) at the spatial scales at which water is being used. This paper explores the utility of moderate-resolution thermal satellite imagery in water resource management.

For the past 160 years, the prior appropriation system of the Western United States has adapted to changing water uses and shifting societal priorities. This paper argues that prior appropriation creates sufficient certainty to allow for economic development and facilitate water markets, yet is flexible enough to adapt to changing priorities and water supplies. Because it possesses both flexibility and certainty, it is a strong enough framework for the Western United States to weather the possible effects of climate change on water supply.

An attempt is made here to shed light on how water legislation could address the climate change challenge. Although climate change legislation provides a framework for the integration of climate change issues into government policies on several topics, it does not cover water resources as such. Therefore, water legislation must provide for such integration. The challenge is to find a balance between well-defined water rights, duties and administrative functions on the one hand and, on the other, the flexibility required to respond to the vagaries of a changing climate.

This paper presents an institutional analysis of hydropower development in Chile, focusing on the main legal institutions involved and relevant jurisprudence. Hydropower expansion took place within a neoliberal institutional framework imposed by the military government (1973–1990) that included reforms in both the water and electricity sectors. One of the stated purposes of these reforms was to remove ideology from both water management and electricity generation and ensure the neutrality of the state.

An analysis of Arizona's water resources system has been implemented. This study uses a qualitative system analysis approach to evaluate the most important components of the system: water supply, water demand, laws and regulations, stakeholders, decision makers, etc. Moreover, the investigation centres on some key components of the water resources system such as water conservation in active management areas (AMA), rural Arizona, population growth, and water rights transfers.

Climate change and recurrent drought in many of the world's dry places continue to inspire the search for economically attractive measures to conserve water. This study analyzes water conservation practices in irrigated agriculture in a sub-basin in North America's Rio Grande. A method is developed to estimate water savings in irrigated agriculture that result from public subsidies to farmers who convert from surface to drip irrigation. The method accounts for economic incentives affecting farmers' choices on irrigation technology, crop mix, water application, and water depletion.

Augustin Cournot's original concept of “complementary oligopoly” has recently had a rebirth of interest after being relabeled “the tragedy of the anticommons” and finding fresh applications in the legal and economics literatures. The tragedy of the anticommons (the mirror image of the more well-known tragedy of the commons) occurs when too many rights holders to a good lead to sub-optimal usage. Inefficient outcomes are only overcome when rights holders are reduced or consolidated.