Policy interventions to promote the adoption of water saving sprinkler systems: the case of lettuce on the Gnangara Mound

The potential for improving irrigation scheduling decisions and adoption of more efficient irrigation systems is explored using a bioeconomic simulation model of lettuce production on the Gnangara Mound near Perth, Western Australia. Sandy soils with poor water and nutrient holding capacity are associated with declining marginal productivity of water at high water use, which would create an incentive to reduce water use and to adopt closer sprinkler spacing if farmers had correct information about the declining marginal productivity of water. Incorrect perceptions regarding water-yield relationships lead to over use of water by up to 50 per cent and reduce profits by 475 per crop hectare (12 per cent) in the short run, and remove the incentive to adopt more efficient systems in the long run. Higher water prices create an incentive to reduce irrigation scheduling time in the short term and to adopt more uniform sprinkler systems, and tend to reduce the discrepancies associated with poor information about the marginal productivity of water. The low level of adoption of efficient irrigation systems in the region might be explained partly by historically poor water governance and insufficient extension regarding water productivity and technology. Copyright 2007 The Authors Journal Compilation 2007 Australian Agricultural and Resource Economics Society Inc. and Blackwell Publishers Ltd .

Urban water demand with fixed volumetric charging in a large municipality: the case of Brisbane, Australia *

This paper uses suburb-level quarterly data to model residential water demand in Brisbane, Australia, from 1998 to 2003. In this system, residential consumption is charged using a fixed annual service fee with no water entitlement followed by a fixed volumetric charge per kilolitre. Water demand is specified as average quarterly household water consumption and the demand characteristics include the marginal price of water, household income and size, and the number of rainy and warm days. The findings not only confirm residential water as price and income inelastic, but also that the price and income elasticity of demand in owner-occupied households is higher than in rented households. The results also show that weather, particularly summer months and the number of rainy days, exerts a strong influence on residential water consumption. Copyright Australian Agricultural and Resource Economics Society Inc. and Blackwell Publishing Ltd 2006.

Differences in licensee, police and public opinions regarding interventions to reduce alcohol-related harm associated with licensed premises

Objectives: To determine the level of support by licensees, police and the general public for interventions to reduce alcohol-related harm associated with licensed premises and to identify differences between the three groups. Methods: Participants were 108 licensees of premises licensed to sell alcohol; 132 police officers; 200 members of the public. Questionnaires were administered either through work settings or by mail. Respondents’ levels of agreement with interventions to reduce alcohol-related harm associated with licensed premises: responsible service of alcohol; security and crowd control; policing; patron transport; and linking of alcohol-related harm to licensed premises and communication. Results: Police and members of the public were significantly more likely than licensees to agree with strategies under licensee control, such as subsidising patron transport and training staff to deal with intoxicated patrons. Police were more likely than licensees and members of the public to agree with strategies requiring community action and changes to liquor licensing laws. Licensees had significantly lower levels of agreement than the other groups about licensees’ responsibility to reduce alcohol-related harm as a consequence of drinking at their premises. Conclusions: While there was good agreement between police officers and members of the public about strategies for reducing alcohol-related harm at licensed premises, licensees held divergent views about strategies within their control. Licensees were less likely than police and members of the public to agree they were responsible for reducing alcohol-related harm resulting from drinking at their premises

Water rights for variable supplies

The relative merits of different systems of property rights to allocate water among different extractive uses are evaluated for the case where variability of supply is important. Three systems of property rights are considered. In the first, variable supply is dealt with through the use of water entitlements defined as shares of the total quantity available. In the second, there are two types of water entitlements, one for water with a high security of supply and the other a lower security right for the residual supply. The third is a system of entitlements specified as state-contingent claims. With zero transaction costs, all systems are efficient. In the realistic situation where transaction costs matter, the system based on state-contingent claims is globally optimal, and the system with high-security and lower security entitlements is preferable to the system with share entitlements