Abstract
For 45 years, the ideas from the pages of WRR have been pivotal in the advancement of the science and management of the water resources. During this period, hydrologic science has become increasingly multi-disciplinary and inter-disciplinary. The hydrologic cycle is now conceptualized as the circulatory system of our planet coupling both abiotic and biotic pathways of flow that transport dissolved and suspended constituents. Humans are now recognized as active agents of change in the hydrologic cycle. Water constraints on energy development, biofuels production and carbon sequestration are emerging areas of concern. Climate change is increasingly recognized as inducing change in the hydrologic cycle, water supply, crop production and human health. The integration of science, policy and management to achieve sustainable development remains a critical challenge.
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