New York: McGraw-Hill. There are numerous factors that can confound the successful operation of irrigation projects on a sustainable basis.
Indeed, these characteristics of system behavior have been highlighted as key aspects of environmental problems NRC, a. Combating nonpoint source pollution will require both basic and applied research. A climatic water balance of the Lake Erie Basin.
The ET uncertainty is scale dependent. Some contaminants are adsorbed by soil particles; the rate of adsorption depends on the mineral materials constituting the particles, their organic matter content, and the chemical nature of the contaminant—understanding of which requires the tools of physical chemistry.
These four themes are illustrated below, using a subset of the research priorities developed in Table Yet many human-induced alterations to water resources involve these types of changes.