Data on water quality and other environmental issues are being collected at an ever-increasing rate. In the past, however, the techniques used by scientists to interpret this data have not progressed as quickly. This is a book of modern statistical methods for analysis of practical problems in water quality and water resources.The last fifteen years have seen major advances in the fields of exploratory data analysis (EDA) and robust statistical methods. The 'real-life' characteristics of environmental data tend to drive analysis towards the use of these methods. These advances are presented in a practical and relevant format. Alternate methods are compared, highlighting the strengths and weaknesses of each as applied to environmental data. Techniques for trend analysis and dealing with water below the detection limit are topics covered, which are of great interest to consultants in water-quality and hydrology, scientists in state, provincial and federal water resources, and geological survey agencies.The practising water resources scientist will find the worked examples using actual field data from case studies of environmental problems, of real value. Exercises at the end of each chapter enable the mechanics of the methodological process to be fully understood, with data sets included on diskette for easy use. The result is a book that is both up-to-date and immediately relevant to ongoing work in the environmental and water sciences.

Extract: Beginning with the Mormon colonization of Salt Lake Valley, Utah, in 1847, irrigation has been a significant part of agriculture in the United States. Most of the Nation's irrigated acreage has always been located in the arid and semiarid regions of the West, but in recent years supplemental irrigation has been steadily increasing in the humid East. More farmers in eastern regions are finding that supplemental irrigation is profitable, especially as insurance against crop failures in drought years, and also by increasing average yields. Water supply is apparently the principal constraint to irrigation expansion in the West. Conservation of available water resources is apparently the best measure for expanding irrigation there.

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This report includes charts and tables on the climatic and physiographic influence on irrigation development; farm data comparing selected characteristics of irrigated and nonirrigated farms; and data on water application systems, sources of water, pump energy expenses by energy type, values of irrigated and nonirrigated land, and cash rents.