The Columbia River Estuary Data Development Program (CREDDP), a federally-funded research program, began in 1978 and was completed in 1984. The purpose of the program was to provide a foundation of scientific knowledge about the estuary and to provide information useful in managing land and water resources through the public planning and permitting processes. This Guide was prepared for people who need to understand the effects on the estuary of proposed development projects, but who do not necessarily have special training in estuarine science. The Guide explains the principles on which environmental assessments are based and presents some necessary scientific background.
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