The deltaic lowlands of the Louisiana coastal zone are exceptionally high in biologic productivity. Natural beauty and a rich cultural heritage further identify the coastal lowlands as a nationally important resource. As

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the origin and ecology of the region are products of deltaic processes, it can be described appropriately as a self-maintaining natural system.

Human activity has altered seriously the natural balance of the delta system. Massive environmental degradation has occurred during the past 30 years, and the entire system may soon collapse. Primary causes of deterioration include (1) flood-control and navigation improvement; (2) accelerated subsidence; (3) urban encroachment into wetlands; and (4) water pollution.

A pilot study in south-central Louisiana has reviewed the problem of restoring the system's balance and allowing for projected growth and development. A multi-use management plan based on analysis of natural and human processes operating in the area and land-use suitability has been proposed. Highways and other public-works projects provide the mechanism for directing growth and development to environmentally suitable areas. Renewable resource areas are identified, and management priorities and guidelines outlined. A water-resource management program calls for conservation of local runoff as well as directing Mississippi River water and sediment for environmental maintenance and enhancement. Controlled delta building and introduction of supplementary water into estuarine basins will p rtly restore the delta-system balance. Other features of the plan include identification of transportation and utilities corridors, man-made barrier islands as protection against erosion and storm surge, geometries for dredge cuts and spoil designed to create habitat diversity and optimize hydrology.

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