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The Barataria and Breton Sound Basins have experienced rapid loss of coastal wetlands due to natural processes such as subsidence and erosion, as well as man's developmental activities including leveeing, channelization, and petroleum exploration. These activities have led to a reduction in overbank flooding and natural distributary flow which historically provided fresh water, sediments and nutrients to estuarine areas. This has resulted in conversion of fresh, intermediate, and brackish marches to intermediate, brackish, and saline marshes, respectively, as well as loss of some areas of wooded swamp. Saltwater intrusion and loss of wetlands have adversely affected productivity of wildlife and fishery resources. Influx of saline waters is particularly harmful to the American oyster, due to increased predation. One way to ameliorate loss of wetland nursery areas and rate of saltwater intrusion is timely introduction of fresh water and associated sediments and nutrients. A total of 16 plans were evaluated basically of combinations of six fresh water into the study area. These 16 plans consist basically of combinations of six fresh water diversion sites and various magnitudes of flow. Based on the results of this study, it has been recommended that fresh water from the Mississippi River be diverted into the Barataria Basin at a site near Davis Pond (river mile 118.4) and into the Breton Sound Basin at Big Mar (river mile 81.5).
Louisiana's estuaries and wetlands are among the most productive in the nation in terms of fish and wildlife. With 41 percent of the nation's wetlands, Louisiana provides 25 percent of the commercial fish harvest and 40 percent of the fur harvest. The capacity of the estuaries and wetlands to support the abundant and diverse fish and wildlife populations is seriously threatened by habitat changes associated wth saltwater intrusion. The deterioration of habitat conditions and the consequent effect on fish and wildlife productivity is expected to continue. To address this problem, an investigation was conducted to determine the feasibility of reducing saltwater intrusion to improve fish and wildlife productivity. To find a solution to this problem, a number of measures were considered. The measure that provides the best solution to saltwater intrusion is freshwater diversion. This measure would establish favorable salinity conditions, enhance vegetative growth, reduce land loss, and increase production of commercial and sport fish and wildlife. A total of 16 plans to divert freshwater into the area were evaluated. The plan would reduce saltwater intrusion, save about 99,200 acres of marsh, and increase oyster production by 16,400,000 pounds, which represents a 25-percent increase in the national oyster harvest.
The Barataria and Breton Sound Basins have experienced rapid loss of coastal wetlands due to natural processes such as subsidence and erosion, as well as man's developmental activities including leveeing, channelization, and petroleum exploration. These activities have led to a reduction in overbank flooding and natural distributary flow which historically provided fresh water, sediments, and nutrients to estuarine area. This has resulted in conversion of fresh, intermediate, and brackish marshes to intermediate, brackish, and saline marshes, respectively, as well as loss of some areas of wooded swamp. Saltwater intrusion and loss of wetlands have adversely affected productivity of wildlife and fishery resources. Influx of saline waters is particularly harmful to the American oyster, due to increased predation. One way to ameliorate losses of wetland nursery areas and rate of saltwater intrusion is timely introduction of fresh water and associated sediments and nutrients. A total of 16 plans were evaluated for diversion of fresh water into the study area. These 16 plans consist basically of combinations of six fresh water deversion sites and various magnitudes of flow. Based on the results of this study, it has been recommended that fresh water from the Mississippi River be diverted into the Barataria Basin at a site near Davis Pond (river mile 118.4) and into the Breton Sound Basin at Big Mar (river mile 81.5).
The Barataria and Breton Sound Basins have experienced rapid loss of coastal wetlands due to natural processes such as subsidence and erosion, as well as man's developmental activities including leveeing, channelization, and petroleum exploration. These activities have led to a reduction in overbank flooding and natural distributary flow which historically provided fresh water, sediments, and nutrients to estuarine areas. This has resulted in conversion of fresh, intermediate, and brackish marshes to intermediate, brackish, and saline marshes, respectively, as well as loss of some areas of wooded swamp. Saltwater intrusion and loss of wetlands have adversely affected productivity of wildlife and fishery resources. Influx of saline waters is particularly harmful to the American oyster, due to increased predation. One way to ameliorate loss of wetland nursery areas and rate of saltwater intrusion is timely introduction of fresh water and associated sediments and nutrients. A total of 16 plans were evaluated for diversion of fresh water into the study area. These 16 plans consist basically of combinations of six fresh water diversion sites and various magnitudes of flow. Based on the results of this study, it has been recommended that fresh water from the Mississippi River be diverted into the Barataria Basin at a site near Davis Pond (river mile 118.4) and into the Breton Sound Basin at Big Mar (river mile 81.5).