Calcasieu River Sediment Removal Study
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
Pagination or Media Count:
The periodic maintenance of 14 miles of the Calcasieu River by sediment removal is required to restore a navigable waterway. One alternative being considered for the Calcasieu River is hydraulic dredging, with temporary or permanent dredged material disposal in an upland confined disposal facility CDF. Monitoring data collected during the 1988-1989 maintenance event indicated that the CDFs may not have been properly managed for maximum efficiency in settling, retention of suspended solids, and possible contaminants. Laboratory column settling tests and modified elutriate tests were performed on three Calcasieu River sediments. The settling behaviors were observed to be typical of other sediments if hydraulically dredged and placed in a CDF. The compression tests data were used to develop the initial storage requirements. The flocculent tests data indicated that the suspended solids will settle by gravity. Results of the modified elutriate tests, which predict both dissolved concentrations of contaminants and particle-associated contaminant under quiescent settling conditions, were below the Federal Water Quality Criteria.
- Hydrology, Limnology and Potamology
- Civil Engineering
- Solid Wastes and Pollution and Control