Storage Capacity Evaluation for Craney Island Expansion Alternatives
Abstract
Since the 1950s the Craney Island disposal facility has been used for containment of dredged material from the navigable channels and harbors of Hampton Roads, VA. The site has annually received between 3 and 4-million cu m of maintenance dredged material. Since the existing site is nearing maximum capacity, studies were begun to evaluate potential expansion alternatives in an effort to identify the alternative that will maximize existing storage capacity (and provide approximately 50 years of additional storage capacity) while minimizing environmental impacts. The focus of this study was the volumetric storage capacity of each alternative, while two other concurrent studies evaluated separately; a) the hydrodynamic impacts of each expansion alternative on the flow regime in the Hampton Roads area; and b) the geotechnical feasibility of constructing retaining dikes for each alternative. The storage capacity, and thus the remaining active disposal life, of the existing Craney Island facility was determined as well as that of each expansion alternative, both with and without considering the existing facility. The scenarios were evaluated assuming an active dewatering program. The influence of subdividing the expansion facility into multiple compartments was also evaluated. Input requirements to the computer program (Primary Consolidation and Desiccation of Dredged Fill), necessitated compilation of the consolidation characteristics of the foundation soil and dredged material as well as the appropriate values to simulate site dewatering.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1989
- Accession Number
- ADA208124
Entities
People
- Marian E. Poindexter-rollings