Environmental Assessment for Proposed Dredging Operations in Yap Lagoon

Strong, Ronald D.; Randall, Richard H.; Smalley, Thomas L.; Bumoon, Sen; Bowoo, Otto (January 1982). Environmental Assessment for Proposed Dredging Operations in Yap Lagoon (Report). Mangilao, Guam: University of Guam Marine Laboratory. pp. 1–96.

• Has attachment: File:PLJU3F46.pdf

Abstract: Technical environmental assessment of proposed lagoon dredging sites across Yap Island, Federated States of Micronesia, conducted in cooperation with the Yap Department of Public Utilities and Contracts. The report documents field investigations at twelve lagoon and reef flat sites including Kanif (Gaatamoon), Meerur, Ngof, Balabat, Magachaguill (old airport dredge site), Keng (new hospital), Dugor, Rumw, German Channel, Map Bridge, and Map School. Methods combine biological reconnaissance (corals, fishes, macroinvertebrates, seagrasses), sediment characterization, and limited current measurements using dye and drogue techniques. Each site is analyzed in terms of geomorphology, substrate composition, ecological communities, and prior dredging impacts. The study identifies patterns in sediment suitability (bioclastic reef deposits vs. clay-rich intertidal zones), documents alterations to circulation and habitat structure from earlier dredging, and provides operational recommendations including containment moles, current monitoring, and dredging timing. The report serves as a baseline technical reference for coastal engineering, environmental management, and infrastructure development in Yap lagoon systems.