Official Publications of HQ USACE siteCoastal Engineering ManualPart II/30/ EM CECW-CE Plan and execute general coastal engineering studies and investigations for project planning and design, performance monitoring and evaluation, geologic and Coastal Engineering Manual Part VI: Design of Coastal Project Elements (EM), PartIssues of Coastal hydraulics laboratory publicaction: Author: U.S This collection of publications is the single official repository for official Engineering Regulations (ERs)