Appendix A 



Case Design Example of a 



Detached Breakwater Project 



Introduction 



This appendix was prepared by Mr. Edward T. Fulford of Andrews Miller 

 and Associates, Inc. The community of Bay Ridge, Anne Arundel County, 

 Maryland, is located on the western shore of the Chesapeake Bay near 

 Annapolis as shown in Figure Al. The shoreline is about 2,250 ft in length 

 and is composed of a sandy beach fronting a bank ranging in height from 

 about 8 to 24 ft. Bay Drive runs parallel to the shoreline in this area and a 

 sewer line also parallels the shoreline along the western side of Bay Drive. 



As a result of continued erosion of the bank and shoreline at a rate of 2 to 

 3 ft per year, a feasibility study was completed in January 1987 which 

 recommended the construction of offshore breakwaters and beach fill as the 

 only effective alternative to provide erosion control and storm protection for 

 the area without eliminating the existing recreational use of the beach. 

 Figure A2 shows the eroded condition of the beach prior to project 

 construction. 



In September 1990, detailed design of the project was completed and 

 construction was initiated in November 1990. The following paragraphs 

 discuss the design and construction of the offshore breakwater and beach fill 

 project and the preliminary post-construction performance of the project. 



Coastal Processes 



Winds 



The wind conditions at Bay Ridge were developed from wind observations 

 at the Baltimore-Washington International Airport. The length of the wind 



Appendix A Case Design Example of Detached Breakwater 



A1 



