APPENDIX F 

 DESIGN STUDIES AND COST ESTIMATES 



INTRODUCTION 



F-1. The design features and cost estimates for the recommended 

 plan of hufricane protection for Narragansett Bay, consisting of the 

 Fox Point barrier and three Lower Bay barriers, are presented in this 

 appendix. The locations of these projects and of the other sites 

 considered are shown on Plate F-1. The principal features of the 

 recommended plan are shown on Plates 3 to 7 inclusive, in the main 

 report, 



SURVEYS AND EXPLORATIONS 



F-2. Both the designs and cost estimates for the selected 

 plan are based on recent topographic and hydrographic surveys and 

 subsurface investigations. Special topographic maps, scale 1:2U00, 

 with 2-foot contours, were prepared by the Coast and Geodetic 

 Survey for the Fox Point area and for the center of Providence. 

 The standard quadrangle sheets of the U.S. Geological Survey were 

 used for the Lower Bay East and Tifest barriers. In addition, photo- 

 grammetric maps of the Public Works Department of the State of 

 Rhode Island were available for the Tiverton barrier site, and 

 supplementary information was obtained by field surveys. 



Fathometer surveys were made of the selected sites T»here neces- 

 sary. 



Subsurface investigations, described in Appendix E, included 

 a total of 29 borings. Borings were available for the West barrier 

 and Tiverton sites, and seismographic studies were made for the 

 East barrier. 



DESIGN CRITERIA 



F-3. The structures have been designed to withstand a design 

 hurricane. Both the design criteria and the selected top eleva- 

 tions are shown in Table F-1, below. Appendix B contains further 

 details on design tidal flood and design waves. 



F-1 



