and economical' type of protection for this bank of the estuary is stone 

 revetmento A course of stone ranging in size from screenings to 100 

 pounds should be included next to the bank to prevent erosion by water 

 passing through the voids of the larger stone „ The initial construction 

 should protect the portions of the shore that are now seriously eroding,, 

 The remaining portions of the shore should be included in the project for 

 protection, but construction can be deferred until necessitated by further 

 erosion. 



The beaches appear to be reasonably stable at present. Protection 

 of the banks will result in stoppage of the supply of beach material from 

 that source o However, this supply is meager. The stability of the beach 

 in spite of this meager supply indicates that relatively little littoral 

 movement exists. Under this condition artificial replenishment of the 

 beach as needed will be more economical than retardation of the erosion 

 by a groin system. It is the opinion of the Board that such replenishment 

 should be effected by locai interests when required as maintenance without 

 Federal aid. 



The shore of the estuary along the State hif^iway is publicly owned. 

 Its protection against, erosion by waves and currents is justified by pros- 

 pective benefits. The public interest involved warrants Federal partici- 

 pation to the extent of one-third of the total cost, in accordance with 

 the policy stated in Public Law 727, 79th Congress. 



In accordance with existing statutory requirements, the Board stated 

 its opinion that: 



a. It is advisable for the United States to adopt a project 

 authorizing the construction of stone revetment along the State highway; 



b. The public interest involved in the proposed protective 

 measures is substantial. It is associated with the direct damages to 

 publicly-owned shores by waves and currents and the loss of tax revenue 

 that will be prevented; 



c. The share of the expense which should be borne by the United 

 States is one-third of the first cost of the proposed protective measures. 

 The estimated amount of this share is $35,000. 



The Board recommended that a project be adopted by the United States 

 authorizing Federal participation by the contribution of Federal funds in 

 an amount equal to one- third of the cost of the proposed protective meas- 

 ures at Colonial Beach which comprise construction of a stone revetment 

 in sections totalling 7,350 feet in length along the State highway between 

 Hawthorne Street and Castlewood Park, about one-half of which would be 

 accomplished immediately and the remainder when required as a result of 

 future erosion. Federal participation was recommended subject to the 

 conditions that responsible local interests will; (1) adopt the plan of 

 improvement described herein; (2) assure maintenance of the protective 

 measures during their useful life, as may be required to serve their in- 

 tended purpose; (3) provide, at their own expense, all necessary lands, 



UU 



