in the program of remedial measures recommended by the district 

 engineer for accomplishment by the State of South Carolina, 



The Beach Erosion Board carefully considered the reports of the 

 district and division engineers. The comments and conclusions of the 

 Board are contained in the following paragraphs. 



At Pawleys laLand, the supply of new beach material is derived from 

 erosion of beaches to the north* The bar across Midway Inlet is in- 

 dicative of passage of sand across this inlet* The material is moved 

 alongshore by wave action. Southward migration of Midway and Pawleys 

 inlets indicates the predominance of southward littoral drift. The 

 recent erosion of the dunes at Pawleys Island indicates a somewhat 

 smaller rate of supply than of loss. The overall rate of supply cannot 

 be increased except by artificial replenishment. The four groins con- 

 structed in 1948 and 194-9 have not materially widened the beach to the 

 north but they have caused accelerated erosion downcoast therefrom. 

 Although the groin system proposed by the district engineer may be ef-. 

 fective to some degree in widening and stabilizing the beach at Pawleys 

 Island, the Board was of the opinion that the proposed groins are too 

 short and that the stability alignment with longer groins would be such 

 that fewer groins would be required to stabilize the shore » The Board 

 concluded that the best method of protection comprises initial con- 

 struction of one groin at the south end of the developed area, extending 

 to the 5-foot depth contour (mean low water), and extension of one exist- 

 ing groin near the middle of the island to the same depth contour, the 

 latter to be deferred until its need has been demonstrated,. 



At Edisto Beach, as at Pawleys Island, the sources of supply of 

 beach material are the beaches to the north. Except at the accretion 

 area at the south end of Edisto Beach, the rate of loss exceeds the rate 

 of supply, with resultant recession of the shore line. The material is 

 moved southward to the area of accretion by beach drifting. The four 

 groins completed in 1948 and 194-9 have caused widening of the beach in 

 their immediate vicinity and north thereof, but have caused accelerated 

 erosion of the shore to the south. In order to prevent this adverse 

 initial effect, the groin system could be filled hj artificial placement 

 of beach material in an estinated volume of 120,000 cubic yards, or the 

 groin system could be built starting beyond the south end of the 

 present problem area and progressing northward at a rate of not to exceed 

 4- groins the first year and 2 .groins a year thereafter. After the groin 

 system has been filled by natural or artificial means, the natiiral supply 

 may be sufficient to maintain the stability of the shore with little or 

 no artificial placement of additional material. Based on the behavior 

 of the existing groins, the Board believed that groins spaced 1,200 feet 

 apart will be satisfactory at Edisto Beach, The Board concluded that the 

 best method of protection would require construction of 8 additional 

 groins on a spacing of 1,200 feet and immediate artificial placement of 

 fill in their impounding areas, that the most suitable alternative method 

 would comprise construction a£ those groins immediately needed on the 



