LOK-GARD 



Lok-Gord Blocks 



Filter 

 SECTION 



^Oy' Lok-Gord Block 

 I ^V^s^*^ Top Perspective 



Lok-Gard revetment, Cedarhurst, Md. 



Prototype Installation : 



Tilgham Island, Maryland. 



800 feet of shoreline protected by 1 on 2 slope Lok-Gard revetment. 



Estimated storm wave height 5 feet (Mohl and Brown, 1967). 



Wave Tank Tests : 



Prototype- scale tests: Blocks stable for a 4. 8- foot-high, 4.7-second 

 wave period attack; embankment slope was 1 on 2. 



The revetment was bedded on a 6-inch layer of crushed stone and 

 plastic filter cloth (Hall, 1966). 



Design Factors : 



Zero-damage wave height: 5 feet (determined in wave tank tests). 



Wave runup: 0.9 to 1 compared to smooth slopes (estimated),. 



Wave reflection: High (estimated). 



Remarks : 



Lok-Gard units weigh 75 pounds each. 



Design requires filter and toe protection. 



Toe protection could be buried toe or weighted with larger rocks or 

 concrete bags. 



Revetment has little reserve stability. 



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