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Table 4

Values of E and F for different arrangement and roughness of boulder

Arrangement and roughness of boulderEF
Random disposition and rounded boulders (River stones) 0.6 13.3 
Row disposition and rounded boulders 0.55 10.5 
Random disposition and crushed boulder (Quarry stones) 0.55 9.1 
Row disposition and crushed boulder 0.4 7.7 
Arrangement and roughness of boulderEF
Random disposition and rounded boulders (River stones) 0.6 13.3 
Row disposition and rounded boulders 0.55 10.5 
Random disposition and crushed boulder (Quarry stones) 0.55 9.1 
Row disposition and crushed boulder 0.4 7.7 
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