permeability k is estimated by using the constant head permeability test when the soil samples are ﻲ ﺍﻟﻬ ﻨﺩﺴﺔ ﺍﻟﻤﺎﺌﻴ ﺔ ﻤـﻀﻁ ﺭﺒﺎﹰ ﻓﻲ ﺍﻟﻌﺎﺩﺓ ﺃ ﻤﺎ ﻓﻲ ﻤﻌﻅﻡ ﺃﻨﻭﺍﻉ ﺍﻟﺘﺭﺒﺔ ﻓﺎﻥ ﻓﺠﻭﺍﺘﻬﺎ ﺘﻜﻭﻥ ﻤﻥ ﺍﻟﺼﻐﺭ ﺒﺤﻴﺙ ﻴﻜـﻭﻥ ﺍﻟﺠﺭﻴـﺎﻥ ﺒﺈﻴﺠﺎﺩ ﻤﻌﺎﻤل ﺍﻟﻨﻔﺎﺫﻴﺔ k ﻭ ﺍﻟﻤ ﺴﺎﻤﻴﺔ ﻟﻠﺭﻤﺎل ﺍﻟﺒﺤﺭﻴﺔ ﺍﻟﺒﻠﻭﺭﻴﺔ ﻭ ﺒﺎﺴﺘﺨﺩﺍﻡ ﻁﺭﻴﻘﺔ ﻓﻘﺩﺍﻥ ﺍﻟﻤﺎﺀ ﻤﻭﻗﻌﻴﺎﹰ ﺒﺩﺭﺠﺔ ﺤﺩل ﻋﻴﻨﺎﺕ ﺍﻟﺘﺭﺒﺔ ﻋﻥ ﻁﺭﻴﻕ ﺍﺴﺘﺨﺩﺍﻡ ﺍﻟﻁﺭﻴﻘﺔ ﺍﻟﻤﻁﺭﻴﺔ
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