Basa: Iyo goko rakagadzirwa nechina-parutivi elastic jira, inopfeka-inodzivirira uye isingapinde mvura, inofema, isina kupera, isina deformation, kukurumidza kweruvara kusvika padanho 4 kana pamusoro, tekinoroji isina mvura jira rekudzivirira mvura kumanikidza index uye mwando permeability index kumusoro. kusvika ku6000+.