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Start learning 50% faster. Sign in nowAuger hole method is expressed as 523000 a2 log10(Y0/Y1)/ ∆T Pipe cavity method is expressed as πr2 ln (Y0/Y1)/(S(t2-t1) Constant head permeameter is expressed as q×L/(A×t× ∆H) Spacing between drains is calculated by 4K(b2-a2)/q