Table 1. Representative values of porosity, specific yield, and hydraulic conductivity of consolidated and unconsolidated materials (Linsley and others, 1958).

Material	Porosity %	Specific Yield %	Hydraulic Conductivity (Permeability) gal/day.ft2
clay	45	3	1
sand	35	25	800
gravel	25	22	5000
gravel and sand	20	16	2000
dense limestone and shale	5	2	1
granite	1	0.5	0.1

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Last updated on March 26, 2009

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