Porosity2012a

Porosity2012a - Where does your drinking water come from...

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1 Where does your drinking water come from? Aquifer : A geologic unit that can store transmit water to wells. Water wells in the Biscayne Aquifer Biscayne Aquifer 0 ft. thickness along western edge Thickens as a wedge to 200 250 ft at 200-250 ft. at Coastline Aquifer is made up of two parts Matrix : the solid material Voids (Pores) : spaces between the solid material that can hold water Grey- matrix Blue-voids or Pore spaces filled With water Matrix: Geologic Materials Unconsolidated sediments Geologic materials made up of individual grains that are not cemented together (e g gravels sands silts clays (e.g. gravels, sands, silts, clays) Rock A solid, cohesive aggregate of grains that are cemented ( lithified ) together. Porosity Porosity is the ratio of the volume of the void space to the total volume of the sediment or solid rock material. Porosity (n) = V voids /V total water Saturated Sand + Dry Sand V total = 1.0 ft 3 V voids = 0.3 ft 3 n=0.3ft 3 /1.0ft 3 =0.3 0<n<1 or n x 100 0.3 x 100 = 30% Types of Sediments Siliciclastics : produced from weathering of pre-existing rocks to produce sands, silts, and clay size materials
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Porosity2012a - Where does your drinking water come from...

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