Hydrogeology 101 Introduction to Porosity of Aquifers

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This video introduces the concept of porosity in aquifers, and how it is affected by the compaction and sorting of sediments. It explains why a sandy gravel has a much lower porosity than a gravel or a sand, and also how cementation of the matrix reduces porosity. The techniques of porosity estimation are applied to estimate groundwater resources and groundwater recharge in a cemented gravel aquifer. • 00:00 Introduction • 00:25 Primary porosity • 00:36 Secondary porosity • 00:49 Porosity calculations • 01:44 Range of porosity values • 02:13 Alluvial gravels • 02:52 Effect of packing • 03:15 Effect of grain size • 05:29 Porosity of a sandy gravel • 06:49 Real world example • 08:31 Effect of cementation • 09:08 Groundwater recharge MAR in a cemented gravel • #porosity #aquifer #hydrogeology

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