Hydrogeology 101: Storativity

This video is about the storativity (S) of aquifers, also known as the storage coefficient. Storativity is a key parameter which we need for groundwater resources studies. We will look at the key concepts of storativity in unconfined aquifers - specific yield (Sy) & specific retention (Sr), and confined aquifers - specific storage (Ss) & storativity (S). In confined aquifers we will discuss the concepts of aquifer compressibility (total stress, effective stress & pore fluid stress) and water compressibility. We will do an example calculation of storativity for a sandy gravel aquifer using published alpha & beta values.

00:00 Introduction
01:13 Definition of storativity
01:38 Specific yield in an unconfined aquifer
03:25 Storativity in a confined aquifer
05:19 Definition of specific storage
06:19 Definition of storativity
07:07 Typical ranges of storativity in confined aquifers
07:59 Sources of water when confined aquifers are decompressed
08:17 Mechanism 1: Compression of the aquifer
11:54 Definition of compressibility (alpha)
12:26 Mechanism 2: Expansion of water
12:54 Definition of water compressibility (beta)
13:10 Equations for specific storage (Ss) and storativity (S)
15:45 Summary and conclusions

Link to Excel Storativity Calculator: https://bit.ly/3wkPFlx

This is an educational video & part of the Hydrogeology 101 course.

#Hydrogeology #Storativity #StorageCoefficient