Hydrogeology 101: Storativity in an unconfined aquifer

[@shivpratap3571]

Great, Simply explained, Thanks.

[@GeosearchInternational]

You're welcome Shiv! All the best, Andreas

[@sarthakpapney3125]

Thanks so much for the video You explained everything very well.. 🙏

[@GeosearchInternational]

You are welcome Sarthak! All the best, Andreas

[@sarthakpapney3125]

@@GeosearchInternational Sir I am having this Geohydrology as one of my subjects in the present semester So anything to recommend so that I will learn more about this subject. And also some books recommendation as well. Please..

[@GeosearchInternational]

Dear Sarthak, For a basic introduction please watch my other videos on the Hydrogeology 101 Playlist: kzbin.info/aero/PLp1lK6n-xb5O8RnVhcfYvqy1kzU_5IfDF. I usually also include links to data and information in each video. If there is anything missing, just send me a message. For free Books see: gw-project.org/books/ where you can also get the Groundwater Book by Freeze & Cherry. Another key publication is Kruseman & de Ridder's book on pumping tests: www.hydrology.nl/key-publications/93-analysis-and-evaluation-of-pumping-test-data-1970.html All the best, Andreas

[@sarthakpapney3125]

@@GeosearchInternational Thank you so much sir, it's an honour to talk to you. Namaste 🙏

[@asadullahhaydarziy6838]

Thanks for your video clip it was so useful we will follow you step by step

[@GeosearchInternational]

You are welcome Asadullah!

[@swayamprajnaprusty8920]

sir we know that water is at greater than atmospheric pressure in the confined aquifer. Similarly what will be the pressure of water in an unconfined aquifer ? will it be equal to t or less than 1 ?

[@GeosearchInternational]

Hi Swayam, by definition groundwater will be at atmospheric pressure at the water table. Below the water table the pressure will increase by about 1 bar/1 atmosphere every 10 metres of depth due to the weight of the water. All the best, Andreas

[@swayamprajnaprusty8920]

@@GeosearchInternational thank you sir !!

[@GeosearchInternational]

Welcome!

[@kaleemashraf8324]

Really awsome. Can u share a vedio regarding pump test data analysis...

[@GeosearchInternational]

Thanks Kaleem! I have done videos on Theis and Cooper-Jacob methods of pumping test analysis with Excel tools. Please have a look in the Hydrogeology Playlist: kzbin.info/aero/PLp1lK6n-xb5O8RnVhcfYvqy1kzU_5IfDF All the best, Andreas

[@kaleemashraf8324]

@@GeosearchInternational thank u for your reply...

[@kaleemashraf8324]

@@GeosearchInternational Is aquifer type determined with the help of pump test data analysis.????

[@GeosearchInternational]

Hi Kaleem, we can guess what kind of aquifer it is (unconfined, confined or leaky confined) if we have the geology logs from boreholes, the water strikes from drilling and the static water levels. However, to be 100% sure we need pumping tests with observation wells because we cannot estimate the storativity of an aquifer without observation well data. All the best, Andreas

[@kaleemashraf8324]

@@GeosearchInternational thanks a lot for detail answers.... Well log with depth of water strike is important to understand aquifer type. In confined aquifer SWL is not fluctuate more but unconfine aquifer SWL is fluctuate more and Leaky aquifer SWL increase sometime. Am I right??? How the Sotorativity value will help to solve this problem ??

[@swayamprajnaprusty8920]

"storativity is defined the volume of water that an aquifer releases from storage per unit surface area of aquifer per unit decline in the component of hydraulic head normal to that surface." sir this is the definition of storativity. If it is a volumetric term then how come it is unitless without any unit as cubic cm or litres ?

[@GeosearchInternational]

Hi Swayam, storativity is unitless: m3/m2/m... Maybe better explained in the Storativity video. Of course we can use it to calculate how much water will be released by an aquifer based on the area and drop in hydraulic head. All the best, Andreas