Sir, I found your lecture the best one. Sir, I repeat the best ever....I will never forget these terms of Ground water hydrology. Your way of teaching is absolutely outstanding sir TYSM
I have nothing to say except commenting out that your way of teaching is unusual and I don't think there might be someone to worry about your lessons. you're making our university lives much simpler.
This is absolutely, perfect explanation! I ever watched. My understanding to these terms were totally wrong until I watched your video. Thank you so much.
Your teaching method is so impressive.. You deserve something more 🙏🙏.. Thank you so much.. And It is so nice that you reply to everyone who comments and hope you will give comments to it 😅
Brilliant, keep teaching good sir! I find the best teachers are always hesitant, but its rare you find one who can just throw it out there effortless and keenly with real examples.
Thanks for your kind words Skiidzman! There is a saying that only when you try to teach something, you get to fully understand it. All the best, Andreas
Hi dear Andreas! I'm rohullah sediqi form kabul,Afghanistan and i was hydrogeologist in the Northeast of Afghanistan at the MRRD_WASIP. Now I'm studying master's degree in information and technology in subsoil use in Russia, i gonna watch all of videos furthermore hope that you can help me with some projects you have done in Afghanistan.
Hi Rohullah, Thanks for your message & congrats for starting your MSc. Regarding data from Afghanistan, any open source data - that is information which has been published on the internet is free to share and if I know the source I will try to help you. All other data is owned by the various clients and institutions, so if you need that information you would need to contact them directly. All the best, Andreas
Thanks Soumen! I'm happy if you find it useful. I see from your RUclips channel that you are interested in quarries. Soon I will make a new video which will explain how you can monitor the growth of quarries quickly & easily (& free) using the European Space Agency Sentinal-2 data. Greetings from Spain to India, Andreas
If you have any questions related to the video, I can try to answer them. For other issues, I'm sorry but I'm too busy at the moment. All the best, Andreas
You are welcome. I'm planning to start hydrology videos at some stage, but probably after I have made some on water resources issues using QGIS for which I have already received many requests. Best regards, Andreas
Great teaching and explanation. Very helpful! Please answer the question, whether it is necessary to pre-dry the sand of it has some moisture (30%) in its natural state ?
Hi Акыл, Glad you found it useful. The sandy gravel sample in the video is from a river bank and it was completely dry already when I collected it, so I did not pre-dry it. If your sample is wet, and you let the water drain away the maximum water it will contain will be the specific retention - what is stuck to the sand/gravel grains by capillary attraction. In this case it was about 5%. So yes, if you want to do a proper scientific job, you should make sure that the sample is dry. All the best, Andreas
Hi Afor Odama! Glad you liked the video. Actually this video is just to explain the principles, so I just waited a few minutes till the water stopped draining out of the sandy gravel. Normally what we are interested in is the specific yield - how much water we can drain from an unconfined aquifer. For this we need pumping tests with observation wells, and for unconfined aquifers it is usually recommended to pump for 72 hours to get past the "delayed yield' part of the drawdown curve.
@@GeosearchInternational I will be looking forward to it sir. I just subscribed to your channel so I can get a notification when the video gets posted. Thank you so much.
Hi Stephen, It is a pint glass but I don't know if it is standard or not. I measured the volume by weighing it while empty & then full of water right to the brim. Assumed that the water weighs 1 kg/L or 1 g/cm3, the difference in weight can then be used to calculate the volume of the glass. All the best, Andreas
I'm glad you like it. Sure you can contact me - you can find my e-mail in the 'About' section on the right of the channel home page. All the best, Andreas
Dear Gholam, "Safe Yield" is an old term to describe how much groundwater can be abstracted from an aquifer without mining it. I would prefer to use the term "sustainable yield", because "safe" has implications of safety. If you abstract groundwater from an aquifer you can do so sustainably if there is a balance between recharge and discharge. Recharge from precipitation or irrigation occurs once the soil moisture is satisfied. Of course we can also get recharge from surface water bodies like rivers and canals, or even from other aquifers. Natural discharge from an aquifer happens all the time, and it is controlled by Darcy's Law. It is what keeps rivers flowing during the dry season. I will try to make some videos about water balance in river basins this year. In the meantime have a look at: ruclips.net/video/9Wmkugy3XdQ/видео.html All the best, Andreas
Dear Gholam, I will make some videos about it soon. Basically you need to estimate all the inflows and outflows of your river basin over at least one year. Some things we can measure ( e.g. precipitation, stream discharge), other things we can estimate (e.g. pumping rates), and other things are more difficult (e.g. actual evapotranspiration). Things have changed a lot since we have better remote sensing data so the whole water balance exercise is becoming much easier. All the best, Andreas
According to Google: "It means "introductory something". The allusion is to a college course with the course code 101, which in the American system and probably others indicates an introductory course, often with no prerequisites."
this is genuinely more clear than review books and lectures. thank you
Thanks Javier, glad you liked the video! All the best, Andreas
Sir, I found your lecture the best one.
Sir, I repeat the best ever....I will never forget these terms of Ground water hydrology.
Your way of teaching is absolutely outstanding sir TYSM
It's my pleasure. All the best, Andreas
I have nothing to say except commenting out that your way of teaching is unusual and I don't think there might be someone to worry about your lessons.
you're making our university lives much simpler.
Thank you for your kind words Amidu! All the best, Andreas
This is absolutely, perfect explanation! I ever watched. My understanding to these terms were totally wrong until I watched your video. Thank you so much.
You're very welcome Abas! All the best, Andreas
Your teaching method is so impressive.. You deserve something more 🙏🙏.. Thank you so much.. And It is so nice that you reply to everyone who comments and hope you will give comments to it 😅
It's my pleasure Pratyush! All the best, Andreas
I've watched your whole set of Hydro 101 videos. Hats off Sir!
Saludos desde España!
Hola Adriana, that's a big effort! Thank you!
Un saludo desde Altea, Andreas
Brilliant, keep teaching good sir! I find the best teachers are always hesitant, but its rare you find one who can just throw it out there effortless and keenly with real examples.
Thanks for your kind words Skiidzman! There is a saying that only when you try to teach something, you get to fully understand it.
All the best, Andreas
Amazing lecture with a great didactic. Thank you for sharing this work!
Most welcome Pedro! All the best, Andreas
Hi dear Andreas!
I'm rohullah sediqi form kabul,Afghanistan and i was hydrogeologist in the Northeast of Afghanistan at the MRRD_WASIP. Now I'm studying master's degree in information and technology in subsoil use in Russia, i gonna watch all of videos furthermore hope that you can help me with some projects you have done in Afghanistan.
Hi Rohullah, Thanks for your message & congrats for starting your MSc. Regarding data from Afghanistan, any open source data - that is information which has been published on the internet is free to share and if I know the source I will try to help you. All other data is owned by the various clients and institutions, so if you need that information you would need to contact them directly. All the best, Andreas
This is way perfect, impeccable, crystal clear, awesome, to teaching sir 🙏
Thanks for your kind words Satheesh! All the best, Andreas
Thank you sir. Thank you for taking your time to help other people.
It's my pleasure! All the best, Andreas
Thank you so much. You are my saviourand i shall never forget the concepts☺❤❤❤
You're welcome Alboni! All the best, Andreas
Simply excellent lecture!
Thanks Monim! All the best, Andreas
Fantastic video; thank you so much! Using an example of the sandy gravel really helped :)
Glad you found it useful Grace! All the best, Andreas
Thank you for sharing, and explain the hydogeogoly in a entertained way.
Glad you enjoyed it William! All the best, Andreas
Thank you, incredible explanation
You're very welcome! All the best, Andrea
Impeccable explanation sir
Thanks you so much sir
Most welcome Satheesh! All the best, Andreas
Thank you so so much sir. Your explanation is great.
Thanks for your kind words Majidhussain! All the best, Andreas
Awesome explaination with live examples.
Glad you liked it! All the best, Andreas
Thank you that was very helpful ❤
You’re welcome!
so easy to understand...thanks
You are welcome! All the best, Andreas
Thank you for your explanation
You are welcome Qadr! All the best, Andreas
Excellent explaination
Thanks for your kind words! All the best, Andreas
you made it so easy to understand ❤
Thanks Shubham for your kind words! All the best, Andreas
Best lecture with full concept sir..From India
Thanks Soumen! I'm happy if you find it useful. I see from your RUclips channel that you are interested in quarries. Soon I will make a new video which will explain how you can monitor the growth of quarries quickly & easily (& free) using the European Space Agency Sentinal-2 data. Greetings from Spain to India, Andreas
OK sir....
Sir I want to talk with you some issue ...I hope you will be help me...jsoumen55@gmail.com....This is my mail I'd ...Sir please give me your contact..
If you have any questions related to the video, I can try to answer them. For other issues, I'm sorry but I'm too busy at the moment. All the best, Andreas
@@GeosearchInternational
Sir I want to join as civil I your country can you help me sir
Another excellent video!
Glad you like it! All the best, Andreas
Lovely explaination 😍
Thank you! All the best, Andreas
Very effective. Great job. Thanks.
Thanks Andrew! Much appreciated. All the best, Andreas
Great presentation
Glad you liked it @mhick3333! all the best, Andreas
Very clear explanation 👏👏👏
and
I need the explanation of computing peak flood discharge by all methods including unit hydrograph method please....
You are welcome. I'm planning to start hydrology videos at some stage, but probably after I have made some on water resources issues using QGIS for which I have already received many requests. Best regards, Andreas
Very good explanation sir...
Thanks and welcome! All the best, Andreas
Thanks for sharing. Very helpful.
You are welcome!
Great teaching and explanation. Very helpful! Please answer the question, whether it is necessary to pre-dry the sand of it has some moisture (30%) in its natural state ?
Hi Акыл, Glad you found it useful. The sandy gravel sample in the video is from a river bank and it was completely dry already when I collected it, so I did not pre-dry it. If your sample is wet, and you let the water drain away the maximum water it will contain will be the specific retention - what is stuck to the sand/gravel grains by capillary attraction. In this case it was about 5%.
So yes, if you want to do a proper scientific job, you should make sure that the sample is dry. All the best, Andreas
beautifuly explained
Thank you Mehr! 🙂 All the best, Andreas
Thanks for the video
Most welcome Oybek! All the best, Andreas
Thank you so much
You're most welcome! All the best, Andreas
excellent thanks
You are welcome Melki! All the best, Andreas
Very appreciated 👌
You are welcome Hamza! All the best, Andreas
so good
Thanks Aniounz! all the best, Andreas
Thank you sir ❤️
Most welcome! All the best, Andreas
Super explain
Glad you liked it
This video is very helpful. Do we need to have specific times that the drainage process should last before we measure the specific retention?
Hi Afor Odama! Glad you liked the video. Actually this video is just to explain the principles, so I just waited a few minutes till the water stopped draining out of the sandy gravel. Normally what we are interested in is the specific yield - how much water we can drain from an unconfined aquifer. For this we need pumping tests with observation wells, and for unconfined aquifers it is usually recommended to pump for 72 hours to get past the "delayed yield' part of the drawdown curve.
@@GeosearchInternational Thank you so much for your kind suggestions. They will go a long way.
You are welcome! I'm making some new videos on pumping tests at the moment, so will cover this question in more detail soon. All the best, Andreas
@@GeosearchInternational I will be looking forward to it sir. I just subscribed to your channel so I can get a notification when the video gets posted. Thank you so much.
I am a bit behind. Is the volume of a glass standard or they're some calculations?
Hi Stephen, It is a pint glass but I don't know if it is standard or not. I measured the volume by weighing it while empty & then full of water right to the brim. Assumed that the water weighs 1 kg/L or 1 g/cm3, the difference in weight can then be used to calculate the volume of the glass. All the best, Andreas
@@GeosearchInternational thank you so much. I am enjoying your lessons Andreas. Can it be okay to contact you via mail?
I'm glad you like it. Sure you can contact me - you can find my e-mail in the 'About' section on the right of the channel home page. All the best, Andreas
question.
What is the Safe Yield system ?
When does Discharge and recharge occur ?
Dear Gholam,
"Safe Yield" is an old term to describe how much groundwater can be abstracted from an aquifer without mining it. I would prefer to use the term "sustainable yield", because "safe" has implications of safety. If you abstract groundwater from an aquifer you can do so sustainably if there is a balance between recharge and discharge. Recharge from precipitation or irrigation occurs once the soil moisture is satisfied. Of course we can also get recharge from surface water bodies like rivers and canals, or even from other aquifers. Natural discharge from an aquifer happens all the time, and it is controlled by Darcy's Law. It is what keeps rivers flowing during the dry season. I will try to make some videos about water balance in river basins this year. In the meantime have a look at: ruclips.net/video/9Wmkugy3XdQ/видео.html
All the best, Andreas
@@GeosearchInternational
Thanks so much my friend.
It was very informative.
I want to Research on groundwater and how can we make balance.
Dear Gholam, I will make some videos about it soon. Basically you need to estimate all the inflows and outflows of your river basin over at least one year. Some things we can measure ( e.g. precipitation, stream discharge), other things we can estimate (e.g. pumping rates), and other things are more difficult (e.g. actual evapotranspiration). Things have changed a lot since we have better remote sensing data so the whole water balance exercise is becoming much easier. All the best, Andreas
@@GeosearchInternational
I am waiting for that video. It will be amazing.
You always clearly explain like before videos ❤
Thanks Gholam, I'll try my best! Andreas
❤
Welcome! All the best, Andreas
what does it mean 101 ?
According to Google: "It means "introductory something". The allusion is to a college course with the course code 101, which in the American system and probably others indicates an introductory course, often with no prerequisites."
See the link: www.mentalfloss.com/article/53734/why-are-introductory-classes-called-101
Godly🫂
Thanks Dilraj! All the best, Andreas