Can you make a video on the Theis Equation? UA-cam does not have a good video for geologists, just engineers and you have a great way of making things so much easier to understand.
I am on a karst formation by a lake. Noticed my test holes across the bottom of the bluff, water is at same level no matter what soil layer. I have seen it seeping at burnt bluff sandstone, also running under top soil with white sand and burnt buff dry. By the sink the white sand is saturated and thicker layer of white sand. Downhill in the sink there is 2 springs both coming up rotten tree roots. There are areas that have not sunk along the boundary. The seep holes I have dug do fill and overflow. Other lakes west of the karst are recharge plus sink holes filled with glacial till along cracks on bluff. I have dug down 6 feet chasing the springs. At that level I am pulling up fractured pieces of sandstone. Never did improve spring flow in hopes of cleaning out thicker layer of top soil out of the sink. Trying to put down a driven point well and hoping for a flowing well. Thanks for the videos they have been a great help in understanding the hydrology.
Maybe you can make the next video about permeability k (lowercase letter). In fact we have that the Hydraulic Conductivity K (uppercase letter) is K = (𝜌 g k) / μ. Thanks for your videos! :D
Hi Dane, Thank you for all the videos. You explain really well. You think you could get some content done on groundwater modelling for beginners? Modflow or IGW
Hi Dane, I believe your depiction of boundaries is incorrect. Drawdown does not 'recover' due to hitting a constant head boundary. Instead the drawdown is less then what would be predicted by the Theis equation, which assumes infinite unbounded extents of the aquifer. Please take a look at Pages 330-331 from Freeze and Cherry (1979) for a proper depiction of how to account for boundaries.
@@daneandersen8181 Yes you're right the rate of drawdown would decrease when encountering a recharge boundary, but relative to what? The rate of drawdown would decrease relative to an unbounded aquifer. An overall explanation should start with an explanation of the Theis solution listing all its assumptions. Then explaining the situations that a hydrogeologist may encounter that violate those assumptions (e.g., boundary conditions, leaky aquifers, unconfined aquifers, etc.).
@@reynoldchow2289this video was more of a qualitative approach to what you might see in an aquifer test than an explanation of and comparison to assumptions made in the Theis solution. Maybe you should make that video!
Can you make a video on the Theis Equation? UA-cam does not have a good video for geologists, just engineers and you have a great way of making things so much easier to understand.
yeah i should do that... will do when i get some time!
@@daneandersen8181 Thank you so much. Your videos have really helped with supplemental material for the ASBOG test.
Very clear and interesting videos. Looking forward to your next one.
I am on a karst formation by a lake. Noticed my test holes across the bottom of the bluff, water is at same level no matter what soil layer. I have seen it seeping at burnt bluff sandstone, also running under top soil with white sand and burnt buff dry. By the sink the white sand is saturated and thicker layer of white sand. Downhill in the sink there is 2 springs both coming up rotten tree roots. There are areas that have not sunk along the boundary. The seep holes I have dug do fill and overflow. Other lakes west of the karst are recharge plus sink holes filled with glacial till along cracks on bluff. I have dug down 6 feet chasing the springs. At that level I am pulling up fractured pieces of sandstone. Never did improve spring flow in hopes of cleaning out thicker layer of top soil out of the sink. Trying to put down a driven point well and hoping for a flowing well. Thanks for the videos they have been a great help in understanding the hydrology.
Maybe you can make the next video about permeability k (lowercase letter). In fact we have that the Hydraulic Conductivity K (uppercase letter) is K = (𝜌 g k) / μ. Thanks for your videos! :D
Thanks thanks thanks for your videos!!
Your videos are really helpful! Thank you very much!
Hope you keep doing great things ❤
You helped me a lot, thank you sir ✨
Hey, Thanks for share with us your greats videos! :)
Im waiting for your next video!
Great job. Please just want to find out.....in the case of a fault boundary, the effect is not necessarily symmetrical on the flow, right?
correct - if theres a fault (impermeable boundary) to the east, for example, you would see increased drawdown to the east
cool
Hi Dane, Thank you for all the videos. You explain really well. You think you could get some content done on groundwater modelling for beginners? Modflow or IGW
yeah that would be a good idea, will try to get one done when i get some free time!
Which app are you using to create videos like this? Please reply
sir explain about headloss plzz...
Hi Dane, I believe your depiction of boundaries is incorrect. Drawdown does not 'recover' due to hitting a constant head boundary. Instead the drawdown is less then what would be predicted by the Theis equation, which assumes infinite unbounded extents of the aquifer. Please take a look at Pages 330-331 from Freeze and Cherry (1979) for a proper depiction of how to account for boundaries.
You're right, but i think my overall explanation is still correct. the rate of drawdown decreases when you hit a recharge boundary.
@@daneandersen8181 Yes you're right the rate of drawdown would decrease when encountering a recharge boundary, but relative to what? The rate of drawdown would decrease relative to an unbounded aquifer. An overall explanation should start with an explanation of the Theis solution listing all its assumptions. Then explaining the situations that a hydrogeologist may encounter that violate those assumptions (e.g., boundary conditions, leaky aquifers, unconfined aquifers, etc.).
@@reynoldchow2289this video was more of a qualitative approach to what you might see in an aquifer test than an explanation of and comparison to assumptions made in the Theis solution. Maybe you should make that video!
hi dane i need to get contact with you >>could you accept linked-in request