Thank you! I am a former groundwater conservation district board member. Explaining this concept to residents who had no background in science was a challenge. Now, I live in another Texas county where we are trying to form a groundwater conservation district. I have a feeling that your videos will come in handy!😊
4:55 not sure if i understood you there correctly, but if we have an aquifer with low transmissivity, the cone of depression should be steep and narrow and not broad and shallow? since the water cannot move through the aquifer easily, the pumps will drain out the water close to the well with more drawdown rather than create a large cone
Is recharge rate fixed or is it dependent on the draw down? I would think that with greater draw down youd have a steeper gradient in the cone which would lead to faster recharge. With a small draw the pressure difference isnt that great and it wouldnt draw as much water in.
Yea testing capacity of wells is a huge deal, locally i have actually run into this issue. This is why i asked about the cone of depression since it can easily be overlooked. Our local government department of resources failed to do a area of impact survey before a large community well was drilled. This well was basically done illegally and under the table because the builders were cheap and did not want to drill deeper to a less used aquifer. A well was drilled for a single family home near the development before it was completed. The static water level was 30' at the time the well was put into service and the draw-down was minimal of 15' from a 1hp - 20 gpm submersible pump. A year later when people started moving into the community and the well was in production the home owner called "out of water" We got there to the pump running and not pumping, the water had dropped below the pump! The water-level was now at 50'. Having only 60' of 4" casing for the submersible to drop down in the pump was changed to a 1/2 hp at 10 gpm. Nearly another year goes by and yet another call "out of water". This time the water level had dropped to 70', and the well depth is only 110' here! The community is around a couple 1000' away from this well, and now we had to resort to changing the pump type to a above-ground jet pump with a stinger 20' pipe down the 2" casing. At this point the State Dep. was contacted, they finally called back saying there was nothing they could do. They had no way of proving that the well depth of the community well and the private well were the same. They also said they do not have water level monitoring equipment or funding for such an investigation! I would expect soon for the private well owner to have to drill a deeper well, which deeper water there has a lot of iron which would need filtration not to mention cost more to drill! So basically what your teaching on your channel is very important!
Dane ... this information is fantastic ... is there anyway i can contact you? I have a very interesting groundwater scenario i'm dealing with and I think you will find it interesting and slightly challenging and it will potentially help me out a TON!
I believe You have to find the draw down level. Pumping rate versus recharge rate. Example.....With pump 10gal per min , where is the recharge level to match that . That recharge level will be a point that the recharge level stops , while pumping. Below this point is where the pump goes
Thank you! I am a former groundwater conservation district board member. Explaining this concept to residents who had no background in science was a challenge. Now, I live in another Texas county where we are trying to form a groundwater conservation district. I have a feeling that your videos will come in handy!😊
4:55 not sure if i understood you there correctly, but if we have an aquifer with low transmissivity, the cone of depression should be steep and narrow and not broad and shallow? since the water cannot move through the aquifer easily, the pumps will drain out the water close to the well with more drawdown rather than create a large cone
Yes, exactly!
The given explanation is from deep experience .......
Great explanation, thank you! Can you explain little bit about Darcy's and how it is used for ?
Wow this videos make the topics so easy to understand. thank you
Did you just say f**k ???? 😂😂
i heard 2 🤣
Is recharge rate fixed or is it dependent on the draw down? I would think that with greater draw down youd have a steeper gradient in the cone which would lead to faster recharge. With a small draw the pressure difference isnt that great and it wouldnt draw as much water in.
wonderful video, where can i find calculations concerning these
Yea testing capacity of wells is a huge deal, locally i have actually run into this issue. This is why i asked about the cone of depression since it can easily be overlooked. Our local government department of resources failed to do a area of impact survey before a large community well was drilled. This well was basically done illegally and under the table because the builders were cheap and did not want to drill deeper to a less used aquifer. A well was drilled for a single family home near the development before it was completed. The static water level was 30' at the time the well was put into service and the draw-down was minimal of 15' from a 1hp - 20 gpm submersible pump. A year later when people started moving into the community and the well was in production the home owner called "out of water" We got there to the pump running and not pumping, the water had dropped below the pump! The water-level was now at 50'. Having only 60' of 4" casing for the submersible to drop down in the pump was changed to a 1/2 hp at 10 gpm. Nearly another year goes by and yet another call "out of water". This time the water level had dropped to 70', and the well depth is only 110' here! The community is around a couple 1000' away from this well, and now we had to resort to changing the pump type to a above-ground jet pump with a stinger 20' pipe down the 2" casing. At this point the State Dep. was contacted, they finally called back saying there was nothing they could do. They had no way of proving that the well depth of the community well and the private well were the same. They also said they do not have water level monitoring equipment or funding for such an investigation! I would expect soon for the private well owner to have to drill a deeper well, which deeper water there has a lot of iron which would need filtration not to mention cost more to drill! So basically what your teaching on your channel is very important!
Good job, thanks for the info. That helped understand this better.
Dane ... this information is fantastic ... is there anyway i can contact you? I have a very interesting groundwater scenario i'm dealing with and I think you will find it interesting and slightly challenging and it will potentially help me out a TON!
Thank you.
great thanks dude
how far past the static water level should I drill? my SWL is 42 feet.... yes, drilling my own well on a farm
wells in my area are 10-15 gpm
I believe You have to find the draw down level. Pumping rate versus recharge rate. Example.....With pump 10gal per min , where is the recharge level to match that . That recharge level will be a point that the recharge level stops , while pumping. Below this point is where the pump goes
Us7