<p>I think your confusion is because you are keeping the head fixed. As you increase Q at fixed T the drawdown curve will become steeper when r1, h1, and h2 are fixed. That means r2 will move towards the pumping well.</p>

CC BY-SA 4.0
2018-07-09T04:21:58.390Z
2018-07-09T04:21:58.390Z
haresfur
<p>I am using the following equation (Theim/Dupuit) to determine radius of influence for an unconfined aquifer. 
<a href="https://i.sstatic.net/e4lDm.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/e4lDm.png" alt="enter image description here"></a></p>

<p>Assume all other variables are held constant. If Q increases, does the Radius of influence R2 also increase? </p>

CC BY-SA 4.0
2018-07-01T22:41:49.767Z
Is this homework or for a class? Have you tried rearranging the equation to solve for r2?
haresfur
CC BY-SA 4.0
2018-07-02T12:46:43.617Z
Fred, I apologize if you do not feel this is an earth science question... my question is not about the math...I have rearranged the equation and solved for r2, but it seems that as Q increases, r2 decreases. it is an aquifer drawdown question... If flowrate (Q) is increased, what happens to radius of influence (increase? or decrease?).
sjp813
CC BY-SA 4.0
2018-07-02T22:48:47.910Z
I think your confusion is because you are keeping the head fixed. As you increase Q at fixed T the drawdown curve will become steeper when r1, h1, and h2 are fixed. That means r2 will move towards the pumping well.
haresfur
CC BY-SA 4.0
2018-07-08T22:48:52.237Z
@haresfur can you enter your answer in the box below so this question can be marked as answered?
g.z.
<hydrology><groundwater><hydrogeology>
Hydrology - Flowrate vs. radius of influence
sjp813
# Hydrology - Flowrate vs. radius of influence

(Asked by: username_0 on 2018-07-01)

I am using the following equation (Theim/Dupuit) to determine radius of influence for an unconfined aquifer.
[![enter image description here](https://i.sstatic.net/e4lDm.png)](https://i.sstatic.net/e4lDm.png)

Assume all other variables are held constant. If Q increases, does the Radius of influence R2 also increase?

**Tags:** hydrology, groundwater, hydrogeology

> **Comments:**
> **username_1**: Is this homework or for a class? Have you tried rearranging the equation to solve for r2?  
> **username_0**: Fred, I apologize if you do not feel this is an earth science question... my question is not about the math...I have rearranged the equation and solved for r2, but it seems that as Q increases, r2 decreases. it is an aquifer drawdown question... If flowrate (Q) is increased, what happens to radius of influence (increase? or decrease?).  
> **username_1**: I think your confusion is because you are keeping the head fixed. As you increase Q at fixed T the drawdown curve will become steeper when r1, h1, and h2 are fixed. That means r2 will move towards the pumping well.  
> **username_2**: @username_1 can you enter your answer in the box below so this question can be marked as answered?  

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## 1 answers

### Answer by username_1 on 2018-07-09. Score: 2

I think your confusion is because you are keeping the head fixed. As you increase Q at fixed T the drawdown curve will become steeper when r1, h1, and h2 are fixed. That means r2 will move towards the pumping well.


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