04TypeCurves.pptx

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Ali Al-naqa

Engineering

ESS 454
Hydrogeology
Module 4
Flow to Wells
• Preliminaries, Radial Flow and Well Function
• Non-dimensional Variables, Theis “Type”
curve, and Cooper-Jacob Analysis
• Aquifer boundaries, Recharge, Thiem equation
• Other “Type” curves
• Well Testing
• Last Comments
Instructor: Michael Brown
brown@ess.washington.edu

Learning Objectives
 Forward problem: Understand how to use the Hantush-
Jacob formula to predict properties of a confined aquifer
with leakage
 Inverse problem: Understand how to use Type curves for
a leaky confined aquifer to determine T, S, and B
 Understand how water flows to a well in an unconfined
aquifer
o Changes in the nature of flow with time
o How to use Type curves

Other Type-Curves
Given without Derivations
1. Leaky Confined Aquifer
• Hantush-Jacob Formula
• Appendix 3 of Fetter
ho -h =
Q
4pT
W(u,r B)
B =
Tb'
K ' “Type Curves” to determine T, S, and r/B
Drawdown reaches
“steady-state” when
recharge balances flow
Larger r/B -> smaller steady-state drawdown
Same curve matching exercise as with
Theis Type-curves
New dimensionless number
Large K’
makes r/B
large

Other Type-curves –
Given without Derivations
2. Unconfined Aquifer
• Neuman Formula
• Appendix 6 of Fetter
ho -h =
Q
4pT
W(uA,uB,G)
G =
r2
Kv
b2
Kh
uA =
r2
S
4Tt
uB =
r2
Sy
4Tt
Similar to Theis but more complicated:
1. Initial flow from elastic storage - S
2. Late time flow from gravity draining – Sy
• Remember: Sy>>S
3. Vertical and horizontal flow –
• Kv may differ from Kh
Three non-dimensional variables
Initial flow
from Storativity
Later flow from
gravity draining
Difference between
vertical and horizontal
conductivity is
important

Flow in Unconfined Aquifer
surface
Flow
from
elastic
storage
Vertical flow (gravity draining)
Horizontal flow induced by gradient in head
1. Elastic Storage
Time order
2. Flow from gravity
draining and
horizontal head
gradient
Start Pumping

Other Type-curves –
Given without Derivations
Two-step curve matching:
1. Fit early time data to A-
type curves
2. Fit late time data to B-
type curves
2. Unconfined Aquifer
• Neuman Formula
• Appendix 6 of Fetter
Theis curve using Elastic Storage
Theis curve using Specific Yield
Transition depends on ratio r2Kv/(Khb2)
Sy=104*S
Sy=103*S

The End: Other Type Curves
Coming up: Well Testing

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04TypeCurves.pptx

1. ESS 454 Hydrogeology Module 4 Flow to Wells • Preliminaries, Radial Flow and Well Function • Non-dimensional Variables, Theis “Type” curve, and Cooper-Jacob Analysis • Aquifer boundaries, Recharge, Thiem equation • Other “Type” curves • Well Testing • Last Comments Instructor: Michael Brown brown@ess.washington.edu

2. Learning Objectives  Forward problem: Understand how to use the Hantush- Jacob formula to predict properties of a confined aquifer with leakage  Inverse problem: Understand how to use Type curves for a leaky confined aquifer to determine T, S, and B  Understand how water flows to a well in an unconfined aquifer o Changes in the nature of flow with time o How to use Type curves

3. Other Type-Curves Given without Derivations 1. Leaky Confined Aquifer • Hantush-Jacob Formula • Appendix 3 of Fetter ho -h = Q 4pT W(u,r B) B = Tb' K ' “Type Curves” to determine T, S, and r/B Drawdown reaches “steady-state” when recharge balances flow Larger r/B -> smaller steady-state drawdown Same curve matching exercise as with Theis Type-curves New dimensionless number Large K’ makes r/B large

4. Other Type-curves – Given without Derivations 2. Unconfined Aquifer • Neuman Formula • Appendix 6 of Fetter ho -h = Q 4pT W(uA,uB,G) G = r2 Kv b2 Kh uA = r2 S 4Tt uB = r2 Sy 4Tt Similar to Theis but more complicated: 1. Initial flow from elastic storage - S 2. Late time flow from gravity draining – Sy • Remember: Sy>>S 3. Vertical and horizontal flow – • Kv may differ from Kh Three non-dimensional variables Initial flow from Storativity Later flow from gravity draining Difference between vertical and horizontal conductivity is important

5. Flow in Unconfined Aquifer surface Flow from elastic storage Vertical flow (gravity draining) Horizontal flow induced by gradient in head 1. Elastic Storage Time order 2. Flow from gravity draining and horizontal head gradient Start Pumping

6. Other Type-curves – Given without Derivations Two-step curve matching: 1. Fit early time data to A- type curves 2. Fit late time data to B- type curves 2. Unconfined Aquifer • Neuman Formula • Appendix 6 of Fetter Theis curve using Elastic Storage Theis curve using Specific Yield Transition depends on ratio r2Kv/(Khb2) Sy=104*S Sy=103*S

7. The End: Other Type Curves Coming up: Well Testing

04TypeCurves.pptx

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04TypeCurves.pptx