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California State University, Sacramento Week 10: Thiem equation (steady-state flow, drawdown estimates using two observation wells); partial penetration, well interference, flow boundaries, image wells |
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California State University, Sacramento Week 10: Thiem equation (steady-state flow, drawdown estimates using two observation wells); partial penetration, well interference, flow boundaries, image wells |
Objectives:
Upon completion of this unit students should be able to:
- Distinguish between steady-state and non steady-state flow.
- Estimate drawdown using the Thiem equation: steady-state flow, two observation wells.
- Discuss the problems with an analytical solution for non steady-state flow in an unconfined aquifer.
- Use a mathematical definition for partial penetration.
- Estimate drawdown with more than one extraction well in the zone of influence.
- Define constant head and no flow boundaries in a model.
- Create image wells to model injection, withdrawal and flow boundaries.
Reading Assignments:
Lecture 14: Fetter, pp. 188-190, 207-209
Lecture 15: Fetter, pp. 163-189
Lecture notes:
Lecture 14
Homework Assignment:
Homework Assignment: Topic:Steady state flow in a pumped well with two observation wells- confined and unconfined solutions.Assignment: Fetter, p. 148 #9, p. 216, #1, #13
Due date: Monday Nov. 5
Homework solution:
Grading:
10 points: List all equations and conversions, draw a diagram if requested in the problem.
20 points: Calculations, substitutions, conversions
20 points: Obtain correct answer, including conversions and correct use of significant figures (subtract 2-5 points for each math error or incorrect use of significant figures).
