GLGY 401/601
Lab#3 Answer Key
Problem (1) (4 marks)
Hydraulic head (m)
Graph 1. Hydraulic head vs time
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
h1
h3
h5
0
20
40
60
80
100
120
time (min)
Problem (2) (4 marks) (note: t = ∞ may be explained in writing or graphed)
Graph 2. Hydraulic head vs distance
Hydraulic head (m)
1.2
1
t=4
0.8
t=30 min
0.6
t=120 min
0.4
0.2
0
0
20
40
60
Distance (m)
80
100
120
Problem (3) (1mark)
The first non-zero value occurs at t = 5minutes in both cases, however the first
measurable value (≥1cm) occurs at t = 29min when K = 6E-4mmin-1, and at t = 15min
when K = 1.2E-3mmin-1.
Problem (4) (1mark)
When K is changed to 10-4 m/s, the spread sheet values alternate between positive and
negative values. These values increase exponentially over time.