Day zero
Upstream
Rectangular Weir
3
3
1.23
ft
in
cfs
5 pts
Head
Flow
10
1.58
in
cfs
5 pts
GW
0.36
cfs
Day
7
5 pts
Length
Head
Flow
0.25
ft
0.83
ft
Downstream
V-notch weir
EFFLUENT TO STREAM
STREAM
GAINING
Q = Qo e at
Downstream
V-notch weir
5 pts
Head
F

Two streams join as shown in the figure below. The flow in stream 1 was measured at 125 cfs. The total dissolved
solids (TDS) concentrations in the streams was also measured near the junction, with C1 = 80 mg/L, C2 = 145 mg/L
and C3 = 120 mg/L.
b.
c.
d.
W

StudyGuide
GroundwaterHydrology
ExamII,2011
1. Aconfinedaquifer20mthickhasastoragecoefficientof1x103andaneffective
porosityof0.25.Thecompressibilityofwateris4.6x1010m2/N.
a) What is the compressibility of the aquifer skeleton (m2/N)?
b) If the aquifer is

Groundwater Hydrology
EXAM III
Study Questions
Initial observations of drawdowns made during a pump test at an observation well show a pattern
that follows the shape of the Theis curve. Later, however, the drawdown values in the
observation well are less

GROUNDWATER HYDROLOGY
Soil Properties and Groundwater Storage
2. Using the definition of void ratio and porosity given in class, show that n = e/(e+1).
Definitions
n
V pore
VT
e
V pore
Vsolid
substitute V pore eVsolid so n
eVsolid
VT
substituteVT Vsolid

Part (d)
K=
ET =
I=
h1=
h2=
L=
5.00E-05
70
20
215.00
200.00
1000.0
cm/s
cm/yr
cm/yr
m
m
m
COMPUTE
K=
I-ET =
I-ET =
I-ET =
(I-ET)/K =
5.00E-07
-50
-1.59E-06
-1.59E-08
-3.17E-02
m/s
cm/yr
cm/s
m/s
[-]
(
h = h12 h12 h22
) Lx + ( I KET ) ( L x ) x
Q K ( h12 h

INPUT
Part (a)
K=
5.00E-05 cm/s
ET =
60 cm/yr
I=
200 cm/yr
h1=
215.00 m
h2=
200.00 m
L=
1000.0 m
COMPUTE
K=
I-ET =
I-ET =
I-ET =
(I-ET)/K =
(
h = h12 h12 h22
5.00E-07
140
4.44E-06
4.44E-08
8.88E-02
m/s
cm/yr
cm/s
m/s
[-]
) Lx + ( I KET ) ( L x ) x
Q K ( h

Part (b)
K=
ET =
I=
h1=
h2=
L=
5.00E-05
60
100
215.00
200.00
1000.0
cm/s
cm/yr
cm/yr
m
m
m
COMPUTE
K=
I-ET =
I-ET =
I-ET =
(I-ET)/K =
5.00E-07
40
1.27E-06
1.27E-08
2.54E-02
m/s
cm/yr
cm/s
m/s
[-]
(
h = h12 h12 h22
) Lx + ( I KET ) ( L x ) x
Q K ( h12 h22