CE 403 Optional FE Review:
Hydrology & Hydraulics
October 8, 2012
Chris Rehmann & Jen Jefferson
No FE review next week!
The required portion of CE 403 begins.
Hydraulic and hydrologic systems
1. Basic hydrology (e.g., infiltration, rainfall, runoff,
detention, flood flows, watersheds)
2. Basic hydraulics (e.g., Manning equation,
Bernoulli theorem, open-channel flow, pipe flow)
3. Pumping systems (water and wastewater)
4. Municipal water distribution systems
5. Reservoirs (e.g., dams, routing, spillways)
6. Groundwater (e.g., flow, wells, drawdown)
7. Sewer collection systems (storm and sanitary)
FE SRH 1: Rainfall-runoff
A 10,000-ft2 parking lot receives 4 in of rainfall.
The curve number is 98. What is the runoff?
a.
b.
c.
d.
0.2 in
1.5 in
3.8 in
4.2 in
FE SRH = F.E. Supplied Reference Handbook (2008)
FE SRH 2: Rainfall-runoff
A 1.2-ha development is to be drained by a storm
sewer, which must be designed for a 10-year storm.
The corresponding IDF curve is shown below. If the
time of concentration is 30 min and the runoff
coefficient is 0.4, what flow should be used to
design the storm sewer?
315 .5
i  0.81
t d  6.19
a. 2x10-5 m3/s
b. 0.2 m3/s
i in cm/h
c. 0.4 m3/s
td in min
d. 1.8 m3/s
FE SRH 3: Groundwater
A confined aquifer of width 750 m has a
transmissivity of 20 m2/d. Piezometers spaced
340 m apart yield heads of 35 m and 33 m.
What is the flow in this aquifer?
a.
b.
c.
d.
88 m3/d
93 m3/d
15,000 m3/d
29,920 m3/d
FE SRH 4: Groundwater
A pump test in an unconfined aquifer is conducted,
and the well is pumped at 150 m3/d. Drawdowns
measured 50 m and 150 m from the well are 5 m
and 1.5 m, respectively. The water table before
pumping is 36 m above the aquifer bottom. What is
the hydraulic conductivity?
a.
b.
c.
d.
0.02 m/d
0.14 m/d
0.52 m/d
1.81 m/d
FE SRH 5: Hydrographs
A unit hydrograph corresponding to 1 cm of
rainfall has a flow of 0 m3/s at t = 0 min, rises to
3 m3/s at t = 60 min, and falls linearly back to 0
m3/s at t = 300 min. What is the area of the
watershed?
a.
b.
c.
d.
2.7 x 10-2 km2
2.7 km2
27 km2
2700 km2
CESE5: Water resources #41
A newly developed 150 ac subdivision is drained by a
straight stream with a uniform cross section that is
rectangular with width of 4 ft and depth of 6 ft. The
stream is overgrown with weeds. The elevation change
is 1.54 ft over a total length of 21+35.69 sta. What is
the geometric slope of the stream?
a.
b.
c.
d.
0.0007 ft/ft
0.001 ft/ft
0.009 ft/ft
0.07 ft/ft
CESE5 = Lindeburg (2000), Civil Engineering Sample Examination, 5th edition
CESE5: Water resources #42
A newly developed 150 ac subdivision is drained by a
straight stream with a uniform cross section that is
rectangular with width of 4 ft and depth of 6 ft. The
stream is overgrown with weeds. The elevation change
is 1.54 over a total length of 21+35.69 sta. What is
Manning’s coefficient for the stream?
a.
b.
c.
d.
0.017
0.025
0.035
0.060
CESE5: Water resources #43
A newly developed 150 ac subdivision is drained by a
straight stream with a uniform cross section that is
rectangular with width of 4 ft and depth of 6 ft. The
stream is overgrown with weeds. The elevation change
is 1.54 over a total length of 21+35.69 sta. What is the
capacity of the stream with flowing full?
a.
b.
c.
d.
36 cfs
59 cfs
73 cfs
120 cfs
CESE5: Water resources #44
A peak post-development flow of 138 cfs is expected to
leave the site. Since this exceeds the stream’s capacity,
a trapezoidal earth channel will be produced by
excatvating the sides of the stream. All vegetation and
debris will be removed, but the depth and base width
will be unchanged. The earthen walls will be
compacted. What should the maximum side slope (H:V)
be for the channel?
a.
b.
c.
d.
0.5:1
1.5:1
3:1
4:1
CESE5: Water resources #45
A side slope of 1.5:1 (H:V) is used with n= 0.018.
What is the normal depth of flow when carrying the
peak flow of 138 cfs?
a.
b.
c.
d.
3.2 ft
3.9 ft
4.8 ft
5.3 ft
CESE5: Water resources #46
If the depth of flow is 4.1 ft, what is the velocity
when carrying the peak flow?
a.
b.
c.
d.
2.5 ft/s
3.0 ft/s
3.7 ft/s
4.9 ft/s
CESE5: Water resources #47
The capacity of the trapezoidal channel flowing
completely full is most nearly
a.
b.
c.
d.
230 cfs
360 cfs
410 cfs
490 cfs
CESE5: Water resources #48
The critical depth in the trapezoidal channel for a
discharge of 138 cfs is most nearly
a.
b.
c.
d.
1.5 ft
2.5 ft
2.9 ft
3.0 ft
CESE5: Water resources #49
If the earthen trapezoidal channel is lined with
riprap such that the area in flow does not change,
the most likely effect will be
a.
b.
c.
d.
Increased depth and capacity
Increased depth and decreased capacity
Decreased depth and increased capacity
Decreased depth and decreased capacity
CESE5: Water resources #50
Manning’s roughness coefficient for a riprap-lined
channel is most nearly
a.
b.
c.
d.
0.018
0.025
0.035
0.050