Name:_____________________________
CE 394K Hydrology Final Exam Fall 1996
There are three questions on this exam. They are of equal value.
You may use your class notes, text, homework solutions and other
reading materials to do this exam.
Before doing the exam, please read and sign the following statement:
I will do this examination without assistance from anyone else,
and without discussing any aspect of it with my classmates.
Signature: ________________________________
The text of this examination can be found on internet at:
http://www.ce.utexas.edu/prof/maidment/ce394k/ce394k.fin
The electronic file used to prepare this text can be found at
ftp.crwr.utexas.edu
under directory /pub/hydclass
from which it can be downloaded via anonymous ftp as:
Word 7.0 format final.doc
Rich Text format final.rtf
Hypertext Markup Language (html) final.htm
If you wish to download one of these files so that you can prepare
your solution electronically, that is fine, but I will not grade
a solution that is longer than 6 pages, or 2 pages per question.
I want your examination solution turned in on paper by 5PM
on Thursday 12 December in the box outside my office at ECJ
8.6. Because of potential complications with file conversions
and the lack of time I will have to deal with them, I do not want
your solution to be submitted electronically.
If you are unclear as to what I am asking on one of the questions
or want some other clarification about what you can do on this
examination, please email me at
maidment@crwr.utexas.edu.
Question 1.
This semester we have studied the water balance at the land
surface and the flow of water and the transport of constituents
through the landscape. For each of the following topics I want
you to identify the most important equation or principle that
we studied. In each case, write the equation or define the principle
and state briefly why you selected this equation or principle
instead of alternatives that you might have chosen.
 Hydrologic cycle, control volumes, hydrologic system
 Continuity and momentum
 Energy balance, atmospheric circulation, water vapor flow
 Precipitation formation and measurement
 Evaporation
 Infiltration and soil water movement
 Transport of chemicals and sediment
 Storm runoff
 Groundwater flow
 Flow in rivers
 Nonpoint source pollution
 Mapbased hydrologic modeling
Question 2.
Select a particular geographic area with which you are familiar
and pose a hydrologic problem that you wish to solve concerning
that area. Try to make your problem as realistic as possible.
Draw a sketch of the area.
Define the problem that you wish to solve.
Specify the important variables in your problem and the spatial
and temporal domain of your solution. How many values of these
variables are going to be determined at what spatial locations
and at what points in time?
What equations or methods are you going to use to solve your
problem?
How will you determine the values of the physical parameters
required by these equations or methods?
Present the solution to the problem. If you need to make
up some synthetic input data to make the solution realistic, do
so.
Make an assessment of your solution. What are its limitations
and weaknesses? If you were working as an engineer in a normal
professional environment, how would you improve your solution?
Question 3
Part (a)
A storm of 5 inches of rainfall occurs in two hours on
a 1 square mile watershed having an SCS curve number of 85 and a time of concentration
of 45 minutes. Determine the runoff hydrograph at the outlet
of this watershed. What is the peak discharge of this hydrograph?
Part (b)
A flood hydrograph is recorded with the following discharges
at point A on a river:
Time (hr)  0  1  2  3 
4  5  6  7  8  9  10

Flow (cfs)  10000  20000  30000 
40000  35000  30000  25000  20000
 15000  10000  10000 
Determine the discharge hydrograph at a point B, 20 miles downstream of point A,
if there is no significant lateral inflow between the two points,
the channel is approximately rectangular in shape with width =
250 ft, Mannings n = 0.045, and slope = 0.5 percent. The initial discharge
in the channel is 10,000 cfs throughout the length of the channel.
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