**Hydrology**

There
are three questions on this exam. They
are of equal credit. Do all three
questions. For questions (1) and (2),
prepare a 2-page typed theme paper.
Question (3) can be answered with a combination of hand computations and
spreadsheet output. *Staple the
three answers together in the order of the questions*, and turn in the
result to the EWRE secretary in ECJ 8.612 by 5PM on Thursday, May 10. This is a take-home exam. You are honor bound not to discuss this exam
with your colleagues in the class. Your
answers should be the result of your work and thought alone. Be assured that if essentially the same idea
appears in answers from more than one person, it is fairly easy to recognize
that when the grading is being done. If
that happens, it is not clear from whom the idea originated and who is just
using somebody else’s knowledge. So,
keep your ideas to yourself!

What
I am looking for in grading your answers is:

·
**Knowledge of the facts.** Make sure you lay out **the facts** of what was covered in the
relevant class lectures and readings before you start speculating about what
could be done or should be done in the future

·
**Thoughtful evaluation.** How do you evaluate the advantages and limitations of the principles,
methods and data that have been used?
How does the knowledge you’ve learned in this class relate to the world
around us? I am looking for a sense of
reflection here, of seeing you set individual situations and facts in a larger
context in an intelligent way.

**1.
****Fundamental Principles of
Hydrology**

Choose
**three core principles or equations** that you consider to be fundamental
to hydrologic analysis. Describe
these principles or equations, explain how they are used and why you chose them
as your core principles or equations.
**Draw a diagram** that relates the other main topics and ideas in
the course to the ones you have selected as your three core principles or
equations. In answering this question,
please keep in mind these factors:

- There is no unique
answer to this question. What I
am looking for is your logic and sense of understanding the course as a
whole, rather than in its parts.
- Cover the whole
course. Don’t choose your three
core principles or equations from one section of the course
- Don’t choose one of
your core principles as a special case of another. The core principles should be
substantially independent of one another

**2.
****Applications of Advanced
Technology in Hydrology**

There
have been a number of presentations in class about the applications of advanced
technologies in hydrology, including lectures on GIS Hydrology on Jan 23, Mar
29, Apr 17, Corps of Engineers simulation models on Mar 20, Mar 27, Mar 29 and
new concepts for urban stormwater on Apr 19 and Apr 26. I would like you to make a summary of the
key ideas that you see emerging that will influence the practice of hydrology
in future years. How will GIS impact
the practice of hydrology? What are
the key national data sets that are being developed to support hydrologic
modeling? What are the capabilities of
new hydrologic simulation models and how can they be linked so that the output
of one can be used as the input of another?
How could these new technologies be implemented by a city to
systematically support hydrologic analysis for many individual land
developments in a city?

**3. Design Storm Rainfall for Lago Vista**

** **

You have been appointed as the drainage engineer for
Lago Vista, Texas, and one of your tasks is to develop a design rainfall estimates
for your city. If you use Spreadsheet
computations to answer this question, be sure to include at least one fully
worked out computation that shows how a point in the spreadsheet was developed. Spreadsheet results alone are insufficient
since you must document the sequence of the work that you did to obtain the
results you present.

Do the following:

(a) Develop intensity-duration-frequency curves for
storms of 5 minutes to 1 hour duration and return periods of 2, 5, 10, 25, 50,
100 years for Lago Vista. Draw a graph
showing these six intensity-duration-frequency curves.

(b) Choose the 25 year return period curve and
develop from this a 1 hour design storm hyetograph in 5 minute increments. In appearance, the result should look
similar to the one for Denver in Figure 14.4.1 of Applied Hydrology.

(c) What is the chance that during the next 10 years
a one hour duration storm will occur having the rainfall depth equaling or
exceeding the value that you’ve determined in (a) and (b)?

** **

*Location
of Lago Vista*