ENGR 313 Hydrology
Final Exam
December 12, 2011
Page 1 of 5
Name: _
Final Exam (Open Book)
(Open Book, open notes, 120 points possible)
Note: Points for each problem are shown. Evaluate and use your time accordingly! Be sure
to show your work in order to

ENGR 313 Hydrology
Exam No. 1
September 29, 2011
Page 1 of 4
Name: _
Exam No. 1
(Open Book Portion, open notes, 80 points possible)
Note: Points for each problem are shown. Evaluate and use your time accordingly! Be
sure to show your work in order to get

ENGR 313 Hydrology
Exam No. 3
December 1, 2011
Page 1 of 5
Name: _
Exam No. 3
(Open Book, open notes, 100 points possible)
Note: Points for each problem are shown. Evaluate and use your time accordingly! Be
sure to show your work in order to get partial c

ENGR 313 Hydrology
Exam No. 2
November 3, 2011
Page 1 of 4
Name: _
Exam No. 2 (Open Book Portion)
(Open Book, one 8.5x11 crib notes page, 100 points possible)
Note: Points for each problem are shown. Evaluate and use your time accordingly! Be
sure to show

ENGR 313 Hydrology
HEC-HMS Assignment - Tutorial
The purpose of this assignment is to gain an initial introduction to the HEC-HMS
(Hydrologic Modeling System) computer model. The assignment procedure and
submittals are presented briefly below.
Procedure:

ENGR 313 Hydrology
Fall Semester 2011
HEC-HMS Homework Problem 2
This assignment is a follow-up to the first HEC-HMS Homework Problem 1. This involves
placing a reservoir at the end of the reach you established in the first problem. All other data
remains

ENGR 313 Hydrology
Fall Semester 2011
HEC-HMS Homework Problem 1
This assignment is an exercise in inputting data and running the program HEC-HMS. The
problem is a basic rainfall-runoff model that estimates runoff from a basin and routes the runoff
along

MEMORANDUM
From:
Gary Fischer, P.E.
To:
ENGR 401 Hydraulics Class
Subject:
Programming Darcy-Weisbach/Colebrook Equations
The following equation (combination of Darcy-Weisbach and Colebrook equations with
minor losses) is probably the most complex of the

ENGR 401 Hydraulics
NOTES ON CRITICAL FLOW
Critical flow locates control points
Critical flow is the transition point between subcritical and supercritical flow
Critical flow usually occurs when subcritical flow is subjected to some kind of
release
Relati

ENGR 401 Hydraulics
Considerations for GVF Profiles
Governing Equation for GVF
dy S o S
=
dx 1 F 2
Examples:
M1 Profile
Mild slope
y > yn > yc; subcritical flow; F<1; (1 - F2) is +
velocity < velocity of uniform flow; S < So; (So S) is +
dy/dx is +; d

ENGR 313
Hydrology
Practice Problems for Unit Hydrographs
5. For the 3-hr UH shown, determine the DRO hydrograph for a 3-hr storm with net rain intensity
of 1.5 in/hr.
Time (hr)
3-hr DRO
ordinates with
i=1.5 in/hr
3-hr UH
ordinates
0
0
1
25
2
50
3
175
4
2

CARROLL MEMORANDUM
To:
Professor
From:
You
Date:
Whatever
Re:
Nature of the memo (porosity of materials, etc.)
You are expected to write a cover memo to your boss for each of the labs in this
course. The memo should include: (Please note the Roman numeral

Streamflow Measurement Using a Current Meter
ENGR 313 Hydrology
1. Divide the stream channel cross section into multiple sections, determining the location
that each velocity reading will be taken (distance d from the origin).
2. Need to determine flow ar

HELENA VALLEY FLOOD,
JUNE, 2011
WORST FLOOD IN THE HELENA
VALLEY SINCE 1981
EVENT MAGNITUDE
2011 FLOOD:
20 YEAR EVENT IN THE WEST VALLEY
30 YEAR EVENT IN THE EAST VALLEY
1981 FLOOD:
300 YEAR EVENT: WEST VALLEY
400 YEAR EVENT: EAST VALLEY
COMPARISON TO 198

The Penman Method for Estimating Evapotranspiration
ET = H + 0.27E
+ 0.27
= slope of the saturated vapor pressure curve of air at absolute
temperature (mm Hg/F), use Figure 6.8, page 169
H = the daily heat budget at the surface (mm/day), see equation 6.

Linear interpolation between two known points
(from Wikipedia)
If the two known points are given by the coordinates
and
, the linear
interpolant is the straight line between these points. For a value x in the interval
the value y along the straight line i