CEIE 340 -- Water Resources Engineering

Lab Assignment 2

Problem 1

From the Intensity-Duration-Frequency curve shown in Figure 4.4, page 187, of the text, determine the missing values of intensity, depth, duration, or frequency of the following table.  For each missing value that you supply, write a short explanation (one or two sentences) explaining how you determined the value.

Intensity [in/hr]	Depth [in]	Duration [hr]	Frequency [yr]
2.0	4.00
	4.80	24.0
		6.0	75
	0.58	0.083
0.3		12.0

This is problem 4.11 on page 224 of the text.

Problem 2

Find the average rainfall depth using the station-average, Thiessen, and isohyetal methods for this watershed.  Rainfall data from the rain gages are given below:

Gage	Catch (in)
A	2.7
B	2.3
C	1.9
D	1.7

Write a short report explaining what you did and what average rainfall depth you would recommend using for this watershed.  The report should be no more than one page, double-spaced, font size 12, and margins of one inch on all sides.

This is problem 4.55 on page 233 of the text.

Problem 3

Use the procedure in Section 4.6.2 of the text to develop a 100-year, 24-hour design storm for Baltimore, using a 3-hour increment.  Use Figure 4.4 for IDF data.  Also place the design storm in dimensionless form.

Provide details of your calculations to produce the design storm and its dimensionless form.  Also provide graphs analogous to Figure 4.16.

This is problem 4.64 on page 234 of the text.