storm that recorded 2.0 inches/hour for 2 hours in Houston? (b) What amount of rain (in inches) would have to fall in a 6-hour period to be considered a 10-year storm in Houston? (c) What is the return period of a storm that lasts 2 hours and records 3.5 inches of rainfall?
storm that recorded 2.0 inches/hour for 2 hours in Houston? (b) What amount of rain (in inches) would have to fall in a 6-hour period to be considered a 10-year storm in Houston? (c) What is the return period of a storm that lasts 2 hours and records 3.5 inches of rainfall?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Rational method
Answer the following questions referring to the Intensity-Duration-Frequency curves and runoff
coefficient data below:
(a) What is the return period of a storm that recorded 2.0 inches/hour for 2 hours in Houston?
(b) What amount of rain (in inches) would have to fall in a 6-hour period to be considered a 10-year
storm in Houston?
(c) What is the return period of a storm that lasts 2 hours and records 3.5 inches of rainfall?
Transcribed Image Text:Rainfall intensity (in./hr)
20.0
15.0
10.0
8.0
6.0
4.0
2.0
1.0
0.8
0.6
0.4
0.2
0.1
0.08
0.06
0.04
0.02
5
10
Houston, Texas, 1910-1951
Note:
Frequency analysis by
method of extreme values,
after Gumbel (1958)
Period return (yr)
100
15 20 30 40 60
(min)
2
Duration
3 4 5 6 8 10 12 18 24
(hr)
Description of Area
Business
Downtown areas
Neighborhood areas
Residential
Single-family areas
Multi-units, detached
Multi-units, attached
Residential (suburban)
Apartment dwelling areas
Industrial
Light areas
Heavy areas
Parks, cemeteries
Playgrounds
Railroad yard areas
Unimproved areas
Streets
Asphalt
Concrete
Brick
Drives and walks
Roofs
Lawns, sandy soil
Flat, 2%
Average, 2%-7%
Steep, 7%
Lawns, heavy soil
Flat, 2%
Average, 2%-7%
Steep, 7%
Runoff Coefficients
0.70-0.95
0.50-0.70
0.30-0.50
0.40-0.60
0.60-0.75
0.25-0.40
0.50-0.70
0.50-0.80
0.60-0.90
0.10-0.25
0.20-0.35
0.20-0.40
0.10-0.30
0.70-0.95
0.80-0.95
0.70-0.85
0.75-0.85
0.75-0.95
0.05-0.10
0.10-0.15
0.15-0.20
0.13-0.17
0.18-0.22
0.25-0.35
These runoff coefficients are typical values for return periods of
2-10 yr. Higher values are appropriate for higher return periods.
Source: ASCE and WPCF (1969).
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