Rational methodAnswer 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? Rainfall intensity (in./hr)20.015.010.08.06.04.02.01.00.80.60.40.20.10.080.060.040.02510Houston, Texas, 1910-1951Note:Frequency analysis bymethod of extreme values,after Gumbel (1958)Period return (yr)10015 20 30 40 60(min)2Duration3 4 5 6 8 10 12 18 24(hr)Description of AreaBusinessDowntown areasNeighborhood areasResidentialSingle-family areasMulti-units, detachedMulti-units, attachedResidential (suburban)Apartment dwelling areasIndustrialLight areasHeavy areasParks, cemeteriesPlaygroundsRailroad yard areasUnimproved areasStreetsAsphaltConcreteBrickDrives and walksRoofsLawns, sandy soilFlat, 2%Average, 2%-7%Steep, 7%Lawns, heavy soilFlat, 2%Average, 2%-7%Steep, 7%Runoff Coefficients0.70-0.950.50-0.700.30-0.500.40-0.600.60-0.750.25-0.400.50-0.700.50-0.800.60-0.900.10-0.250.20-0.350.20-0.400.10-0.300.70-0.950.80-0.950.70-0.850.75-0.850.75-0.950.05-0.100.10-0.150.15-0.200.13-0.170.18-0.220.25-0.35These runoff coefficients are typical values for return periods of2-10 yr. Higher values are appropriate for higher return periods.Source: ASCE and WPCF (1969).

Answered: Image /qna-images/answer/7a44561c-b5a1-44fc-a168-20cf7fbb8758.jpg

Answered: storm that recorded 2.0 inches/hour for…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Concept explainers

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?

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).

Expert Solution

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions