The structure and enclosed paved plaza of the BMW Zentrum building, located in Greenville, South Carolina, may be approximated as a 70-m diametercircle. Flow path length may be approximated as the average of the diameter and a half-circumference. The average surface slope ofthis combinedfacility is approximately 5 percent. (a) Compute time of concentration using the FAA equation. (b) Rainfall intensity for Greenville County may be computed by the formula i = a/ (b + t.)°, using coefficients in the following table. What is the expected 25-year rainfall intensity? (c) Using the rational method, whatis the expected peak 25-year runoff from this facility? (d) What factors may contribute to the uncertainty of this runoff estimate?
The structure and enclosed paved plaza of the BMW Zentrum building, located in Greenville, South Carolina, may be approximated as a 70-m diametercircle. Flow path length may be approximated as the average of the diameter and a half-circumference. The average surface slope ofthis combinedfacility is approximately 5 percent. (a) Compute time of concentration using the FAA equation. (b) Rainfall intensity for Greenville County may be computed by the formula i = a/ (b + t.)°, using coefficients in the following table. What is the expected 25-year rainfall intensity? (c) Using the rational method, whatis the expected peak 25-year runoff from this facility? (d) What factors may contribute to the uncertainty of this runoff estimate?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The structure and enclosed paved plaza of the BMW Zentrum building, located in Greenville, South
Carolina, may be approximated as a 70-m diametercircle. Flow path length may be approximated
as the average of the diameter and a half-circumference. The average surface slope ofthis
combinedfacility is approximately 5 percent.
(a) Compute time of concentration using the FAA equation.
(b) Rainfall intensity for Greenville County may be computed by the formula i = a/ (b + t.)°, using
coefficients in the following table. What is the expected 25-year rainfall intensity?
(c) Using the rational method, whatis the expected peak 25-year runoff from this facility?
(d) What factors may contribute to the uncertainty of this runoff estimate?
Transcribed Image Text:Frequency
(yr)
2
5
10
25
50
100
b
36.00240
C
1.03796
33.48168 1.02232
31.96134 1.01265
7044.042 29.95209 0.99969
7273.963 28.61085 0.99104
7492.464 27.30887 0.98274
a
6042.421
6445.667
6700.045
for to min and i = mm/hr
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Step 1: Introducing given data
VIEWStep 2: Calculate length of drainage path (L)
VIEWStep 3: Calculate time of concentration using the FAA equation.
VIEWStep 4: Calculate expected 25-year rainfall intensity
VIEWStep 5: Calculate expected peak 25-year runoff
VIEWStep 6: List factors affecting runoff
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