An agricultural watershed that is managed to minimize runoff consists of 100 acres that has a gentle land slope (1-2%) and silty/sandy soils. Estimate the peak runoff flow rate for a storm with rainfall intensity of 0.5 in/h. This same land is planned to be developed into a residential subdivision: 60% as a low-density residential area and 40% as a medium-density residential area. Estimate the peak flow rate for a storm with rainfall intensity of 0.5 in/hr. What is the percent change? Table/7.2 Typical Runoff Coefficients and Percent Impervious Area Values for Various Land Uses Runoff coefficients are given for two land slope categories for three types of soils. Land Use Industrial Commercial High-density residential (15 homes/acre) Medium-density residential (5 homes/acre) Low-density residential (2 homes/acre) Agricultural Open space (parks, grass, pasture) Percent Nonpermeable Area 90 95 60 30 15 5 2 Runoff Coefficient for Sandy Soils Land Slope (%) 0-2 0.67 0.71 0.47 0.25 0.14 0.08 0.05 2-6 0.68 0.71 0.49 0.28 0.19 0.13 0.10 Runoff Coefficient for Sandy/Silty Soils Land Slope (%) 2-6 0.68 0.72 0.50 0-2 0.68 0.71 0.48 0.27 0.17 0.11 0.08 0.30 0.21 0.15 0.13 Runoff Coefficient for Clayey Soils Land Slope (%) 2-6 0-2 0.69 0.72 0.51 0.33 0.24 0.18 0.16 0.69 0.72 0.53 0.36 0.28 0.23 0.21
An agricultural watershed that is managed to minimize runoff consists of 100 acres that has a gentle land slope (1-2%) and silty/sandy soils. Estimate the peak runoff flow rate for a storm with rainfall intensity of 0.5 in/h. This same land is planned to be developed into a residential subdivision: 60% as a low-density residential area and 40% as a medium-density residential area. Estimate the peak flow rate for a storm with rainfall intensity of 0.5 in/hr. What is the percent change? Table/7.2 Typical Runoff Coefficients and Percent Impervious Area Values for Various Land Uses Runoff coefficients are given for two land slope categories for three types of soils. Land Use Industrial Commercial High-density residential (15 homes/acre) Medium-density residential (5 homes/acre) Low-density residential (2 homes/acre) Agricultural Open space (parks, grass, pasture) Percent Nonpermeable Area 90 95 60 30 15 5 2 Runoff Coefficient for Sandy Soils Land Slope (%) 0-2 0.67 0.71 0.47 0.25 0.14 0.08 0.05 2-6 0.68 0.71 0.49 0.28 0.19 0.13 0.10 Runoff Coefficient for Sandy/Silty Soils Land Slope (%) 2-6 0.68 0.72 0.50 0-2 0.68 0.71 0.48 0.27 0.17 0.11 0.08 0.30 0.21 0.15 0.13 Runoff Coefficient for Clayey Soils Land Slope (%) 2-6 0-2 0.69 0.72 0.51 0.33 0.24 0.18 0.16 0.69 0.72 0.53 0.36 0.28 0.23 0.21
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:An agricultural watershed that is managed to
minimize runoff consists of 100 acres that has a
gentle land slope (1-2%) and silty/sandy soils.
Estimate the peak runoff flow rate for a storm
with rainfall intensity of 0.5 in/h. This same land
is planned to be developed into a residential
subdivision: 60% as a low-density residential
area and 40%
as a medium-density residential area. Estimate
the peak flow rate for a storm with rainfall
intensity of 0.5 in/hr. What is the percent
change?
Table/7.2
Typical Runoff Coefficients and Percent Impervious Area Values for Various Land Uses Runoff coefficients
are given for two land slope categories for three types of soils.
Land Use
Industrial
Commercial
High-density residential
(15 homes/acre)
Medium-density
residential (5 homes/acre)
Low-density residential
(2 homes/acre)
Percent
Nonpermeable
Area
90
95
60
30
15
Agricultural
Open space (parks, grass,
pasture)
SOURCE: Wisconsin Department of Transportation (2012).
5
2
Runoff Coefficient for
Sandy Soils
Land Slope (%)
0-2
0.67
0.71
0.47
0.25
0.14
0.08
0.05
2-6
0.68
0.71
0.49
0.28
0.19
0.13
0.10
Runoff Coefficient for
Sandy/Silty Soils
Land Slope (%)
2-6
0.68
0.72
0.50
0-2
0.68
0.71
0.48
0.27
0.17
0.11
0.08
0.30
0.21
0.15
0.13
Runoff Coefficient for
Clayey Soils
Land Slope (%)
2-6
0-2
0.69
0.72
0.51
0.33
0.24
0.18
0.16
0.69
0.72
0.53
0.36
0.28
0.23
0.21
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