Compute the runoff from 5 inches of rainfall on a 1000-acre watershed. The hydrologic soil group is 50 percent Group B and 50 percent Group C interspersed throughout the watershed. Antecedent moisture condition II is assumed. The land use is given below followed by the reference table for Runoff CNs. 40 % residential area that is 30 % impervious12% residential area that is 65 % impervious18% paved roads with curbs and storm sewers16 % open land with 50 % fair grass cover and 50 % good grass cover14 % parking lots, plazas, schools, etc. (all impervious)Runoff Curve Numbers for Selected Agricultural, Suburban, and Urban Land Use (Antecedent MoistureCondition II; la=0.25)Hydrologic SoilGroupLand Use DescriptionА в с DOpen spaces, lawns, parks, golf courses, cemeteries, etc.Good condition: grass cover on 75% or more of the areaFair condition: grass cover on 50%-75% of the areaCommercial and business areas (85% impervious)Industrial districts (72% impervious)Residential339617480496979848992949581889193Average lot size1/8 ac or less1/4 ac1/3 ac1/2 ac1 acPaved parking lots, roofs, driveways, etc.Streets and roadsPaved with curbs and storm sewersAverage % impervious4857761659092387583873057728186255470808520516879849898989898989898Gravel76858991Dirt72828789

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Answered: Compute the runoff from 5 inches of…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Compute the runoff from 5 inches of rainfall on a 1000-acre watershed. The hydrologic soil group is 50 percent Group B and 50 percent Group C interspersed throughout the watershed. Antecedent moisture condition II is assumed. The land use is given below followed by the reference table for Runoff CNs.

40 % residential area that is 30 % impervious
12% residential area that is 65 % impervious
18% paved roads with curbs and storm sewers
16 % open land with 50 % fair grass cover and 50 % good grass cover
14 % parking lots, plazas, schools, etc. (all impervious)
Runoff Curve Numbers for Selected Agricultural, Suburban, and Urban Land Use (Antecedent Moisture
Condition II; la=0.25)
Hydrologic Soil
Group
Land Use Description
А в с D
Open spaces, lawns, parks, golf courses, cemeteries, etc.
Good condition: grass cover on 75% or more of the area
Fair condition: grass cover on 50%-75% of the area
Commercial and business areas (85% impervious)
Industrial districts (72% impervious)
Residential3
39
61
74
80
49
69
79
84
89
92
94
95
81
88
91
93
Average lot size
1/8 ac or less
1/4 ac
1/3 ac
1/2 ac
1 ac
Paved parking lots, roofs, driveways, etc.
Streets and roads
Paved with curbs and storm sewers
Average % impervious4
85
77
61
65
90
92
38
75
83
87
30
57
72
81
86
25
54
70
80
85
20
51
68
79
84
98
98
98
98
98
98
98
98
Gravel
76
85
89
91
Dirt
72
82
87
89

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