9-MM Skimmer Basin Q's

Runoff Calculations for Skimmer Basin MM SB-1
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
1.12
0.2
0.224
Roadway (gravel)
0.085
0.7
0.0595
Roofs
0
0.45
0
Totals 1.205 0.2835
C = 0.2835 (coef) / 1.205 (acres) = 0.23526971
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.23527 X 7.06 X 1.205 = 2.00151 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.23527 X 5.21 X 1.205 = 1.477035 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.23527 X 8.09 X 1.205 = 2.293515 cfs

Runoff Calculations for Skimmer Basin MM SB-2
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.27
0.2
0.054
,Roadway ravel
0.04
0.7
0.028
Roofs
0
0.45
0
Totals 0.31 0.082
C = 0.082 (coef) / 0.31 (acres) = 0.26451613
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.26452 X 7.06 X 0.31 = 0.57892 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.26452 X 5.21 X 0.31 = 0.42722 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.26452 X 8.09 X 0.31 = 0.66338 cfs

Runoff Calculations for Skimmer Basin MM SB-3
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0.31
0.45
0.1395
Bare Soil (sloping)
0.62
0.5
0.31
Grassland
0
0.35
0
Woodlands
1.26
0.2
0.252
Roadway (gravel)
0.085
0.7
1 0.0595
Roofs
0
0.45
0
Totals 2.215 0.161
C = 0.761 (coef) / 2.275 (acres) = 0.33450549
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.33451 X 7.06 X 2.275 = 5.37266 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.33451 X 5.21 X 2.275 = 3.96481 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.33451 X 8.09 X 2.275 = 6.15649 cfs

Runoff Calculations for Skimmer Basin MM SB-3A
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.26
0.2
0.052
Roadway (gravel)
0.044
0.7
0.0308
Roofs
0
0.45
0
Totals 0.304 0.0828
C = 0.0828 (coef) / 0.304 (acres) = 0.27236842
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.27237 X 7.06 X 0.304 = 0.584568 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.27237 X 5.21 X 0.304 = 0.431388 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.27237 X 8.09 X 0.304 = 0.669852 cfs

Runoff Calculations for Skimmer Basin MM SB4
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.31
0.2
0.062
,Roadway ravel
0.069
0.7
0.0483
Roofs
0
0.45
0
Totals 0.319 0.1103
C = 0.1103 (coef) / 0.379 (acres) = 0.29102902
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.29103 X 7.06 X 0.379 = 0.778718 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.29103 X 5.21 X 0.379 = 0.574663 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.29103 X 8.09 X 0.379 = 0.892327 cfs

Runoff Calculations for Skimmer Basin MM SB-5
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.3
0.2
0.06
Roadway (gravel)
0.072
0.7
0.0504
Roofs
0
0.45
0
Totals 0.312 0.1104
C = 0.1104 (coef) / 0.372 (acres) = 0.29677419
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.29677 X 7.06 X 0.372 = 0.779424 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.29677 X 5.21 X 0.372 = 0.575184 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.29677 X 8.09 X 0.372 = 0.893136 cfs

Runoff Calculations for Skimmer Basin MM SB-6
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.52
0.2
0.104
Roadway (gravel)
0.028
0.7
0.0196
Roofs
0
0.45
0
Totals 0.548 0.1236
C = 0.1236 (coef) / 0.548 (acres) = 0.22554745
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.22555 X 7.06 X 0.548 = 0.872616 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.22555 X 5.21 X 0.548 = 0.643956 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.22555 X 8.09 X 0.548 = 0.999924 cfs

Runoff Calculations for Skimmer Basin MM SB-7
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0.07
0.5
0.035
Grassland
0
0.35
0
Woodlands
0.125
0.2
0.025
Roadway (gravel)
0.03
0.7
0.021
Roofs
0
0.45
0
Totals 0.225 0.081
C = 0.081 (coef) / 0.225 (acres) = 0.36
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.36 X 7.06 X 0.225 = 0.57186 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.36 X 5.21 X 0.225 = 0.42201 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.36 X 8.09 X 0.225 = 0.65529 cfs

Runoff Calculations for Skimmer Basin MM SB-8
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.54
0.2
0.108
Roadway (gravel)
0.078
0.7
0.0546
Roofs
0
0.45
0
Totals 0.618 0.1626
C = 0.1626 (coef) / 0.618 (acres) = 0.2631068
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.26311 X 7.06 X 0.618 = 1.147956 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.26311 X 5.21 X 0.618 = 0.847146 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.26311 X 8.09 X 0.618 = 1.315434 cfs

Runoff Calculations for Skimmer Basin MM SB-9
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0.03
0.5
0.015
Grassland
0
0.35
0
Woodlands
0.54
0.2
0.108
,Roadway ravel
0
0.7
0
Roofs
0
0.45
0
Totals 0.51 0.123
C = 0.123 (coef) / 0.57 (acres) = 0.21578947
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.21579 X 7.06 X 0.57 = 0.86838 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.21579 X 5.21 X 0.57 = 0.64083 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.21579 X 8.09 X 0.57 = 0.99507 cfs

Runoff Calculations for Skimmer Basin MM SB-10
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0.036
0.45
0.0162
Bare Soil (sloping)
0.21
0.5
0.105
Grassland
0
0.35
0
Woodlands
0.18
0.2
0.036
,Roadway ravel
0
0.7
0
Roofs
0
0.45
0
Totals 0.426 0.1512
C = 0.1572 (coef) / 0.426 (acres) = 0.36901408
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.36901 X 7.06 X 0.426 = 1.109832 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.36901 X 5.21 X 0.426 = 0.819012 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.36901 X 8.09 X 0.426 = 1.271748 cfs

Runoff Calculations for Skimmer Basin MM SB-11
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.25
0.2
0.05
,Roadway ravel
0.073
0.7
0.0511
Roofs
0
0.45
0
Totals 0.323 0.1011
C = 0. 10 11 (coef) / 0.323 (acres) = 0.3130031
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.313 X 7.06 X 0.323 = 0.713766 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.313 X 5.21 X 0.323 = 0.526731 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.313 X 8.09 X 0.323 = 0.817899 cfs

Runoff Calculations for Skimmer Basin MM SB-12
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.275
0.2
0.055
Roadway (gravel)
0.085
0.7
0.0595
Roofs
0
0.45
0
Totals 0.36 0.1145
C = 0.1145 (coef) / 0.36 (acres) = 0.31805556
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.31806 X 7.06 X 0.36 = 0.80837 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.31806 X 5.21 X 0.36 = 0.596545 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.31806 X 8.09 X 0.36 = 0.926305 cfs

Runoff Calculations for Skimmer Basin MM SB13
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil (sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0.12
0.2
0.024
,Roadway ravel
0.05
0.7
0.035
Roofs
0
0.45
0
Totals 0.11 0.059
C = 0.059 (coef) / 0.17 (acres) = 0.34705882
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.34706 X 7.06 X 0.17 = 0.41654 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.34706 X 5.21 X 0.17 = 0.30739 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.34706 X 8.09 X 0.17 = 0.47731 cfs