7-MM Ditch Q's

Runoff Calculations for Ditch MM D-1 Slope 0.129
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
0.9
0
Totals 1.205 0.2835
C = 0.2835 (coef) / 1.205 (acres) = 0.2352697
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 cf
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 Ditch MM D-2 Slope 0.038
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 (gravel)
0.04
0.7
0.028
Roofs
0
0.9
0
Totals 0.31 0.082
C = 0.082 (coef) / 0.31 (acres) = 0.2645161
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.264516 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) = 0.264516 X 5.21 X 0.31 = 0.42722
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.264516 X 8.09 X 0.31 = 0.66338 cfs

Runoff Calculations for Ditch MM D-3 Slope 0.125
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil(sloping)
0.59
0.5
0.295
Grassland
0
0.35
0
Woodlands
1.4
0.2
0.28
Roadway (gravel)
0.088
0.7
0.0616
Roofs
0
0.9
0
C = 0.6366 (coef) / 2.078 (acres) = 0.3063523
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.306352 X 7.06 X 2.078 = 4.494396 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.306352 X 5.21 X 2.078 = 3.316686
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.306352 X 8.09 X 2.078 = 5.150094 cfs

Runoff Calculations for Ditch MM D-4 Slope 0.03
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil(sloping)
0.62
0.5
0.31
Grassland
0.35
0
Woodlands
1.26
0.2
0.252
Roadway (gravel)
0.088
0.7
0.0616
Roofs
0
0.9
0
C = 0.6236 (coef) / 1.968 (acres) = 0.3168699
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.31687 X 7.06 X 1.968 = 4.402616 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.31687 X 5.21 X 1.968 = 3.248956
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.31687 X 8.09 X 1.968 = 5.044924 cfs

Runoff Calculations for Ditch MM D-5 Slope 0.02
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0.31
0.45
0.1395
Bare Soil(sloping)
0
0.5
0
Grassland
0
0.35
0
Woodlands
0
0.2
0
Roadway (gravel)
0
0.7
0
Roofs
0
0.9
0
Totals 0.31 0.1395
C = 0.1395 (coef) / 0.31 (acres) = 0.45
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.45 X 7.06 X 0.31 = 0.98487 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.45 X 5.21 X 0.31 = 0.726795
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.45 X 8.09 X 0.31 = 1.128555 cfs

Runoff Calculations for Ditch MM D-6 Slope 0.18
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
0.9
0
C = 0.0828 (coef) / 0.304 (acres) = 0.2723684
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.272368 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) = 0.272368 X 5.21 X 0.304 = 0.431388
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.272368 X 8.09 X 0.304 = 0.669852 cfs

Runoff Calculations for Ditch MM D-7 Slope 0.1
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
0.31
0.2
0.062
Roadway (gravel)
0.069
0.7
0.0483
Roofs
0
0.9
0
Totals 0.379 0.1103
C = 0.1103 (coef) / 0.379 (acres) = 0.291029
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.291029 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) = 0.291029 X 5.21 X 0.379 = 0.574663
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.291029 X 8.09 X 0.379 = 0.892327 cfs

Runoff Calculations for Ditch MM D-8 Slope 0.14
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
0.38
0.2
0.076
Roadway (gravel)
0.04
0.7
0.028
Roofs
0
0.9
0
Totals 0.42 0.104
C = 0.104 (coef) / 0.42 (acres) = 0.247619
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.247619 X 7.06 X 0.42 = 0.73424 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.247619 X 5.21 X 0.42 = 0.54184
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.247619 X 8.09 X 0.42 = 0.84136 cfs

Runoff Calculations for Ditch MM D-8A Slope 0.13
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
0.9
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
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 Ditch MM D-9 Slope 0.126
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
0.9
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
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 Ditch MM D-10 Slope 0.126
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
0.24
0.2
0.048
Roadway (gravel)
0.039
0.7
0.0273
Roofs
0
0.9
0
Totals 0.279 0.0753
C = 0.0753 (coef) / 0.279 (acres) = 0.2698925
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.269892 X 7.06 X 0.279 = 0.531618 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.269892 X 5.21 X 0.279 = 0.392313
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.269892 X 8.09 X 0.279 = 0.609177 cfs

Runoff Calculations for Ditch MM D-11 Slope 0.02
Description
Acres C-Value Coef.
Bare Sandy Soil (level)
0
0.45
0
Bare Soil(sloping)
0.02
0.5
0.01
Grassland
0
0.35
0
Woodlands
1.09
0.2
0.218
Roadway (gravel)
0.033
0.7
0.0231
Roofs
0
0.9
0
Totals 1.143 0.2511
C = 0.2511 (coef) / 1.143 (acres) = 0.219685
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.219685 X 7.06 X 1.143 = 1.772766 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.219685 X 5.21 X 1.143 = 1.308231 cf
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.219685 X 8.09 X 1.143 = 2.031399 cfs

Runoff Calculations for Ditch MM D-12 Slope 0.03
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 (gravel)
0
0.7
0
Roofs
0
0.9
0
Totals 0.426 0.1572
C = 0.1572 (coef) / 0.426 (acres) = 0.3690141
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.369014 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) = 0.369014 X 5.21 X 0.426 = 0.819012
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.369014 X 8.09 X 0.426 = 1.271748 cfs

Runoff Calculations for Ditch MM D-13 Slope 0.115
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
0.9
0
Totals 0.372 0.1104
C = 0.1104 (coef) / 0.372 (acres) = 0.2967742
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.296774 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) = 0.296774 X 5.21 X 0.372 = 0.575184
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.296774 X 8.09 X 0.372 = 0.893136 cfs

Runoff Calculations for Ditch MM D13A Slope 0.06
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
0.14
0.2
0.028
Roadway (gravel)
0.024
0.7
0.0168
Roofs
0
0.9
0
C = 0.0448 (coef) / 0.164 (acres) = 0.2731707
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.273171 X 7.06 X 0.164 = 0.316288 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.273171 X 5.21 X 0.164 = 0.233408
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.273171 X 8.09 X 0.164 = 0.362432 cfs

Runoff Calculations for Ditch MM D-14 Slope 0.04
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
0.11
0.2
0.022
Roadway (gravel)
0.039
0.7
0.0273
Roofs
0
0.9
0
���1��1 � • Ia1I�!�Cj
C = 0.0493 (coef) / 0.149 (acres) = 0.3308725
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.330872 X 7.06 X 0.149 = 0.348058 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.330872 X 5.21 X 0.149 = 0.256853
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.330872 X 8.09 X 0.149 = 0.398837 cfs

Runoff Calculations for Ditch MM D-14A Slope 0.05
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
0.14
0.2
0.028
Roadway (gravel)
0.034
0.7
0.0238
Roofs
0
0.9
0
Totals 0.174 0.0518
C = 0.0518 (coef) / 0.174 (acres) = 0.2977011
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.297701 X 7.06 X 0.174 = 0.365708 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.297701 X 5.21 X 0.174 = 0.269878
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.297701 X 8.09 X 0.174 = 0.419062 cfs

Runoff Calculations for Ditch MM D-15 Slope 0.096
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
0.9
0
Totals 0.36 0.1145
C = 0.1145 (coef) / 0.36 (acres) = 0.3180556
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.318056 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) = 0.318056 X 5.21 X 0.36 = 0.596545
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.318056 X 8.09 X 0.36 = 0.926305 cfs

Runoff Calculations for Ditch MM D-16 Slope 0.168
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 (gravel)
0.05
0.7
0.035
Roofs
0
0.9
0
Totals 0.17 0.059
C = 0.059 (coef) / 0.17 (acres) = 0.3470588
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.347059 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) = 0.347059 X 5.21 X 0.17 = 0.30739
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.347059 X 8.09 X 0.17 = 0.47731 cfs