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RATIONAL METHOD WORKSHEET Project:
Date: Shytle
17/201
7
Designer: AGF
Watershed ID: LS#1/Swalel
Drainage Area: 0.94 Acres
c-factor: 0.48 (see worksheet)
tc: 5.00 mins. (see worksheet)
Q(2): 2.32 cfs
Q(10): 3.03 cfs
Time of Concentration Worksheet Weighted c-factor Worksheet
Overland Flow Time Cover Type Area c areaxcn
Source: Seelye Chart as modified in VDOT Drainage Manual(Fig.1.5.1.1 Impervious 0.07 0.90 0.06
on Page 1-13E) Lawn 0.87 0.45 0.39
Notes:
0.00
1)Length of overland flow always<=200 ft 0.00
2)Calculate a separate Tc for each ground cover condition along the flow path 0.00
c-factor= 0.48
35.00 Enter Length of Strip(ft) Sample"C"values:
2.00 Enter Slope(%or fU100ft) 0.22 Dense grass
0.90 Enter Rational Method"C"value 0.28 Average grass
0.36 Poor grass
2.34 Result Tc(minutes) 0.48 Bare soil
0.90 Pavement
Shallow Concentrated Flow Time Pipe Flow Time 1
Source: SCS Velocity Graph as published in Virginia Erosion and Assumes 5 ft/s velocity in pipe
Sediment Control Handbook,Third Edition(Plate 5-2 on Page V-12) 0.00 Enter Length of Flow in Pipe(ft)(estimated)
Notes:
1)Not intended for well-defined channels-see channel flow calculation 0.00 Result Tc(minutes)
2)Calculate a separate Tc for each ground cover condition along the flow path
350.00 Enter Length of Flow(ft)
2.00 Enter Slope(%or fU100ft)
2.57 Result Tc(minutes)IF UNPAVED
Result Tc(minutes)IF PAVED
Pipe Flow Time 2 Pipe Flow Time 3
Assumes 5 ft/s velocity in pipe Assumes 5 fUs velocity in pipe
0.00 Enter Length of Flow in Pipe(ft) 0.00 Enter Length of Flow in Pipe(ft)
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 1 Channel Flow Time 2
Source: Kirpich Chart as modified in VDOT Drainage Manual Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes: Notes:
1)For small drainage basins. 1)For small drainage basins.
2)For concrete channels,use 0.2*Tc 2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft) 0.00 Enter Length of Flow(ft)
30.00 Enter Height of most remote point along flow path above outlet 10.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 3
Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes:
1)For small drainage basins.
2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft)
1.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes)
RATIONAL METHOD WORKSHEET Project: Shytle
METHDate: 7/17/2017
Designer: AGF
Watershed ID: LS#2/DitchL2
Drainage Area: 0.16 Acres
c-factor: 0.65 (see worksheet)
tc: 5.00 mins. (see worksheet)
Q(2): 0.53 cfs
Q(10): 0.69 cfs
Time of Concentration Worksheet Weighted c-factor Worksheet
Overland Flow Time Cover Type Area c areaxcn
Source: Seelye Chart as modified in VDOT Drainage Manual(Fig.1.5.1.1 Impervious 0.07 0.90 0.06
on Page 1-13E) Managed Turf 0.09 0.45 0.04
Notes: 0.00
1)Length of overland flow always<=200 ft 0.00
2)Calculate a separate Tc for each ground cover condition along the flow path 0.00
c-factor= 0.65
35.00 Enter Length of Strip(ft) Sample"C"values:
2.00 Enter Slope(%or ft/100ft) 0.22 Dense grass
0.90 Enter Rational Method"C"value 0.28 Average grass
0.36 Poor grass
2.34 Result Tc(minutes) 0.48 Bare soil
0.90 Pavement
Shallow Concentrated Flow Time Pipe Flow Time 1
Source: SCS Velocity Graph as published in Virginia Erosion and Assumes 5 ft/s velocity in pipe
Sediment Control Handbook,Third Edition(Plate 5-2 on Page V-12) 0.00 Enter Length of Flow in Pipe(ft)(estimated)
Notes:
1)Not intended for well-defined channels-see channel flow calculation 0.00 Result Tc(minutes)
2)Calculate a separate Tc for each ground cover condition along the flow path
350.00 Enter Length of Flow(ft)
2.00 Enter Slope(%or ft/100ft)
2.57 Result Tc(minutes)IF UNPAVED
Result Tc(minutes)IF PAVED
Pipe Flow Time 2 Pipe Flow Time 3
Assumes 5 ft/s velocity in pipe Assumes 5 ft/s velocity in pipe
0.00 Enter Length of Flow in Pipe(ft) 0.00 Enter Length of Flow in Pipe(ft)
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 1 Channel Flow Time 2
Source: Kirpich Chart as modified in VDOT Drainage Manual Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes: Notes:
1)For small drainage basins. 1)For small drainage basins.
2)For concrete channels,use 0.2`Tc 2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft) 0.00 Enter Length of Flow(ft)
30.00 Enter Height of most remote point along flow path above outlet 10.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 3
Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes:
1)For small drainage basins.
2)For concrete channels.use 0.2*Tc
0.00 Enter Length of Flow(ft)
1.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes)
RATIONAL METHOD VOTKSFIET Project:
Date: Shytle
17/201
7
Designer: AGF
Watershed ID: LS#3/DitchR2
Drainage Area: 0.90 Acres
c-factor: 0.49 (see worksheet)
tc: 5.00 mins. (see worksheet)
Q(2): 2.23 cfs
Q(10): 2.91 cfs
Time of Concentration Worksheet Weighted c-factor Worksheet
Overland Flow Time Cover Type Area c areaxcn
Source: Seelye Chart as modified in VDOT Drainage Manual(Fig. 1.5.1.1 Impervious 0.07 0.90 0.06
on Page 1-13E) Managed Turf 0.83 0.45 0.37
Notes: 0.00
1)Length of overland flow always<=200 ft 0.00
2)Calculate a separate Tc for each ground cover condition along the flow path 0.00
c-factor= 0.49
35.00 Enter Length of Strip(ft) Sample"C"values:
2.00 Enter Slope(%or ft/100ft) 0.22 Dense grass
0.90 Enter Rational Method"C"value 0.28 Average grass
0.36 Poor grass
2.34 Result Tc(minutes) 0.48 Bare soil
0.90 Pavement
Shallow Concentrated Flow Time Pipe Flow Time 1
Source: SCS Velocity Graph as published in Virginia Erosion and Assumes 5 ft/s velocity in pipe
Sediment Control Handbook,Third Edition(Plate 5-2 on Page V-12) 0.00 Enter Length of Flow in Pipe(ft)(estimated)
Notes:
1)Not intended for well-defined channels-see channel flow calculation 0.00 Result Tc(minutes)
2)Calculate a separate Tc for each ground cover condition along the flow path
350.00 Enter Length of Flow(ft)
2.00 Enter Slope(%or ft/100ft)
2.57 Result Tc(minutes)IF UNPAVED
Result Tc(minutes)IF PAVED
Pipe Flow Time 2 Pipe Flow Time 3
Assumes 5 ft/s velocity in pipe Assumes 5 ft/s velocity in pipe
0.00 Enter Length of Flow in Pipe(ft) 0.00 Enter Length of Flow in Pipe(ft)
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 1 Channel Flow Time 2
Source: Kirpich Chart as modified in VDOT Drainage Manual Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes: Notes.
1)For small drainage basins. 1)For small drainage basins.
2)For concrete channels,use 0.2*Tc 2)For concrete channels,use 0.2`Tc
0.00 Enter Length of Flow(ft) 0.00 Enter Length of Flow(ft)
30.00 Enter Height of most remote point along flow path above outlet 10.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 3
Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes:
1)For small drainage basins.
2)For concrete channels,use 0.2'Tc
0.00 Enter Length of Flow(ft)
1.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes)
RATIONAL METHOD WORKSHEET Project: Shytle
Date: 7/17/2017
Designer: AGE
Watershed ID: LS#4
Drainage Area: 0.36 Acres
c-factor: 0.58 (see worksheet)
tc: 5.00 mins. (see worksheet)
Q(2): 1.06 cfs
Q(10): 1.38 cfs
Time of Concentration Worksheet Weighted c-factor Worksheet
Overland Flow Time Cover Type Area c areaxcn
Source: Seelye Chart as modified in VDOT Drainage Manual(Fig.1.5.1.1 Impervious 0.10 0.90 0.09
on Page 1-13E) Managed Turf 0.26 0.45 0.12
Notes: 0.00
1)Length of overland flow always<=200 ft 0.00
2)Calculate a separate Tc for each ground cover condition along the flow path 0.00
c-factor= 0.58
35.00 Enter Length of Strip(ft) Sample"C"values:
2.00 Enter Slope(%or ft/100ft) 0.22 Dense grass
0.90 Enter Rational Method"C"value 0.28 Average grass
0.36 Poor grass
2.34 Result Tc(minutes) 0.48 Bare soil
0.90 Pavement
Shallow Concentrated Flow Time Pipe Flow Time 1
Source: SCS Velocity Graph as published in Virginia Erosion and Assumes 5 ft/s velocity in pipe
Sediment Control Handbook,Third Edition(Plate 5-2 on Page V-12) 0.00 Enter Length of Flow in Pipe(ft)(estimated)
Notes:
1)Not intended for well-defined channels-see channel flow calculation 0.00 Result Tc(minutes)
2)Calculate a separate Tc for each ground cover condition along the flow path
350.00 Enter Length of Flow(ft)
2.00 Enter Slope(%or ft/100ft)
2.57 Result Tc(minutes)IF UNPAVED
Result Tc(minutes)IF PAVED
Pipe Flow Time 2 Pipe Flow Time 3
Assumes 5 ft/s velocity in pipe Assumes 5 ft/s velocity in pipe
0.00 Enter Length of Flow in Pipe(ft) 0.00 Enter Length of Flow in Pipe(ft)
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 1 Channel Flow Time 2
Source: Kirpich Chart as modified in VDOT Drainage Manual Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes: Notes:
1)For small drainage basins. 1)For small drainage basins.
2)For concrete channels,use 0.2*Tc 2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft) 0.00 Enter Length of Flow(ft)
30.00 Enter Height of most remote point along flow path above outlet 10.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 3
Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes:
1)For small drainage basins.
2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft)
1.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes)
RATIONAL METHOD WORKSHEET Project:
Date: Shytle
17/201
7
Designer: AGE
Watershed ID: DitchLl
Drainage Area: 0.12 Acres
c-factor: 0.68 (see worksheet)
tc: 5.00 mins. (see worksheet)
Q(2): 0.41 cfs
Q(10): 0.54 cfs
Time of Concentration Worksheet Weighted c-factor Worksheet
Overland Flow Time Cover Type Area c areaxcn
Source: Seelye Chart as modified in VDOT Drainage Manual(Fig.1.5.1.1 Impervious 0.06 0.90 0.05
on Page 1-13E) Managed Turf 0.06 0.45 0.03
Notes: 0.00
1)Length of overland flow always<=200 ft 0.00
2)Calculate a separate Tc for each ground cover condition along the flow path 0.00
c-factor= 0.68
35.00 Enter Length of Strip(ft) Sample"C"values:
2.00 Enter Slope(%or ft/100ft) 0.22 Dense grass
0.90 Enter Rational Method"C"value 0.28 Average grass
0.36 Poor grass
2.34 Result Tc(minutes) 0.48 Bare soil
0.90 Pavement
Shallow Concentrated Flow Time Pipe Flow Time 1
Source: SCS Velocity Graph as published in Virginia Erosion and Assumes 5 ft/s velocity in pipe
Sediment Control Handbook,Third Edition(Plate 5-2 on Page V-12) 0.00 Enter Length of Flow in Pipe(ft)(estimated)
Notes:
1)Not intended for well-defined channels-see channel flow calculation 0.00 Result Tc(minutes)
2)Calculate a separate Tc for each ground cover condition along the flow path
350.00 Enter Length of Flow(ft)
2.00 Enter Slope(%or ft/100ft)
2.57 Result Tc(minutes)IF UNPAVED
Result Tc(minutes)IF PAVED
Pipe Flow Time 2 Pipe Flow Time 3
Assumes 5 ft/s velocity in pipe Assumes 5 fUs velocity in pipe
0.00 Enter Length of Flow in Pipe(ft) 0.00 Enter Length of Flow in Pipe(ft)
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 1 Channel Flow Time 2
Source: Kirpich Chart as modified in VDOT Drainage Manual Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes: Notes:
1)For small drainage basins. 1)For small drainage basins.
2)For concrete channels,use 0.2*Tc 2)For concrete channels,use 0.2`Tc
0.00 Enter Length of Flow(ft) 0.00 Enter Length of Flow(ft)
30.00 Enter Height of most remote point along flow path above outlet 10.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 3
Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes::
1)For small drainage basins.
2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft)
1.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes)
•
RATIONAL METHOD 'y ORKSHEET Project: Shytle
Date: 7/17/2017
Designer: AGF
Watershed ID: DitchRl
Drainage Area: 1.29 Acres
c-factor: 0.50 (see worksheet)
tc: 11.72 mins. (see worksheet)
Q(2): 2.43 cfs
Q(10): 3.23 cfs
Time of Concentration Worksheet Weighted c-factor Worksheet
Overland Flow Time(from LS#3) Cover Type Area c areaxcn
Source: Seelye Chart as modified in VDOT Drainage Manual(Fig.1.5.1.1 Impervious 0.06 0.90 0.05
on Page 1-13E) Managed Turf 0.33 0.45 0.15
Notes: Impervious from LS#3 0.07 0.90 0.06
1)Length of overland flow always<=200 ft Managed Turf from LS#3 0.83 0.45 0.37
2)Calculate a separate Tc for each ground cover condition along the flow path 0.00
c-factor= 0.50
200.00 Enter Length of Strip(ft) Sample"C"values:
7.00 Enter Slope(%or ft/100ft) 0.22 Dense grass
0.30 Enter Rational Method"C"value 0.28 Average grass
0.36 Poor grass
11.51 Result Tc(minutes) 0.48 Bare soil
0.90 Pavement
Shallow Concentrated Flow Time Pipe Flow Time 1
Source: SCS Velocity Graph as published in Virginia Erosion and Assumes 5 ft/s velocity in pipe
Sediment Control Handbook,Third Edition(Plate 5-2 on Page V-12) 0.00 Enter Length of Flow in Pipe(ft)(estimated)
Notes:
1)Nof intended for well-defined channels-see channel flow calculation 0.00 Result Tc(minutes)
2)Calculate a separate Tc for each ground cover condition along the flow path
60.00 Enter Length of Flow(ft)
8.33 Enter Slope(%or ft/100ft)
0.21 Result Tc(minutes)IF UNPAVED
Result Tc(minutes)IF PAVED
Pipe Flow Time 2 Pipe Flow Time 3
Assumes 5 ft/s velocity in pipe Assumes 5 ft/s velocity in pipe
0.00 Enter Length of Flow in Pipe(ft) 0.00 Enter Length of Flow in Pipe(ft)
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 1 Channel Flow Time 2
Source: Kirpich Chart as modified in VDOT Drainage Manual Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes: Notes:
1)For small drainage basins. 1)For small drainage basins.
2)For concrete channels,use 0.2`Tc 2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft) 0.00 Enter Length of Flow(ft)
30.00 Enter Height of most remote point along flow path above outlet 10.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 3
Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes:
1)For small drainage basins.
2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft)
1.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes)
•
RATIONAL METHOD WORKSHEET ORKSHEE :1 Project: Shytle
Date: 7/17/2017
Designer: AGF
Watershed ID: Driveway Culvert
Drainage Area: 2.00 Acres
c-factor: 0.43 (see worksheet)
tc: 11.77 mins. (see worksheet)
Q(2): 3.23 cfs
Q(10): 4.29 cfs
Time of Concentration Worksheet Weighted c-factor Worksheet
Overland Flow Time(from LS#3) Cover Type Area c areaxcn
Source: Seelye Chart as modified in VDOT Drainage Manual(Fig.1.5.1.1 Impervious 0.13 0.90 0.12
on Page 1-13E) Managed Turf 1.16 0.45 0.52
Notes: Undeveloped Land 0.71 0.30 0.21
1)Length of overland flow always<=200 ft 0.00
2)Calculate a separate Tc for each ground cover condition along the flow path 0.00
c-factor= 0.43
200.00 Enter Length of Strip(ft) Sample"C"values:
7.00 Enter Slope(%or fU100ft) 0.22 Dense grass
0.30 Enter Rational Method"C"value 0.28 Average grass
0.36 Poor grass
11.51 Result Tc(minutes) 0.48 Bare soil
0.90 Pavement
Shallow Concentrated Flow Time Pipe Flow Time 1
Source: SCS Velocity Graph as published in Virginia Erosion and Assumes 5 Ws velocity in pipe
Sediment Control Handbook,Third Edition(Plate 5-2 on Page V-12) 0.00 Enter Length of Flow in Pipe(ft)(estimated)
Notes:
1)Not intended for well-defined channels-see channel flow calculation 0.00 Result Tc(minutes)
2)Calculate a separate Tc for each ground cover condition along the flow path
75.00 Enter Length of Flow(ft)
8.33 Enter Slope(%or fU100ft)
0.27 Result Tc(minutes)IF UNPAVED
Result Tc(minutes)IF PAVED
Pipe Flow Time 2 Pipe Flow Time 3
Assumes 5 ft/s velocity in pipe Assumes 5 ft/s velocity in pipe
0.00 Enter Length of Flow in Pipe(ft) 0.00 Enter Length of Flow in Pipe(ft)
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 1 Channel Flow Time 2
Source: Kirpich Chart as modified in VDOT Drainage Manual Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes: Notes:
1)For small drainage basins. 1)For small drainage basins.
2)For concrete channels,use 0.2*Tc 2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft) 0.00 Enter Length of Flow(ft)
30.00 Enter Height of most remote point along flow path above outlet 10.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes) 0.00 Result Tc(minutes)
Channel Flow Time 3
Source: Kirpich Chart as modified in VDOT Drainage Manual
Notes:
1)For small drainage basins.
2)For concrete channels,use 0.2*Tc
0.00 Enter Length of Flow(ft)
1.00 Enter Height of most remote point along flow path above outlet
0.00 Result Tc(minutes)
Culvert Report
Hydraflow Express Extension for Autodesk®AutoCAD®Civil 3D®by Autodesk,Inc. Monday,Jul 17 2017
18 Inch RCP Culvert
Invert Elev Dn (ft) = 733.00 Calculations
Pipe Length (ft) = 20.00 Qmin (cfs) = 4.00
Slope (%) = 1.25 Qmax (cfs) = 5.00
Invert Elev Up (ft) = 733.25 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 18.0
Shape = Circular Highlighted
Span (in) = 18.0 Qtotal (cfs) = 4.00
No. Barrels = 1 Qpipe (cfs) = 4.00
n-Value = 0.013 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 2.79
Culvert Entrance = Square edge w/headwall (C) Veloc Up (ft/s) = 4.39
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 HGL Dn (ft) = 734.13
HGL Up (ft) = 734.02
Embankment Hw Elev (ft) = 734.36
Top Elevation (ft) = 735.00 Hw/D (ft) = 0.74
Top Width (ft) = 19.00 Flow Regime = Inlet Control
Crest Width (ft) = 50.00
Elev(ft) 18 Inch RCP Culvert Hw Dean in)
736.00 275
735.50 2.25
735 00 1 75
736.50 1.25
-. Inlet control
736.00 075
7350 025
733.00 - -0.25
732.50 -0.75
0 2 4 6 8 10 12 Id 16 18 20 22 24 26 28
CiradarC0lvert HGL EmbanA
Re h Iftj