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Permissible Velocity Procedure: Vegetated Channel
Recommended for design of vegetative channels
User Input Data
Calculated Value
Reference Data
Designed By: |  | Date:
Checked By: |  | Date:
Company:
Project Name:
Project No.:
Site Location (City/Town) | Raleigh
Channel/Waterway Id. | 101
Design storm | 10-yr
[NAME], Q (cfs) | 16.6
Slope (ft/ft) | 0.02
Channel geometry: V, Parabolic, or Trapezoidal | Trapezoidal
Channel lining | Tall Fescue
Permissible velocity (ft/s) | 4.5 | Table 8.05a
Channel flow area (ft2) "first try" | 3.688888888888889
See table below for Steps 5-9…
Trapezoidal | [NAME], Z | [NAME], b | [NAME]. Depth, d | [NAME], T | Cross-sectional area, A | Wetted Perimeter, P | [NAME], R | [NAME], VR | Retardance Class | Manning's Coefficient, n | Velocity, V | Velocity Check | Channel Capacity, Q | Capacity Check
Figure 8.05b |  | (ft) | (ft) | (ft) | (ft2) | (ft) | (ft) |  |  |  | (ft/s) |  | (cfs)
 |  |  |  |  |  |  |  |  |  | Structural Table 8.05b
 | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05c | Vegetated Table 8.05c | Vegetated Fig. 8.05c | Fig. 8.05a |  | Fig. 8.05a
 | 3 | 3 | 0.8 | 7.800000000000001 | 4.32 | 8.059644256269408 | 0.5360038064508336 | 2.412017129028751 | D | 0.043 | 3.233538676322831 | PROCEED | 13.96888708171463 | REVISE DESIGN
 | 3 | 3 | 0.9 | 8.4 | 5.130000000000001 | 8.692099788303082 | 0.5901911074356759 | 2.655859983460542 | D | 0.042 | 3.530046424213126 | PROCEED | 18.10913815621334 | PROCEED
 |  |  |  | 0 | 0 | 0
 |  |  |  | 0 | 0 | 0
Trapezoidal--[NAME] | [NAME], Z | [NAME], b | [NAME]. Depth, d | [NAME], T | Cross-sectional area, A | Wetted Perimeter, P | [NAME], R | Trial Velocity, Vt | [NAME], VR | Retardance Class | Manning's Coefficient, n | Velocity, V | Velocity Check | Channel Capacity, Q | Channel Capacity Check
Figure 8.05b | (ft/ft) | (ft) | (ft) | (ft) | (ft2) | (ft) | (ft) | (ft/s) |  |  |  | (ft/s) |  | (cfs)
 | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b |  | Fig. 8.05c | Vegetated Table 8.05c | Vegetated Fig. 8.05c | Fig. 8.05a |  | Fig. 8.05a
 | 3 | 3 | 1.5 | 12 | 11.25 | 12.48683298050514 | 0.9009490250701581 | 3 | 2.702847075210474 | B | 0.08 | 2.5 | REVISE DESIGN | 28.125 | PROCEED
 | 3 | 3 | 1.5 | 12 | 11.25 | 12.48683298050514 | 0.9009490250701581 | 2 | 1.801898050140316 | B | 0.11 | 1.8 | REVISE DESIGN | 20.25 | PROCEED
 | 3 | 3 | 1.5 | 12 | 11.25 | 12.48683298050514 | 0.9009490250701581 | 1.6 | 1.441518440112253 | B | 0.12 | 1.6 | PROCEED | 18 | PROCEED
 | 3 | 3 | 1.5 | 12 | 11.25 | 12.48683298050514 | 0.9009490250701581 | 1.5 | 1.351423537605237 | B | 0.13 | 1.5 | PROCEED | 16.875 | PROCEED
Steps 5-9:
V-Shaped | [NAME], Z | [NAME]. Depth, d | [NAME], T | Cross-sectional area, A | Wetted Perimeter, P | [NAME], R | [NAME], VR | Retardance Class | Manning's Coefficient, n | Velocity, V | Velocity Check | Channel Capacity, Q | Channel Capacity Check
Figure 8.05b |  | (ft) | (ft) | (ft2) | (ft) | (ft) |  |  |  | (ft/s) |  | (cfs)
 |  |  |  |  |  |  |  |  | Structural Table 8.05b
 | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05c | Vegetated Table 8.05c | Vegetated Fig. 8.05c | Fig. 8.05a |  | Fig. 8.05a
 | 3 | 1 | 6 | 3 | 6.324555320336759 | 0.4743416490252569 | 2.134537420613656 | D | 0.044 | 2.912791704849223 | PROCEED | 8.73837511454767 | REVISE DESIGN
 | 3 | 1.2 | 7.199999999999999 | 4.32 | 7.58946638440411 | 0.5692099788303082 | 2.561444904736387 | D | 0.042 | 3.445881294603206 | PROCEED | 14.88620719268585 | REVISE DESIGN
 | 3 | 1.3 | 7.800000000000001 | 5.07 | 8.221921916437788 | 0.6166441437328339 | 2.774898646797753 | D | 0.041 | 3.72340676747636 | PROCEED | 18.87767231110515 | PROCEED
 |  |  | 0 | 0 | 0 | 0 | 0
Step 10:
V-Shaped--[NAME] | [NAME], Z | [NAME]. Depth, d | [NAME], T | Cross-sectional area, A | Wetted Perimeter, P | [NAME], R | Trial Velocity, Vt | [NAME], VR | Retardance Class | Manning's Coefficient, n | Velocity, V | Velocity Check | Channel Capacity, Q | Channel Capacity Check
Figure 8.05b | (ft/ft) | (ft) | (ft) | (ft2) | (ft) | (ft) | (ft/s) |  |  |  | (ft/s) |  | (cfs)
 | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b |  | Fig. 8.05c | Vegetated Table 8.05c | Vegetated Fig. 8.05c | Fig. 8.05a |  | Fig. 8.05a
 | 3 | 2 | 12 | 12 | 12.64911064067352 | 0.9486832980505138 | 3 | 2.846049894151541 | B | 0.08 | 2.5 | REVISE DESIGN | 30 | PROCEED
 | 3 | 2 | 12 | 12 | 12.64911064067352 | 0.9486832980505138 | 2.5 | 2.371708245126285 | B | 0.09 | 2.3 | REVISE DESIGN | 27.6 | PROCEED
 | 3 | 2 | 12 | 12 | 12.64911064067352 | 0.9486832980505138 | 2.3 | 2.181971585516182 | B | 0.091 | 2.2 | REVISE DESIGN | 26.4 | PROCEED
 | 3 | 2 | 12 | 12 | 12.64911064067352 | 0.9486832980505138 | 2.2 | 2.08710325571113 | B | 0.092 | 2.2 | PROCEED | 26.4 | PROCEED
Steps 5-9:
Parabolic | [NAME], T | [NAME]. Depth, d | Cross-sectional area, A | Wetted Perimeter, P | [NAME], R | [NAME], VR | Retardance Class | Manning's Coefficient, n | Velocity, V | Velocity Check | Channel Capacity, Q | Channel Capacity Check
Figure 8.05b | (ft) | (ft) | (ft2) | (ft) | (ft) |  |  |  | (ft/s) |  | (cfs)
 |  |  |  |  |  |  |  | Structural Table 8.05b
 | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05c | Vegetated Table 8.05c | Vegetated Fig. 8.05c | Fig. 8.05a |  | Fig. 8.05a
 | 5 | 1 | 3.333333333333333 | 5.533333333333333 | 0.6024096385542169 | 2.710843373493976 | D | 0.042 | 3.578600765417787 | PROCEED | 11.92866921805929 | REVISE DESIGN
 | 6 | 1 | 4 | 6.444444444444445 | 0.6206896551724138 | 2.793103448275862 | D | 0.041 | 3.739674023469079 | PROCEED | 14.95869609387632 | REVISE DESIGN
 | 7 | 1 | 4.666666666666666 | 7.380952380952381 | 0.632258064516129 | 2.84516129032258 | D | 0.041 | 3.785997543776038 | PROCEED | 17.66798853762151 | PROCEED
 |  |  | 0 |  |  |  | D
Step 10:
Parabolic--Grass Lined | [NAME], T | [NAME]. Depth, d | Cross-sectional area, A | Wetted Perimeter, P | [NAME], R | Trial Velocity, Vt | [NAME], VR | Retardance Class | Manning's Coefficient, n | Velocity, V | Velocity Check | Channel Capacity, Q | Channel Capacity Check
Figure 8.05b | (ft) | (ft) | (ft2) | (ft) | (ft) | (ft/s) |  |  |  | (ft/s) |  | (cfs)
or See Tables 8.05i-y | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b | Fig. 8.05b |  | Fig. 8.05c | Vegetated Table 8.05c | Vegetated Fig. 8.05c | Fig. 8.05a |  | Fig. 8.05a
 |  |  | 0 |  |  |  |  | B
 | 0 | 0 | 0 |  |  |  |  | B
 | 0 | 0 | 0 |  |  |  |  | B
 | 0 | 0 | 0 |  |  |  |  | B
Table 8.05d