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Grassed Waterway Design Information Sheet

Author: Robert P. Stone, P. Eng.-Engineer, Soil/OMAFRA
Creation Date: 13 June 2007
Last Reviewed: 4 April 2008
  1. Watershed area
________ ha
________ ac
  1. Average grade of watershed
________ %
  1. Runoff curve number from Tables 2.2 — 2.4
________________
  1. Peak flow from watershed for a 10 year storm from
    Table 2.5-M — 2.11-M (2.5-I — 2.11-I)
________ m3/s
________ft3/s
  1. Waterway length
________ m
________ ft
  1. Elevation difference throughout waterway length
________ m
________ ft
  1. Average grade of waterway =
    (Elevation difference (6) ÷ Waterway length (5)) x 100

    (_______m (ft) ÷ _______m (ft)) x 100
________ %
  1. Soil texture at waterway location
  
  1. Erodibility of soil at waterway location from Table 4.1
 
  1. Waterway vegetative cover
  
  1. Permissible velocity of flow from Table 4.2
________m/s
________ft/s
  1. Waterway dimensions from
    Table 4.4-M — 4.9-M (4.4-I — 4.9-I)
T =________ m
D =________ m
________ ft
________ ft
  1. Add 0.1 m (0.3 ft) minimum freeboard to give new waterway dimensions
T =________ m
________ ft
D = ________ m
________ ft
  1. Are waterway dimensions suitable for crossing with farm equipment? e.g. minimum side slope 10 horiziontal:1 vertical
    If NO repeat steps (12) to (14) and adjust waterway dimensions.
    If YES go to step (15).
_______ No
_______ Yes
  1. Final waterway dimensions from step (13).
T =________ m
D =________ m
________ ft
________ ft

 

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