WMS:TR-55 Sheet Flow Equation: Difference between revisions
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: <math>n</math> = Manning’s roughness coefficient (see Table 3-1 of the TR-55). | : <math>n</math> = Manning’s roughness coefficient (see Table 3-1 of the TR-55). | ||
: <math>L</math> = flow path length (ft). | : <math>L</math> = flow path length (ft). | ||
: <math> | : <math>P_2</math> = 2year, 24 hour rainfall (in). | ||
: <math>s</math> = slope of the hydraulic grade line (ground slope) in ft/ft. | : <math>s</math> = slope of the hydraulic grade line (ground slope) in ft/ft. | ||
Revision as of 23:43, 21 February 2013
Sheet flow generally occurs in the headwater of streams. The following equation is used to describe sheet flow:
where:
- = travel time (hr).
- = Manning’s roughness coefficient (see Table 3-1 of the TR-55).
- = flow path length (ft).
- = 2year, 24 hour rainfall (in).
- = slope of the hydraulic grade line (ground slope) in ft/ft.
2 year, 24 hour rainfall values can be determined from the map in appendix B-4 of the TR-55 reference manual for eastern US locations and from the NOAA Atlas 2 maps for the western US locations.
Generally the sheet flow equation should not be used for lengths greater than 300 feet.
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