WMS:TR-55 Channel Flow Equation: Difference between revisions

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where:
where:


: T<sub>t</sub> – travel time (hr).
: <math>T_t</math> = travel time (hr).
: n = 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).
: L – flow path length (ft).
: <math>L</math> = flow path length (ft).
: P2 – 2year, 24 hour rainfall (in).
: <math>P_2</math> = 2year, 24 hour rainfall (in).
: s – 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.


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.
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.

Revision as of 00:06, 22 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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