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

From XMS Wiki
Jump to navigationJump to search
No edit summary
 
No edit summary
Line 7: Line 7:
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>P2</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 23:43, 21 February 2013

Sheet flow generally occurs in the headwater of streams. The following equation is used to describe sheet flow:


File:WMSEqation132.png


where:

</math>T_t</math> = travel time (hr).
</math>n</math> = Manning’s roughness coefficient (see Table 3-1 of the TR-55).
</math>L</math> = flow path length (ft).
</math>P2</math> = 2year, 24 hour rainfall (in).
</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.

Generally the sheet flow equation should not be used for lengths greater than 300 feet.

Related Topics


v • e
WMS – Watershed Modeling System
Modules:Terrain Data  •   Drainage  •   Map  •   Hydrologic Modeling  •   River  •   GIS  •   2D Grid  •   2D ScatterWMS.PNG
Models:CE-QUAL-W2  •   GSSHA  •   HEC-1  •   HEC-HMS  •   HEC-RAS  •   HSPF  •   MODRAT  •   NSS  •   OC Hydrograph  •   OC Rational  •   Rational  •   River Tools  •   Storm Drain  •   SMPDBK  •   SWMM  •   TR-20  •   TR-55
Toolbars:Modules  •   Macros  •   Units   •   Digitize  •   Static Tools  •   Dynamic Tools  •   Drawing  •   Get Data Tools
Aquaveo
Retrieved from "https://www.xmswiki.com/index.php?title=WMS:TR-55_Sheet_Flow_Equation&oldid=44305"