Roadway.hpp File Reference

Roadway weir overflow — FHWA HDS-5. More...

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Namespaces
namespace	openswmm
namespace	openswmm::roadway

Enumerations
enum class	openswmm::roadway::SurfaceType : int {   openswmm::roadway::PAVED = 0 ,   openswmm::roadway::GRAVEL = 1 }

Functions
double	openswmm::roadway::getFlow (double head_up, double head_down, double road_width, double road_length, SurfaceType surface, double &dqdh)
	Compute roadway weir overflow.
double	openswmm::roadway::getDischargeCoeff (double hw_ratio, SurfaceType surface)
	Get discharge coefficient Cr from head/width ratio.
double	openswmm::roadway::getSubmergenceFactor (double ht_ratio, SurfaceType surface)
	Get submergence correction factor Kt.

Detailed Description

Roadway weir overflow — FHWA HDS-5.

Q = Cd * L * hWr^1.5 where Cd depends on head/width ratio and road surface type (paved/gravel). Submergence correction factor Kt applied when tailwater is significant.

Note

Legacy reference: src/legacy/engine/roadway.c

Author

Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com

Copyright

Copyright (c) 2026 HydroCouple. All rights reserved.

License\n MIT License