Roadway.hpp File Reference

Roadway weir overflow — FHWA HDS-5 (legacy roadway.c, op for op). More...

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Namespaces
namespace	openswmm
namespace	openswmm::roadway

Functions
double	openswmm::roadway::getInflow (double dir, double h_road, double h1, double h2, double cd_user, bool si, double road_width, int road_surf, double length, double &dqdh, double &depth)
	legacy roadway_getInflow: flow across a roadway weir.

Variables
constexpr int	openswmm::roadway::SURFACE_NONE = 0
	legacy roadway.c RoadSurface: 0 = none (user Cd), 1 = PAVED, 2 = GRAVEL.
constexpr int	openswmm::roadway::SURFACE_PAVED = 1
constexpr int	openswmm::roadway::SURFACE_GRAVEL = 2

Detailed Description

Roadway weir overflow — FHWA HDS-5 (legacy roadway.c, op for op).

Q = Cd * L * hWr^1.5 over the road crest. With a road width and surface the coefficient is the HDS-5 curve value: Cr from the HEAD (ft) when head / width <= 0.15, from the ratio above that, times the submergence factor Kt(ht / hWr); without them the user's Cd (SI decks: / 0.552).

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 Caleb Buahin. All rights reserved.

License

Apache-2.0