roadway.c File Reference

Roadway overtopping flow calculations. More...

#include <math.h>
#include "headers.h"

Include dependency graph for roadway.c:

Macros
#define	_CRT_SECURE_NO_DEPRECATE

Enumerations
enum	RoadSurface {   PAVED = 1 ,   GRAVEL = 2 }

Functions
double	roadway_getInflow (int j, double dir, double hRoad, double h1, double h2)
	Compute signed roadway overtopping discharge and its head derivative.

Detailed Description

Roadway overtopping flow calculations.

Author

Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com (OpenSWMM maintenance and extensions)

Copyright

Copyright (c) 2026 Caleb Buahin. OpenSWMM contributions only; original EPA SWMM credits are retained.

License

Apache-2.0 for OpenSWMM contributions; original EPA SWMM provenance is retained.

Macro Definition Documentation

_CRT_SECURE_NO_DEPRECATE

#define _CRT_SECURE_NO_DEPRECATE

Enumeration Type Documentation

RoadSurface

enum RoadSurface

Enumerator
PAVED
GRAVEL

Function Documentation

roadway_getInflow()

double roadway_getInflow	(	int	j,
		double	dir,
		double	hRoad,
		double	h1,
		double	h2 )

Compute signed roadway overtopping discharge and its head derivative.

Parameters

[in]	j	Valid link index; non-WEIR links return zero without state updates.
[in]	dir	Flow direction multiplier, normally +1 or -1.
[in]	hRoad	Road crest elevation in feet.
[in]	h1	Higher/upstream hydraulic head in feet for the selected direction.
[in]	h2	Lower/downstream hydraulic head in feet.

Returns

Signed roadway discharge in cubic feet per second; zero without sufficient crest head. Uses HDS-5 coefficients when width/surface are available.

Postcondition

Updates Link.dqdh, newDepth and flowClass for a weir link.