Culvert.hpp File Reference

Culvert inlet control — FHWA HEC-5 equations. More...

#include <vector>

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Classes
struct	openswmm::culvert::CulvertCoeffs

Namespaces
namespace	openswmm
namespace	openswmm::culvert

Functions
CulvertCoeffs	openswmm::culvert::getCoeffs (int culvert_code)
	Copy an FHWA culvert inlet coefficient record.
double	openswmm::culvert::getInflow (double q0, double y, const XSectParams &xs, double slope, int code, double &dqdh, bool &controls)
	Apply an FHWA inlet-capacity limit to a proposed conduit flow.

Detailed Description

Culvert inlet control — FHWA HEC-5 equations.

Three flow regimes:

• Unsubmerged (y <= 0.95*yFull): Q = AD * (h/yFull/K)^(1/M)
• Transition: linear interpolation
• Submerged (y >= y2): Q = AD * sqrt((h/yFull - Y + scf) / C)

Batch: classify all culverts by regime, compute flow per regime group.

Note

Legacy reference: src/legacy/engine/culvert.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