Landuse.hpp File Reference

Pollutant buildup and washoff per land use — batch SoA. More...

#include <vector>

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Classes
struct	openswmm::landuse::BuildupParams
struct	openswmm::landuse::WashoffParams
struct	openswmm::landuse::SurfaceQualitySoA
class	openswmm::landuse::LanduseSolver

Namespaces
namespace	openswmm
namespace	openswmm::landuse

Enumerations
enum class	openswmm::landuse::BuildupType : int {   openswmm::landuse::NONE = 0 ,   openswmm::landuse::POWER = 1 ,   openswmm::landuse::EXPON = 2 ,   openswmm::landuse::SATUR = 3 ,   openswmm::landuse::EXTERNAL = 4 }
enum class	openswmm::landuse::WashoffType : int {   openswmm::landuse::NONE = 0 ,   openswmm::landuse::EXPON = 1 ,   openswmm::landuse::RATING = 2 ,   openswmm::landuse::EMC = 3 }

Detailed Description

Pollutant buildup and washoff per land use — batch SoA.

Each subcatchment can have multiple land uses, each with per- pollutant buildup and washoff functions. The buildup/washoff equations are pure arithmetic — vectorisable across all (subcatchment × landuse × pollutant) triples.

Buildup models:

• Power: B(t) = min(c0, c1 * t^c2)
• Exponential: B(t) = c0 * (1 - exp(-c1 * t))
• Saturation: B(t) = c0 * t / (c2 + t)

Washoff models:

• Exponential: W = k * Q^n * B
• Rating curve: W = k * Q^n
• EMC: W = constant concentration

All models are applied identically per element — vectorisable.

Note

Legacy reference: src/legacy/engine/landuse.c, surfqual.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