openswmm::infil Namespace Reference

Functions
void	horton_init (HortonState &state, double f0, double fmin, double decay, double regen, double Fmax, const SimulationOptions &opts)
	Initialise Horton parameters from user input.
double	horton_getInfil (HortonState &state, double precip, double depth, double dt)
	Compute Horton infiltration rate for one timestep.
double	modHorton_getInfil (HortonState &state, double precip, double depth, double dt)
	Compute Modified Horton infiltration rate for one timestep.
void	grnampt_init (GreenAmptState &state, double S, double Ks, double IMD, const SimulationOptions &opts)
	Initialise Green-Ampt parameters.
double	grnampt_getInfil (GreenAmptState &state, double precip, double depth, double dt)
	Compute Green-Ampt infiltration rate.
void	curvenum_init (CurveNumState &state, double CN, double regen)
	Initialise Curve Number parameters.
double	curvenum_getInfil (CurveNumState &state, double precip, double depth, double dt)
	Compute SCS Curve Number infiltration rate.

Function Documentation

curvenum_getInfil()

double openswmm::infil::curvenum_getInfil	(	CurveNumState &	state,
		double	precip,
		double	depth,
		double	dt
	)

Compute SCS Curve Number infiltration rate.

Parameters

state	[in/out] CN state.
precip	Rainfall rate (ft/sec).
depth	Ponded depth (ft).
dt	Timestep (seconds).

Returns

Infiltration rate (ft/sec).

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curvenum_init()

void openswmm::infil::curvenum_init	(	CurveNumState &	state,
		double	CN,
		double	regen
	)

Initialise Curve Number parameters.

Parameters

state	[out] State to initialise.
CN	SCS Curve Number (1-100).
regen	Regeneration rate.

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grnampt_getInfil()

double openswmm::infil::grnampt_getInfil	(	GreenAmptState &	state,
		double	precip,
		double	depth,
		double	dt
	)

Compute Green-Ampt infiltration rate.

Parameters

state	[in/out] Green-Ampt state.
precip	Rainfall rate (ft/sec).
depth	Ponded depth (ft).
dt	Timestep (seconds).

Returns

Infiltration rate (ft/sec).

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grnampt_init()

void openswmm::infil::grnampt_init	(	GreenAmptState &	state,
		double	S,
		double	Ks,
		double	IMD,
		const SimulationOptions &	opts
	)

Initialise Green-Ampt parameters.

Parameters

state	[out] State to initialise.
S	Suction head (in or mm).
Ks	Hydraulic conductivity (in/hr or mm/hr).
IMD	Initial moisture deficit (0-1).
opts	Simulation options (for unit system).

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horton_getInfil()

double openswmm::infil::horton_getInfil	(	HortonState &	state,
		double	precip,
		double	depth,
		double	dt
	)

Compute Horton infiltration rate for one timestep.

Parameters

state	[in/out] Horton state for this subcatchment.
precip	Rainfall rate (ft/sec).
depth	Ponded depth (ft).
dt	Timestep (seconds).

Returns

Infiltration rate (ft/sec).

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horton_init()

void openswmm::infil::horton_init	(	HortonState &	state,
		double	f0,
		double	fmin,
		double	decay,
		double	regen,
		double	Fmax,
		const SimulationOptions &	opts
	)

Initialise Horton parameters from user input.

Parameters

state	[out] State to initialise.
f0	Max infiltration rate (in/hr or mm/hr — converted internally).
fmin	Min infiltration rate.
decay	Decay constant (1/hr).
regen	Regeneration constant (1/hr).
Fmax	Max cumulative infiltration (0 = unlimited).
opts	Simulation options (for unit system).

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modHorton_getInfil()

double openswmm::infil::modHorton_getInfil	(	HortonState &	state,
		double	precip,
		double	depth,
		double	dt
	)

Compute Modified Horton infiltration rate for one timestep.

Modified Horton uses a linear decay formula: fp = f0 - kd * Fe instead of the exponential decay of standard Horton.

Parameters

state	[in/out] Horton state for this subcatchment.
precip	Rainfall rate (ft/sec).
depth	Ponded depth (ft).
dt	Timestep (seconds).

Returns

Infiltration rate (ft/sec).

Note

Legacy reference: infil.c — modHorton_getInfil()

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