openswmm_inflows.h File Reference

OpenSWMM Engine — Inflows (External, DWF, RDII) C API. More...

#include "openswmm_engine.h"

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Functions
SWMM_ENGINE_API int	swmm_ext_inflow_add (SWMM_Engine engine, int node_idx, const char *constituent, const char *ts_name, const char *type, double m_factor, double s_factor, double baseline, const char *pattern)
	Add an external inflow to a node.
SWMM_ENGINE_API int	swmm_dwf_add (SWMM_Engine engine, int node_idx, const char *constituent, double avg_value, const char *pat1, const char *pat2, const char *pat3, const char *pat4)
	Add a dry weather flow component to a node.
SWMM_ENGINE_API int	swmm_rdii_add (SWMM_Engine engine, int node_idx, const char *uh_name, double area)
	Add RDII inflow to a node using a unit hydrograph.
SWMM_ENGINE_API int	swmm_ext_inflow_count (SWMM_Engine engine)
	Get the total number of external inflows defined.
SWMM_ENGINE_API int	swmm_dwf_count (SWMM_Engine engine)
	Get the total number of dry weather flow entries defined.
SWMM_ENGINE_API int	swmm_rdii_count (SWMM_Engine engine)
	Get the total number of RDII entries defined.

Detailed Description

OpenSWMM Engine — Inflows (External, DWF, RDII) C API.

External inflow addition, dry weather flow, RDII assignment, and count queries.

See also

openswmm_engine.h

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

Function Documentation

swmm_dwf_add()

SWMM_ENGINE_API int swmm_dwf_add	(	SWMM_Engine	engine,
		int	node_idx,
		const char *	constituent,
		double	avg_value,
		const char *	pat1,
		const char *	pat2,
		const char *	pat3,
		const char *	pat4
	)

Add a dry weather flow component to a node.

Dry weather flow represents the base sanitary flow entering the system at a node, modulated by up to four time patterns.

Parameters

engine	Engine handle.
node_idx	Zero-based index of the receiving node.
constituent	Constituent name ("FLOW" or a pollutant name).
avg_value	Average DWF value.
pat1	Monthly time pattern name (NULL for none).
pat2	Daily time pattern name (NULL for none).
pat3	Hourly time pattern name (NULL for none).
pat4	Weekend time pattern name (NULL for none).

Returns

SWMM_OK on success, or an error code.

swmm_dwf_count()

SWMM_ENGINE_API int swmm_dwf_count

(

SWMM_Engine

engine

)

Get the total number of dry weather flow entries defined.

Parameters

engine

Engine handle.

Returns

Number of DWF entries, or -1 on error.

swmm_ext_inflow_add()

SWMM_ENGINE_API int swmm_ext_inflow_add	(	SWMM_Engine	engine,
		int	node_idx,
		const char *	constituent,
		const char *	ts_name,
		const char *	type,
		double	m_factor,
		double	s_factor,
		double	baseline,
		const char *	pattern
	)

Add an external inflow to a node.

External inflows define time-varying flows or pollutant loads applied at a node, optionally driven by a time series, with scaling, baseline, and pattern modifiers.

Parameters

engine	Engine handle.
node_idx	Zero-based index of the receiving node.
constituent	Constituent name ("FLOW" for flow, or a pollutant name).
ts_name	Time series name (NULL or "" for constant baseline only).
type	Inflow type: "FLOW", "CONCEN", or "MASS".
m_factor	Multiplier applied to the time series values.
s_factor	Scale factor (unit conversion).
baseline	Constant baseline value added to the time series.
pattern	Time pattern name (NULL or "" for none).

Returns

SWMM_OK on success, or an error code.

swmm_ext_inflow_count()

SWMM_ENGINE_API int swmm_ext_inflow_count

(

SWMM_Engine

engine

)

Get the total number of external inflows defined.

Parameters

engine

Engine handle.

Returns

Number of external inflows, or -1 on error.

swmm_rdii_add()

SWMM_ENGINE_API int swmm_rdii_add	(	SWMM_Engine	engine,
		int	node_idx,
		const char *	uh_name,
		double	area
	)

Add RDII inflow to a node using a unit hydrograph.

Associates a node with a unit hydrograph group and its sewershed area to compute rainfall-dependent infiltration/inflow.

Parameters

engine	Engine handle.
node_idx	Zero-based index of the receiving node.
uh_name	Unit hydrograph group name.
area	Sewershed area in project area units.

Returns

SWMM_OK on success, or an error code.

swmm_rdii_count()

SWMM_ENGINE_API int swmm_rdii_count

(

SWMM_Engine

engine

)

Get the total number of RDII entries defined.

Parameters

engine

Engine handle.

Returns

Number of RDII entries, or -1 on error.