Public C API implementation for LID node configuration. More...

#include "openswmm_api_common.hpp"
#include "../../../include/openswmm/engine/openswmm_infrastructure.h"
#include "../hydrology/LidNode.hpp"
#include "../hydraulics/Node.hpp"
#include "UnitConversion.hpp"
#include <algorithm>
#include <cmath>

Include dependency graph for openswmm_lid_nodes_impl.cpp:

Functions
SWMM_ENGINE_API int	swmm_lid_node_layer_count (SWMM_Engine engine, int control)
	Count authored or derived stack layers, including a BOTTOM row when present.

SWMM_ENGINE_API int	swmm_lid_node_layer_get (SWMM_Engine engine, int control, int row, SWMM_LidNodeLayer *out)
	Read one authored or derived NODE layer.

SWMM_ENGINE_API int	swmm_lid_node_layers_set (SWMM_Engine engine, int control, const SWMM_LidNodeLayer *rows, int count)
	Replace NODE layers while preserving compatible treatment and flow settings.

SWMM_ENGINE_API int	swmm_lid_node_treatment_count (SWMM_Engine engine, int control)
	Count per-layer treatment rows flattened top-to-bottom.

SWMM_ENGINE_API int	swmm_lid_node_treatment_get (SWMM_Engine engine, int control, int row, SWMM_LidLayerTreatment *out)
	Read a flattened per-layer treatment row.

SWMM_ENGINE_API int	swmm_lid_node_configure (SWMM_Engine engine, int control, const SWMM_LidNodeLayer rows, int count, const SWMM_LidLayerTreatment treatments, int nt)
	Atomically configure a NODE control stack and treatment.

SWMM_ENGINE_API int	swmm_node_get_lid (SWMM_Engine engine, int node, int control, double saturation)
	Read a node LID-control assignment and initial saturation.

SWMM_ENGINE_API int	swmm_lid_richards_options_get (SWMM_Engine engine, int control, SWMM_LidRichardsOptions *out)
	Read a control's Richards options.

SWMM_ENGINE_API int	swmm_lid_richards_material_get (SWMM_Engine engine, int control, int row, SWMM_LidRichardsMaterial *out)
	Read a control's Richards material.

SWMM_ENGINE_API int	swmm_lid_node_configure_flow (SWMM_Engine engine, int control, const SWMM_LidNodeLayer rows, int count, const SWMM_LidLayerTreatment treatment, int nt, const SWMM_LidRichardsOptions options, const SWMM_LidRichardsMaterial material)
	Atomically configure a NODE control stack, treatment and flow formulation.

SWMM_ENGINE_API int	swmm_node_set_lid (SWMM_Engine engine, int node, int control, double saturation)
	Assign or clear a storage-node LID and synchronize its geometry.

SWMM_ENGINE_API int	swmm_node_get_lid_bottom (SWMM_Engine engine, int node, int *mode)
	Read a node's bottom exchange ownership mode.

SWMM_ENGINE_API int	swmm_node_set_lid_bottom (SWMM_Engine engine, int node, int mode)
	Select bottom ownership for one assigned storage LID.

SWMM_ENGINE_API int	swmm_lid_node_base_area (SWMM_Engine engine, int node, double *area)
	Read the authored geometric area at a storage LID base.

SWMM_ENGINE_API int	swmm_lid_node_outlet_get (SWMM_Engine engine, int link, int layer, int top)
	Read a link's LID layer anchor.

SWMM_ENGINE_API int	swmm_lid_node_outlet_set (SWMM_Engine engine, int link, int layer, int top)
	Set or remove a link's LID layer anchor.

SWMM_ENGINE_API int	swmm_lid_node_state_count (SWMM_Engine engine, int node)
	Count initialized runtime profile cells.

SWMM_ENGINE_API int	swmm_lid_node_state_get (SWMM_Engine engine, int node, int row, int layer, double bottom, double top, double moisture)
	Read one initialized LID profile cell.

SWMM_ENGINE_API int	swmm_lid_richards_state_get (SWMM_Engine engine, int node, int row, double pressure, double head, double *water)
	Read one Richards cell's pressure, total head and complete water volume.

SWMM_ENGINE_API int	swmm_lid_richards_statistics_get (SWMM_Engine engine, int node, SWMM_LidRichardsStatistics *out)
	Read the last stored Richards adaptive-solver report.

SWMM_ENGINE_API int	swmm_lid_node_bottom_state_get (SWMM_Engine engine, int node, SWMM_LidBottomState *out)
	Read the last accepted LID-to-mesh exchange diagnostics without advancing time.

Detailed Description

Public C API implementation for LID node configuration.

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

Function Documentation

◆ swmm_lid_node_base_area()

SWMM_ENGINE_API int swmm_lid_node_base_area	(	SWMM_Engine	engine,
		int	node,
		double *	area )

Read the authored geometric area at a storage LID base.

Requires BUILDING/OPENED, assigned storage LID, and no initialized runtime cells. Uses geometry at depth zero without pore/retained-water factors; rejects nonfinite/negative computed area. Zero requires explicit positive area when creating a connection.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[out]	area	Non-null contact-area destination in project square-length units, ft2 or m2; may be zero.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments. SWMM_ERR_LIFECYCLE outside BUILDING/OPENED.

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◆ swmm_lid_node_bottom_state_get()

SWMM_ENGINE_API int swmm_lid_node_bottom_state_get	(	SWMM_Engine	engine,
		int	node,
		SWMM_LidBottomState *	out )

Read the last accepted LID-to-mesh exchange diagnostics without advancing time.

Requires an initialized explicit MESH_AQUIFER bottom connection with receipts enabled and a 2D-enabled build; otherwise BADPARAM. Current aquifer and sample timestamps can differ. Classical samples use mobile LID head; Richards uses bottom porous total head. Pending gross up/down transfers remain separate.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[out]	out	Non-null caller-owned SI diagnostics struct; preserved on failure. Positive net volume/rate is LID to aquifer; valid_sample=0 before the first completed sample.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

◆ swmm_lid_node_configure()

SWMM_ENGINE_API int swmm_lid_node_configure	(	SWMM_Engine	engine,
		int	control,
		const SWMM_LidNodeLayer *	layers,
		int	count,
		const SWMM_LidLayerTreatment *	treatment,
		int	treatment_count )

Atomically configure a NODE control stack and treatment.

Requires BUILDING/OPENED and a NODE control. Validates stack, treatment expressions and outlet anchors before retaining the edit; rejects edits that orphan an anchored layer. Synchronizes dependent MaxDepths/outlet offsets. Preserves existing flow/retention settings, requiring compatible layer count/kinds when those settings are active.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.
[in]	layers	Non-null borrowed array of count layers, copied synchronously. See SWMM_LidNodeLayerKind for parameter positions/units; unused params must be zero.
[in]	count	Positive authored layer count, including optional final BOTTOM. SURFACE may occur only first; at least one MEDIA/AGGREGATE is required.
[in]	treatment	Borrowed treatment_count rows, required if treatment_count>0; expressions are copied. Layer is one-based, cannot target BOTTOM; each layer/pollutant key must be unique.
[in]	treatment_count	Nonnegative number of treatment rows; zero clears treatment.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments. SWMM_ERR_LIFECYCLE outside BUILDING/OPENED.

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◆ swmm_lid_node_configure_flow()

SWMM_ENGINE_API int swmm_lid_node_configure_flow	(	SWMM_Engine	engine,
		int	control,
		const SWMM_LidNodeLayer *	layers,
		int	count,
		const SWMM_LidLayerTreatment *	treatment,
		int	treatment_count,
		const SWMM_LidRichardsOptions *	options,
		const SWMM_LidRichardsMaterial *	material )

Atomically configure a NODE control stack, treatment and flow formulation.

Requires BUILDING/OPENED and a NODE control. Validates stack, treatment expressions and outlet anchors before retaining the edit; rejects edits that orphan an anchored layer. Synchronizes dependent MaxDepths/outlet offsets. Richards requires SURFACE first and valid retention on every porous layer; invalid configuration leaves stack and dependent geometry unchanged.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.
[in]	layers	Non-null borrowed array of count layers, copied synchronously. See SWMM_LidNodeLayerKind for parameter positions/units; unused params must be zero.
[in]	count	Positive authored layer count, including optional final BOTTOM. SURFACE may occur only first; at least one MEDIA/AGGREGATE is required.
[in]	treatment	Borrowed treatment_count rows, required if treatment_count>0; expressions are copied. Layer is one-based, cannot target BOTTOM; each layer/pollutant key must be unique.
[in]	treatment_count	Nonnegative number of treatment rows; zero clears treatment.
[in]	options	Non-null flow options: model=0 classical/backwater, model=1 Richards. Richards requires finite positive tolerances/max_step and cells_per_layer in [1,256].
[in]	material	Borrowed array with count entries; required for Richards. Porous rows use residual theta, inverse-metre alpha/specific-storage in BOTH unit systems, n>1 and l>=0; SURFACE/BOTTOM rows are ignored.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments. SWMM_ERR_LIFECYCLE outside BUILDING/OPENED.

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◆ swmm_lid_node_layer_count()

SWMM_ENGINE_API int swmm_lid_node_layer_count	(	SWMM_Engine	engine,
		int	control )

Count authored or derived stack layers, including a BOTTOM row when present.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.

Returns: Nonnegative row count; -1 for null engine or invalid control.

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◆ swmm_lid_node_layer_get()

SWMM_ENGINE_API int swmm_lid_node_layer_get	(	SWMM_Engine	engine,
		int	control,
		int	row,
		SWMM_LidNodeLayer *	out )

Read one authored or derived NODE layer.

No lifecycle check. Uses the derived stack for conventional controls as well as explicitly authored NODE stacks.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.
[in]	row	Zero-based row index in the selected profile/table.
[out]	out	Non-null caller-owned output receiving kind and all seven input-unit parameters.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

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◆ swmm_lid_node_layers_set()

SWMM_ENGINE_API int swmm_lid_node_layers_set	(	SWMM_Engine	engine,
		int	control,
		const SWMM_LidNodeLayer *	rows,
		int	count )

Replace NODE layers while preserving compatible treatment and flow settings.

Requires BUILDING/OPENED and NODE type. Validates stack and existing anchor bounds. Existing Richards/retention configuration requires same layer count/kinds; treatment-bearing layers must retain their kind. Refusal preserves the authored stack. Success synchronizes dependent node MaxDepths/outlet offsets.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.
[in]	rows	Non-null copied array of count layers; unused parameters must be zero.
[in]	count	Positive authored layer count, including optional final BOTTOM. SURFACE may occur only first; at least one MEDIA/AGGREGATE is required.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments. SWMM_ERR_LIFECYCLE outside BUILDING/OPENED.

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◆ swmm_lid_node_outlet_get()

SWMM_ENGINE_API int swmm_lid_node_outlet_get	(	SWMM_Engine	engine,
		int	link,
		int *	layer,
		int *	top )

Read a link's LID layer anchor.

No lifecycle check.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	link	Zero-based existing link index.
[out]	layer	Non-null output; zero when no anchor exists.
[out]	top	Non-null output: 0=BOTTOM, 1=TOP; zero when absent.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

◆ swmm_lid_node_outlet_set()

SWMM_ENGINE_API int swmm_lid_node_outlet_set	(	SWMM_Engine	engine,
		int	link,
		int	layer,
		int	top )

Set or remove a link's LID layer anchor.

Requires BUILDING/OPENED. Nonzero layer requires exactly one LID endpoint and a valid layer index. Replaces any previous anchor, then synchronizes offsets; removal needs no LID endpoint.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	link	Zero-based existing link index.
[in]	layer	Zero removes the anchor; otherwise one-based physical layer, top-to-bottom excluding BOTTOM.
[in]	top	0=BOTTOM or 1=TOP, required even when removing.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments. SWMM_ERR_LIFECYCLE outside BUILDING/OPENED.

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◆ swmm_lid_node_state_count()

SWMM_ENGINE_API int swmm_lid_node_state_count	(	SWMM_Engine	engine,
		int	node )

Count initialized runtime profile cells.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.

Returns: Nonnegative row count; -1 for null engine or invalid selected node/control. Runtime state count is zero for nonstorage/plain storage and before initialization.

◆ swmm_lid_node_state_get()

SWMM_ENGINE_API int swmm_lid_node_state_get	(	SWMM_Engine	engine,
		int	node,
		int	row,
		int *	layer,
		double *	bottom,
		double *	top,
		double *	moisture )

Read one initialized LID profile cell.

Runtime rows are top-to-bottom; porous layers may produce several cells. No lifecycle check, but node must be storage with an existing runtime row.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[in]	row	Zero-based row index in the selected profile/table.
[out]	layer	Non-null one-based physical layer identifier.
[out]	bottom	Non-null cell-bottom depth above node invert, ft/m.
[out]	top	Non-null cell-top depth above node invert, ft/m.
[out]	moisture	Non-null volumetric water fraction; Richards porous rows use theta, classical rows include mobile-head inundation.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

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◆ swmm_lid_node_treatment_count()

SWMM_ENGINE_API int swmm_lid_node_treatment_count	(	SWMM_Engine	engine,
		int	control )

Count per-layer treatment rows flattened top-to-bottom.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.

Returns: Nonnegative row count; -1 for null engine or invalid control.

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◆ swmm_lid_node_treatment_get()

SWMM_ENGINE_API int swmm_lid_node_treatment_get	(	SWMM_Engine	engine,
		int	control,
		int	row,
		SWMM_LidLayerTreatment *	out )

Read a flattened per-layer treatment row.

Reads explicitly authored node_layers storage; a control lacking that storage can return BADINDEX. removal_percent is 0..100; decay_per_day is per day.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.
[in]	row	Zero-based flattened treatment index; negative/out-of-range rows return BADPARAM.
[out]	out	Non-null struct. expression borrows engine storage; do not free and copy before editing/destroying the control/engine. layer is one-based and pollutant is an engine pollutant index.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

◆ swmm_lid_richards_material_get()

SWMM_ENGINE_API int swmm_lid_richards_material_get	(	SWMM_Engine	engine,
		int	control,
		int	row,
		SWMM_LidRichardsMaterial *	out )

Read a control's Richards material.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.
[in]	row	Zero-based row index in the selected profile/table.
[out]	out	Non-null caller-owned output. alpha/specific_storage are inverse metres in both project unit systems; nonporous rows may contain unused defaults.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

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◆ swmm_lid_richards_options_get()

SWMM_ENGINE_API int swmm_lid_richards_options_get	(	SWMM_Engine	engine,
		int	control,
		SWMM_LidRichardsOptions *	out )

Read a control's Richards options.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	control	Zero-based existing LID control index.
[out]	out	Non-null caller-owned output. Defaults are returned for an empty stack; model is 0 or 1.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

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◆ swmm_lid_richards_state_get()

SWMM_ENGINE_API int swmm_lid_richards_state_get	(	SWMM_Engine	engine,
		int	node,
		int	row,
		double *	pressure,
		double *	head,
		double *	water )

Read one Richards cell's pressure, total head and complete water volume.

Requires an initialized Richards storage profile; classical formulation returns BADPARAM. No state is advanced.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[in]	row	Zero-based row index in the selected profile/table.
[out]	pressure	Non-null pressure head in project length units, ft/m.
[out]	head	Non-null total hydraulic head in ft/m, including node invert and cell elevation.
[out]	water	Non-null complete cell water in project volume units, ft3/m3; surface row uses node volume.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

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◆ swmm_lid_richards_statistics_get()

SWMM_ENGINE_API int swmm_lid_richards_statistics_get	(	SWMM_Engine	engine,
		int	node,
		SWMM_LidRichardsStatistics *	out )

Read the last stored Richards adaptive-solver report.

Returns BADPARAM unless the node uses Richards; does not advance/reset statistics.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[out]	out	Non-null caller-owned statistics: accepted/rejected steps, RHS evaluations, Newton iterations, min_step in seconds and balance_m3 in SI cubic metres.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

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◆ swmm_node_get_lid()

SWMM_ENGINE_API int swmm_node_get_lid	(	SWMM_Engine	engine,
		int	node,
		int *	control,
		double *	saturation )

Read a node LID-control assignment and initial saturation.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[out]	control	Non-null control-index output; -1 for nonstorage/plain storage.
[out]	saturation	Non-null initial saturation output in percent; zero for nonstorage.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

◆ swmm_node_get_lid_bottom()

SWMM_ENGINE_API int swmm_node_get_lid_bottom	(	SWMM_Engine	engine,
		int	node,
		int *	mode )

Read a node's bottom exchange ownership mode.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[out]	mode	Non-null SWMM_LID_BOTTOM_* destination; CURRENT for nodes without a LID assignment.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments.

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◆ swmm_node_set_lid()

SWMM_ENGINE_API int swmm_node_set_lid	(	SWMM_Engine	engine,
		int	node,
		int	control,
		double	saturation )

Assign or clear a storage-node LID and synchronize its geometry.

Requires BUILDING/OPENED and storage node. Checks existing outlet anchors and refuses a second LID endpoint. Clears node runtime LID state and cached full volume. Assignment preserves bottom mode; clearing resets CURRENT and removes attached outlet anchors.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[in]	control	Existing control with a valid derived/authored stack, or -1 to clear the assignment.
[in]	saturation	Finite initial saturation in percent [0,100]; ignored/reset to zero when clearing.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments. SWMM_ERR_LIFECYCLE outside BUILDING/OPENED.

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◆ swmm_node_set_lid_bottom()

SWMM_ENGINE_API int swmm_node_set_lid_bottom	(	SWMM_Engine	engine,
		int	node,
		int	mode )

Select bottom ownership for one assigned storage LID.

Requires BUILDING/OPENED and an assigned storage LID. Authoring MESH_AQUIFER does not by itself establish a qualified executable mesh connection.

Parameters

[in]	engine	Non-null live engine; caller serializes access.
[in]	node	Zero-based existing node index.
[in]	mode	SWMM_LID_BOTTOM_CURRENT, SEALED or MESH_AQUIFER.

Returns: SWMM_OK; SWMM_ERR_BADHANDLE for null engine, SWMM_ERR_BADINDEX for a failed index check, or SWMM_ERR_BADPARAM for invalid required arguments. SWMM_ERR_LIFECYCLE outside BUILDING/OPENED.

Functions

Detailed Description

Function Documentation

◆ swmm_lid_node_base_area()

◆ swmm_lid_node_bottom_state_get()

◆ swmm_lid_node_configure()

◆ swmm_lid_node_configure_flow()

◆ swmm_lid_node_layer_count()

◆ swmm_lid_node_layer_get()

◆ swmm_lid_node_layers_set()

◆ swmm_lid_node_outlet_get()

◆ swmm_lid_node_outlet_set()

◆ swmm_lid_node_state_count()

◆ swmm_lid_node_state_get()

◆ swmm_lid_node_treatment_count()

◆ swmm_lid_node_treatment_get()

◆ swmm_lid_richards_material_get()

◆ swmm_lid_richards_options_get()

◆ swmm_lid_richards_state_get()

◆ swmm_lid_richards_statistics_get()

◆ swmm_node_get_lid()

◆ swmm_node_get_lid_bottom()

◆ swmm_node_set_lid()

◆ swmm_node_set_lid_bottom()