transect.c File Reference

Irregular channel transect geometry and hydraulic tables. More...

#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "headers.h"

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Macros
#define	_CRT_SECURE_NO_DEPRECATE
#define	MAXSTATION   1500

Functions
int	transect_create (int n)
	Creates an array of cross-section transects.
void	transect_delete (void)
	Deletes memory allocated for all transects.
int	transect_readParams (int *count, char *tok[], int ntoks)
	Parse an NC, X1 or GR transect input record.
void	transect_validate (int j)
	Validates transect data and creates its geometry tables.
void	transect_createStreetTransect (TStreet *street)
	Construct hydraulic geometry tables from a one- or two-sided street section.

Detailed Description

Irregular channel transect geometry and hydraulic tables.

Author

Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com (OpenSWMM maintenance and extensions)

Copyright

Copyright (c) 2026 Caleb Buahin. OpenSWMM contributions only; original EPA SWMM credits are retained.

License

Apache-2.0 for OpenSWMM contributions; original EPA SWMM provenance is retained.

Macro Definition Documentation

_CRT_SECURE_NO_DEPRECATE

#define _CRT_SECURE_NO_DEPRECATE

MAXSTATION

#define MAXSTATION   1500

Function Documentation

transect_create()

int transect_create

(

int

n

)

Creates an array of cross-section transects.

Parameters

[in]

n

Number of transect objects to create.

Returns

An error code.

transect_createStreetTransect()

void transect_createStreetTransect

(

TStreet *

street

)

Construct hydraulic geometry tables from a one- or two-sided street section.

Parameters

[in,out]

street

Non-null borrowed street with validated internal-feet geometry, dimensionless slopes and Manning coefficients. Its transect tables and transect roughness are overwritten.

Postcondition

Reuses shared Station/Elev/Nstations and roughness/bank positions, then calls createTables() over the computed elevation range.

Note

No allocation or geometry status is returned; caller retains the street.

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transect_delete()

void transect_delete

(

void

)

Deletes memory allocated for all transects.

transect_readParams()

int transect_readParams	(	int *	count,
		char *	tok[],
		int	ntoks )

Parse an NC, X1 or GR transect input record.

Parameters

[in,out]	count	Non-null next-transect index; X1 increments it before assigning new parameters. NC validates the previous transect.
[in]	tok	Borrowed ntoks token strings; tok[0] must exist and select a supported record keyword. NC provides Manning values, X1 metadata and scaling, GR elevation/station pairs in authored length units.
[in]	ntoks	Available token count, at least one; record-specific minimums and pair completeness are checked.

Returns

Zero on success or an input/geometry error code. Global transect state or count may already have changed before an error return.

Note

The active transect and station arrays are module-level state; record order must follow the normal HEC-2-style input sequence.

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transect_validate()

void transect_validate

(

int

j

)

Validates transect data and creates its geometry tables.

Parameters

[in]

j

Transect index.

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