consts.h File Reference

Header file for SWMM constants. More...

#include "legacy_version.h"

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Macros
#define	VERSION   PROJECT_VERSION_SWMM_FORMAT
	SWMM version number.
#define	MAGICNUMBER   516114522
	Magic number used to identify a SWMM binary file.
#define	EOFMARK   0x1A
	End of file mark used in SWMM binary files.
#define	MAXTITLE   3
	Maximum number of title lines.
#define	MAXMSG   1024
	Maximum number of characters in a message.
#define	MAXLINE   1024
	Maximum number of characters per input line.
#define	MAXFNAME   259
	Maximum number of characters in a file name.
#define	MAXTOKS   40
	Maximum number of items per line of input.
#define	MAXSTATES   10
	Maximum number of computed hydraulic variables.
#define	MAXODES   4
	Maximum number of ODE's to be solved.
#define	NA   -1
	NOT APPLICABLE code.
#define	TRUE   1
	Value for TRUE state.
#define	FALSE   0
	Value for FALSE state.
#define	BIG   1.E10
	Generic large value.
#define	TINY   1.E-6
	Generic small value.
#define	ZERO   1.E-10
	Effective zero value.
#define	MISSING   -1.E10
	Missing value code.
#define	PI   3.141592654
	Value of pi.
#define	GRAVITY   32.2
	Acceleration of gravity in US units.
#define	SI_GRAVITY   9.81
	Acceleration of gravity in SI units.
#define	MAXHOTSTARTFILES   10
	Maximum number of hotstart files.
#define	MAXTIMESERIESCACHESIZE   10
	Maximum number of time series rows that can be cached to memory to speed up simulation.
#define	PHI   1.486
	Units factor in Manning Equation.
#define	MIN_RUNOFF_FLOW   0.001
	Minimum runoff flow (cfs)
#define	MIN_EXCESS_DEPTH   0.0001
	Minimum excess depth (ft) = 0.03 mm.
#define	MIN_TOTAL_DEPTH   0.004167
	Minimum total depth (ft). = 0.05 inches.
#define	MIN_RUNOFF   2.31481e-8
	Minimum runoff (ft/sec) = 0.001 in/hr.
#define	FLOW_TOL   0.00001
	Flow tolerance (cfs)
#define	DEPTH_TOL   0.00001
	Depth tolerance (ft)
#define	VOLUME_TOL   0.01
	Volume tolerance (ft3)
#define	FUDGE   0.0001
	Fudge factor (ft or ft2)
#define	GPMperCFS   448.831
	Gallons per minute per cfs.
#define	AFDperCFS   1.9837
	Acre-feet per day per cfs.
#define	MGDperCFS   0.64632
	Million gallons per day per cfs.
#define	IMGDperCFS   0.5382
	Imperial million gallons per day per cfs.
#define	LPSperCFS   28.317
	Liters per second per cfs.
#define	LPMperCFS   1699.0
	Liters per minute per cfs.
#define	CMHperCFS   101.94
	Cubic meters per hour per cfs.
#define	CMDperCFS   2446.6
	Cubic meters per day per cfs.
#define	MLDperCFS   2.4466
	Million liters per day per cfs.
#define	M3perFT3   0.028317
	Cubic meters per ft3.
#define	LperFT3   28.317
	Liters per ft3.
#define	MperFT   0.3048
	Meters per ft.
#define	PSIperFT   0.4333
	Pounds per square inch per ft.
#define	KPAperPSI   6.895
	Kilopascals per psi.
#define	KWperHP   0.7457
	Kilowatts per horsepower.
#define	SECperDAY   86400
	Seconds per day.
#define	MSECperDAY   8.64e7
	Milliseconds per day.
#define	MMperINCH   25.40
	Millimeters per inch.
#define	SEPSTR   " \t\n\r"
	Separator string.
#define	TBLSEPSTR   " \t\n\r,"
	Table separator characters.

Detailed Description

Header file for SWMM constants.

Author

L. Rossman

Date

Created: 2023-07-15

Last updated: 2024-12-30

Version

5.3.0

Various constants used in the SWMM model.

Update history

• Build 5.3.0 (2024-12-30)
  • Added MAXHOTSTARTFILES constant to support saving multiple hotstart files at different times.

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.