Namespaces
namespace	ode

Variables
constexpr double	GRAVITY = 32.2

constexpr double	SQRT_GRAVITY = 5.67450438786
	sqrt(GRAVITY) — precomputed to avoid per-element std::sqrt in Froude calc.

constexpr double	INV_SQRT_GRAVITY = 0.17622692584
	1.0 / sqrt(GRAVITY) — multiply instead of divide in Froude computation.

constexpr double	PI = 3.141592654
	Pi.

constexpr double	PHI = 1.486

constexpr double	MEXP = 5.0 / 3.0

constexpr double	VISCOS = 1.1e-5
	Kinematic viscosity of water at 20°C (ft²/sec).

constexpr double	SEC_PER_DAY = 86400.0
	Seconds per day.

constexpr double	FT_PER_IN = 1.0 / 12.0
	Feet per inch.

constexpr double	IN_PER_FT = 12.0
	Inches per foot.

constexpr double	FUDGE = 0.0001

constexpr double	MIN_SURFAREA = 12.566

constexpr double	MIN_DELTA_Z = 0.001
	Minimum elevation drop for conduit slope computation (ft).

constexpr double	XTOL = 0.001

constexpr double	TINY = 1.0e-6
	Small positive number for underflow protection.

constexpr double	OMEGA = 0.5

constexpr double	DEFAULT_HEAD_TOL = 0.005

constexpr int	DEFAULT_MAX_TRIALS = 8

constexpr double	MAX_VELOCITY = 50.0

constexpr double	MIN_TIMESTEP = 0.001

constexpr double	EXTRAN_CROWN_CUTOFF = 0.96

constexpr double	SLOT_CROWN_CUTOFF = 0.985257
	Preissmann slot crown cutoff fraction.

constexpr double	SLOT_WIDTH_FACTOR = 0.001
	Preissmann slot width factor (slot_width = y_full * this factor).

constexpr double	MIN_LINK_FLOW = 0.001
	Minimum orifice/weir flow threshold.

constexpr double	RECT_ALFMAX = 0.97
	Maximum alpha fraction for rectangular shapes.

constexpr double	TRAP_ALFMAX = 0.98
	Maximum alpha fraction for trapezoidal shapes.

constexpr int	N_TRANSECT_TBL = 51
	Transect discretization table size.

constexpr int	MAX_SHAPES = 26
	Maximum number of cross-section shape types.

constexpr int	N_FLOW_CLASSES = 7
	Number of flow classification bins.

constexpr int	MAX_PAST_RAIN = 48
	Maximum past rain hours tracked per gage.

constexpr int	N_TIME_BINS = 5
	Number of time step histogram bins.

constexpr int	DATE_DELTA = 693594

Variable Documentation

◆ DATE_DELTA

constexpr int openswmm::constants::DATE_DELTA = 693594

constexpr

Delphi-style date offset used by legacy datetime encoding.

See also: Legacy: DateDelta in datetime.c Needed for day-of-week computation: (floor(date) + DATE_DELTA) % 7 gives 0=Sat with +1 → 1=Sun..7=Sat matching legacy datetime_dayOfWeek().

◆ DEFAULT_HEAD_TOL

constexpr double openswmm::constants::DEFAULT_HEAD_TOL = 0.005

constexpr

Default convergence tolerance for node depth change (ft).

See also: Legacy: HeadTol in globals.h

◆ DEFAULT_MAX_TRIALS

constexpr int openswmm::constants::DEFAULT_MAX_TRIALS = 8

constexpr

Default maximum Picard iterations per routing step.

See also: Legacy: MaxTrials in globals.h

◆ EXTRAN_CROWN_CUTOFF

constexpr double openswmm::constants::EXTRAN_CROWN_CUTOFF = 0.96

constexpr

EXTRAN surcharge crown cutoff fraction (depth/full_depth). Above this, the Preissmann slot or surcharge algorithm activates.

◆ FT_PER_IN

constexpr double openswmm::constants::FT_PER_IN = 1.0 / 12.0

constexpr

Feet per inch.

◆ FUDGE

constexpr double openswmm::constants::FUDGE = 0.0001

constexpr

Minimum depth/area/flow threshold (ft or ft²). Values below this are treated as zero for numerical stability.

See also: Legacy: FUDGE in dynwave.c

◆ GRAVITY

constexpr double openswmm::constants::GRAVITY = 32.2

constexpr

Gravitational acceleration (ft/s²).

See also: Legacy: GRAVITY in consts.h

◆ IN_PER_FT

constexpr double openswmm::constants::IN_PER_FT = 12.0

constexpr

Inches per foot.

◆ INV_SQRT_GRAVITY

constexpr double openswmm::constants::INV_SQRT_GRAVITY = 0.17622692584

constexpr

1.0 / sqrt(GRAVITY) — multiply instead of divide in Froude computation.

◆ MAX_PAST_RAIN

constexpr int openswmm::constants::MAX_PAST_RAIN = 48

constexpr

Maximum past rain hours tracked per gage.

◆ MAX_SHAPES

constexpr int openswmm::constants::MAX_SHAPES = 26

constexpr

Maximum number of cross-section shape types.

◆ MAX_VELOCITY

constexpr double openswmm::constants::MAX_VELOCITY = 50.0

constexpr

Maximum conduit velocity (ft/s) — prevents numerical blowup.

See also: Legacy: MAXVELOCITY in dynwave.c

◆ MEXP

constexpr double openswmm::constants::MEXP = 5.0 / 3.0

constexpr

Manning's overland flow exponent (5/3).

See also: Legacy: MEXP in consts.h

◆ MIN_DELTA_Z

constexpr double openswmm::constants::MIN_DELTA_Z = 0.001

constexpr

Minimum elevation drop for conduit slope computation (ft).

◆ MIN_LINK_FLOW

constexpr double openswmm::constants::MIN_LINK_FLOW = 0.001

constexpr

Minimum orifice/weir flow threshold.

◆ MIN_SURFAREA

constexpr double openswmm::constants::MIN_SURFAREA = 12.566

constexpr

Default minimum surface area (ft²) — approximately a 4-ft diameter manhole.

See also: Legacy: MIN_SURFAREA in consts.h

◆ MIN_TIMESTEP

constexpr double openswmm::constants::MIN_TIMESTEP = 0.001

constexpr

Absolute minimum routing timestep (s).

See also: Legacy: MINTIMESTEP in dynwave.c

◆ N_FLOW_CLASSES

constexpr int openswmm::constants::N_FLOW_CLASSES = 7

constexpr

Number of flow classification bins.

◆ N_TIME_BINS

constexpr int openswmm::constants::N_TIME_BINS = 5

constexpr

Number of time step histogram bins.

◆ N_TRANSECT_TBL

constexpr int openswmm::constants::N_TRANSECT_TBL = 51

constexpr

Transect discretization table size.

◆ OMEGA

constexpr double openswmm::constants::OMEGA = 0.5

constexpr

Picard iteration under-relaxation factor.

See also: Legacy: OMEGA in dynwave.c

◆ PHI

constexpr double openswmm::constants::PHI = 1.486

constexpr

Manning's equation US customary unit factor (1.486). Q = (PHI/n) * A * R^(2/3) * S^(1/2) where PHI = 1.486 for US, 1.0 for SI.

See also: Legacy: PHI in consts.h

◆ PI

constexpr double openswmm::constants::PI = 3.141592654

constexpr

Pi.

◆ RECT_ALFMAX

constexpr double openswmm::constants::RECT_ALFMAX = 0.97

constexpr

Maximum alpha fraction for rectangular shapes.

◆ SEC_PER_DAY

constexpr double openswmm::constants::SEC_PER_DAY = 86400.0

constexpr

Seconds per day.

◆ SLOT_CROWN_CUTOFF

constexpr double openswmm::constants::SLOT_CROWN_CUTOFF = 0.985257

constexpr

Preissmann slot crown cutoff fraction.

◆ SLOT_WIDTH_FACTOR

constexpr double openswmm::constants::SLOT_WIDTH_FACTOR = 0.001

constexpr

Preissmann slot width factor (slot_width = y_full * this factor).

◆ SQRT_GRAVITY

constexpr double openswmm::constants::SQRT_GRAVITY = 5.67450438786

constexpr

sqrt(GRAVITY) — precomputed to avoid per-element std::sqrt in Froude calc.

◆ TINY

constexpr double openswmm::constants::TINY = 1.0e-6

constexpr

Small positive number for underflow protection.

◆ TRAP_ALFMAX

constexpr double openswmm::constants::TRAP_ALFMAX = 0.98

constexpr

Maximum alpha fraction for trapezoidal shapes.

◆ VISCOS

constexpr double openswmm::constants::VISCOS = 1.1e-5

constexpr

Kinematic viscosity of water at 20°C (ft²/sec).

◆ XTOL

constexpr double openswmm::constants::XTOL = 0.001

constexpr

Tolerance for bounding state variables.

See also: Legacy: XTOL in gwater.c

Namespaces

Variables

Variable Documentation

◆ DATE_DELTA

◆ DEFAULT_HEAD_TOL

◆ DEFAULT_MAX_TRIALS

◆ EXTRAN_CROWN_CUTOFF

◆ FT_PER_IN

◆ FUDGE

◆ GRAVITY

◆ IN_PER_FT

◆ INV_SQRT_GRAVITY

◆ MAX_PAST_RAIN

◆ MAX_SHAPES

◆ MAX_VELOCITY

◆ MEXP

◆ MIN_DELTA_Z

◆ MIN_LINK_FLOW

◆ MIN_SURFAREA

◆ MIN_TIMESTEP

◆ N_FLOW_CLASSES

◆ N_TIME_BINS

◆ N_TRANSECT_TBL

◆ OMEGA

◆ PHI

◆ PI

◆ RECT_ALFMAX

◆ SEC_PER_DAY

◆ SLOT_CROWN_CUTOFF

◆ SLOT_WIDTH_FACTOR

◆ SQRT_GRAVITY

◆ TINY

◆ TRAP_ALFMAX

◆ VISCOS

◆ XTOL