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//! Physical constants, unit-conversion factors and solver tolerances.
/// Tolerance for zero flow
pub const Q_ZERO: f64 = 1e-6;
/// Small value for small numbers
pub const SMALL_VALUE: f64 = 1e-6;
/// Smoothing epsilon for EPANET 3–style check-valve barrier head (ft).
/// Matches `HEAD_EPSILON` in EPANET 3 [`Core/constants.h`](https://github.com/OpenWaterAnalytics/epanet-dev/blob/develop/src/Core/constants.h).
pub const CV_HEAD_EPSILON: f64 = 1e-6;
/// Big value for large numbers
pub const BIG_VALUE: f64 = 1e8;
/// Tiny value for very small numbers
pub const TINY: f64 = 1e-6;
/// Minimum difference for Pressure Driven Analysis (PDA)
pub const PDA_MIN_DIFF: f64 = 0.1;
/// Viscosity of water
pub const VISCOSITY: f64 = 1.1e-5;
// PI (3.14159)
pub const PI: f64 = PI;
// Tolerance for head loss gradient
pub const RQ_TOL: f64 = 1e-7;
// Tolerance for flow difference
pub const Q_TOL: f64 = 0.0001;
/// Tolerance for head difference
pub const H_TOL: f64 = 0.0005;
/// Tolerance for level difference
pub const L_TOL: f64 = 0.0001;
/// Gallons per minute per cubic feet per second
pub const GPMperCFS: f64 = 448.831;
/// Million gallons per day per cubic feet per second
pub const MGDperCFS: f64 = 0.64632;
/// Imperial million gallons per day per cubic feet per second
pub const IMGDperCFS: f64 = 0.5382;
/// Acre-feet per day per cubic feet per second
pub const AFDperCFS: f64 = 1.9837;
/// Liters per second per cubic feet per second
pub const LPSperCFS: f64 = 28.317;
/// Liters per minute per cubic feet per second
pub const LPMperCFS: f64 = 1699.0;
/// Cubic meters per second per cubic feet per second
pub const CMSperCFS: f64 = 0.028317;
/// Cubic meters per hour per cubic feet per second
pub const CMHperCFS: f64 = 101.94;
/// Cubic meters per day per cubic feet per second
pub const CMDperCFS: f64 = 2446.6;
/// Million liters per day per cubic feet per second
pub const MLDperCFS: f64 = 2.4466;
// Conversion factors for SI quantities
/// Cubic meters per cubic feet per second
pub const M3perFT3: f64 = 0.028317;
/// Meters per feet
pub const MperFT: f64 = 0.3048;
/// Kilowatts per horsepower
pub const KWperHP: f64 = 0.7457;
// Conversion factors for pressure units
/// Bar per feet
pub const BARperFT: f64 = 0.02953;
/// Kilopascals per feet
pub const KPAperFT: f64 = 2.988;
/// Pounds per square inch per feet
pub const PSIperFT: f64 = 0.4333;