UnitConversion.hpp

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#ifndef OPENSWMM_UNIT_CONVERSION_HPP
#define OPENSWMM_UNIT_CONVERSION_HPP
 
namespace openswmm {
 
struct SimulationOptions;
 
namespace ucf {
 
// ============================================================================
// Quantity codes — matching legacy enums.h
// ============================================================================
 
enum Quantity {
    RAINFALL   = 0,   
    RAINDEPTH  = 1,   
    EVAPRATE   = 2,   
    LENGTH     = 3,   
    LANDAREA   = 4,   
    VOLUME     = 5,   
    WINDSPEED  = 6,   
    TEMPERATURE= 7,   
    MASS       = 8,   
    GWFLOW     = 9,   
    FLOW       = 10   
};
 
// ============================================================================
// Conversion factor tables — identical to legacy Ucf[10][2] and Qcf[6]
// ============================================================================
 
static constexpr double Ucf[10][2] = {
    //  US           SI
    {43200.0,    1097280.0 },   // RAINFALL: in/hr, mm/hr → ft/sec
    {12.0,       304.8     },   // RAINDEPTH: in, mm → ft
    {1036800.0,  26334720.0},   // EVAPRATE: in/day, mm/day → ft/sec
    {1.0,        0.3048    },   // LENGTH: ft, m → ft
    {2.2956e-5,  0.92903e-5},   // LANDAREA: ac, ha → ft²
    {1.0,        0.02832   },   // VOLUME: ft³, m³ → ft³
    {1.0,        1.608     },   // WINDSPEED: mph, km/hr → mph
    {1.0,        1.8       },   // TEMPERATURE: °F, °C → °F
    {2.203e-6,   1.0e-6    },   // MASS: lb, kg → mg
    {43560.0,    3048.0    }    // GWFLOW: cfs/ac, cms/ha → ft/sec
};
 
static constexpr double Qcf[6] = {
    1.0,       // CFS → cfs
    448.831,   // GPM → cfs
    0.64632,   // MGD → cfs
    0.02832,   // CMS → cfs
    28.317,    // LPS → cfs
    2.4466     // MLD → cfs
};
 
// ============================================================================
// Convenience constants — common fixed conversions not unit-system dependent
// ============================================================================
 
static constexpr double ACRES_TO_FT2 = 43560.0;     
static constexpr double FT3_TO_MGAL  = 7.48052e-6;  
static constexpr double SEC_PER_DAY  = 86400.0;     
 
// ============================================================================
// UCF function — matching legacy UCF()
// ============================================================================
 
double UCF(int quantity, const SimulationOptions& opts);
 
int getUnitSystem(int flow_units);
 
} // namespace ucf
} // namespace openswmm
 
#endif // OPENSWMM_UNIT_CONVERSION_HPP