TunedDefaults.cs

using CatchmentTool2;

namespace CatchmentTool.Services
{
    /// <summary>
    /// Tuned algorithm parameters baked in from offline tuning runs (random
    /// sampling × multi-seed × 17 fixtures, composite v2 grading). These are
    /// the production values; the in-Civil-3D dialog does not expose them.
    /// To re-tune: run tools/CatchmentTool2.Tuner against new fixtures and
    /// update these constants.
    /// </summary>
    public static class TunedDefaults
    {
        public static readonly TuningParameters V2 = new TuningParameters
        {
            // Phase 1 — boundary
            BoundarySource             = BoundarySource.StructureBufferHull,
            StructureBufferDistance    = 50.0,
            // Phase 2 — raster: 1 ft cell locked, urban-hydrology resolution
            CellSize                   = 1.0,
            // Phase 3 — conditioning
            InletSnapRadiusCells       = 90.53,
            InletSnapDepth             = 0.55,
            DepressionHandling         = DepressionHandling.Breach,
            MaxBreachDepth             = 3.78,
            PondCaptureRadiusCells     = 42.37,
            PipeBurnDepth              = 3.48,
            // Phase 4 — routing
            RoutingAlgorithm           = RoutingAlgorithm.D8,
            MinSlopeThreshold          = 0.0,
            // Phase 5 — fallback
            FallbackMetric             = FallbackMetric.DownhillWeighted,
            DownhillBiasWeight         = 2.44,
            DownhillBiasLengthScale    = 100.0,
            MinCatchmentArea           = 105.52,
            // Phase 7 — smoothing (note: Phase7 also forces 2 Chaikin iterations
            // unconditionally for plan presentability, even when this is 0).
            RdpToleranceCellMultiplier = 2.63,
            ChaikinIterations          = 0,
            MaxAreaDriftPercent        = 2.0,
        };
    }
}