Compute the lake outflow coefficient (τ_lake) from measured outlet geometry — width W, slope S, Manning n, lake area A_lake — via the wide-channel Manning relation, so it is derived, not calibrated:
1/τ_lake ≈ 864 · W·√S / (n · A_lake)
Above the sill, H_eff is a real water-layer thickness, so the storage→stage factor collapses to 1 and the outlet coefficient becomes pure outlet hydraulics. Full derivation: the storage↔stage section of DESIGN_lakes.md. Related to #33 (both terrain-derived lake parameters).
🤖 Generated with Claude Code
Compute the lake outflow coefficient (
τ_lake) from measured outlet geometry — widthW, slopeS, Manningn, lake areaA_lake— via the wide-channel Manning relation, so it is derived, not calibrated:1/τ_lake ≈ 864 · W·√S / (n · A_lake)Above the sill,
H_effis a real water-layer thickness, so the storage→stage factor collapses to 1 and the outlet coefficient becomes pure outlet hydraulics. Full derivation: the storage↔stage section ofDESIGN_lakes.md. Related to #33 (both terrain-derived lake parameters).🤖 Generated with Claude Code