FA-68979 / Tide and marine navigation tables / Member archive

Bridge air draft clearance: Tides above MHWS are clipped to zero reduction · case 04

During a surge the bridge is reported with its full charted clearance.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Input [c, mhws, tide, air, safety]: charted vertical clearance c is measured above MHWS; mhws and tide are heights above chart datum; air is the vessel air draft. Available clearance = c+(mhws-tide) (it shrinks when the tide exceeds MHWS). Return [round(avail,2), round(avail-air,2), avail-air>=safety].

Why this case matters

Tide tables and passage plans turn published predictions into go/no-go decisions about depth, clearance and timing.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
bridge air draft clearance [9.0, 5.0, 6.0, 7.5, 0.4]	`[9.0, 1.5, true]`	`[8.0, 0.5, true]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.