Gangway & Tide Geometry Simulator

Remaining Deck Margin

-- --

Horizontal Wheel Pullback (Δx)

-- Horizontal span x = -- ft

Instantaneous Ratio (dx / dy)

-- Ramp angle θ = --°

Cumulative Ratio (Δx / |y|)

-- Avg horizontal pullback per unit of tide

💡 Drag the deck ↕ for tide, ↔ for barge surge, or grab its outboard edge ↔ to resize. --

Saved Scenarios

Water Level (Tide) --

Still-water tide reading on the chart datum (drag deck ↕)

Ramp Length (L) --

Fixed hypotenuse of the gangway

Dock Hinge Height Above Mud --

Fixed elevation of the dock hinge above the bottom

Mud Level --

Tide reading where the bottom is reached — barge grounds at or below this

Floating Home Deck Length --

Length of the barge deck (drag its outboard edge ↔)

Landing Runway Margin (M) --

Deck distance from max reach (y = 0) to water's edge

Horizontal Barge Surge (S) --

Mooring play: + drifts off dock, − toward dock (1:1). Drag deck ↔

Step-by-Step Tidal Pullback Table for 12.0 ft Ramp

Vertical Offset \|y\|	Ramp Angle (θ)	Horizontal Span (x)	Cumulative Wheel Pullback (Δx)	Instantaneous Ratio (tan θ)	Cumulative Ratio (Δx / \|y\|)	Deck Margin Left