Stationary Docks are common for permanent docks, applications that rule out rolling docks, and on bodies of water generally ranging from shallow (0-5ft deep) to deep (5-7ft deep). Stationary docks are also preferred for some rivers, tidal waters, and reservoirs.
Rolling Docks are very convenient when the dock is a seasonal structure or when mobility is required. They are complete generally best for lakes with shallow water (0-5ft deep) to deep water (5-8ft deep) with a gradual access point.
Floating Docks are best for applications with fluctuating waters like reservoirs, tidal waters, canals, and rivers. Also, floating docks are optimal when water depths are very deep (8ft+ deep) or when the soil type is extremely muddy.