Cassette

A shallow waterway turbine system comprising:

• a rectangular base constructed of a cement mixture defining an obround depression, wherein:
• the rectangular base comprises an embedded mortise insert;
• the mortise insert comprises a metal spine and a plurality of support ribs for securing the mortise insert within the base;
• the mortise insert further comprises one or more sockets;
• and
• the obround depression comprises one or more circular cavities exposing one or more sockets of the mortise insert;
• and
• a base plate, wherein:
• the base plate is manufactured of a metal and includes knobs for being accepted by the one or more sockets;
• the base plate is operatively connected to one or more turbine rotors;
• and
• a perimeter of the base plate is contained completely within the obround depression.

A shallow waterway turbine system comprising:

• a rectangular base constructed of a cement mixture comprising:
• an obround depression comprising one or more circular cavities for exposing one or more sockets of an embedded mortise insert;
• and
• the embedded mortise insert comprising:
• a metal spine and a plurality of support ribs for securing the mortise insert within the base;
• and
• the one or more sockets;
• and
• a base plate, wherein:
• the base plate is manufactured of a metal and includes knobs for interfacing with the one or more sockets;
• the base plate is contained completely within the obround depression;
• and
• the obround depression completely circumscribes the base plate;
• a top frame constructed of metal or metal alloy and parallel to the base;
• a pair of convex sidewalls constructed of non-metal material connected to the top frame via one or more metal brackets and to the base, wherein:
• the base, top frame, and pair of convex sidewalls form a module comprising a central volume;
• and
• a midpoint of each of the pair of convex sidewalls extends into the central volume of the module;
• and
• two turbines connected to:
• a) the base via the base plate and mortise insert;
• and b) the top frame, and extending through the central volume.