Fluid containment device

A containment basin comprising:

• a plurality of interlocking modular panels forming a perimeter around a storage tank, wherein said each one of said modular panels includes:
• (i) a base section having an inside edge, an outside edge and two side edges;
• (ii) a side section having a top edge, a bottom edge and two side edges;
• wherein said base section and side section are molded together as a single unitary piece and fixedly connected to one another at said bottom edge of the side section and said outside edge of the base section;
• and
• a plurality of ribs molded thereinto, said ribs bridging said side section and said base section.

An interlocking modular panel for use in a containment basin comprising:

• a base section;
• a side section;
• wherein said base section and side section are molded together as a single unitary piece and are fixedly connected to one another at an edge;
• and
• said interlocking modular panel further includes a plurality of ribs molded thereinto, said ribs bridging said side section and said base section, where said side section has an inward inclination of at least 2 degrees from a perpendicular.