Above ground fluid storage system

A method for use in impounding or diverting a liquid comprising:

• transporting a plurality of supporting structures from a first location to a set up location, each supporting structure of said plurality of supporting structures comprising a leg member configured to support a liner and a support member connected to said leg member and configured to hold said leg member upright;
• releasably attaching an extension portion of at least one of said leg member and said support member to a remainder of said at least one of said leg member and said support member;
• and
• connecting the plurality of supporting structures to one another such that a base is surrounded by the plurality of supporting structures.

An above ground liquid impoundment or cofferdam system comprising:

• a substantially impermeable liner bounding an interior for receiving a liquid;
• a plurality of supporting structures supporting the liner and the liquid when the liquid is received in said interior;
• and
• a first supporting structure of said plurality of supporting structures comprising a leg member supporting said liner and a support member connected to said leg member and holding said leg member, at least one of said leg member and said support member comprising a releasably attachable extension portion to allow separation of said extension portion from a remainder of at least one of said leg member and said support member.