Launder channel cover with independently openable panel members

A cover arrangement for a launder channel of a clarifier tank, said clarifier tank having a tank wall, a launder channel and a weir wall, said cover arrangement comprising:

• at least one mounting section attachable to the clarifier tank near the launder channel;
• and
• a plurality of cover panel members, each panel member having a horizontal planar surface and two perpendicular stiffening flanges located on opposing lateral edges of said surface extending downwardly at a substantially 90 degree angle, said stiffening flanges of said cover panel members forming a planar surfaces for facing opposing stiffening flanges on adjacent cover panel members in a substantially parallel manner, where each of said cover panel members further includes light seals, either one of attached to or attached near each of said stiffening flanges,
• wherein said cover arrangement includes arranging said plurality of cover panels around the clarifier tank over said launder channel such that said light seals attached to or near one of said planar surfaces facing opposing stiffening flanges of a said stiffening flanges of a first panel member among said plurality of panel members abuts against said light seals on said planar surfaces of stiffening flanges of an adjacent second panel member among said plurality of panel members.