| CPC B65D 88/36 (2013.01) [A01G 33/00 (2013.01); B65D 90/022 (2013.01); B65D 90/42 (2013.01)] | 12 Claims |

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1. A multilayer panel for dams covering a part of a surface of liquid for reducing evaporation, wherein the multilayer panel comprises:
a biofilm layer (1) comprising microorganism, cultivated on a surface of the multilayer panel facing the liquid;
a nutrient layer (2) comprising nutrients for said microorganism, placed on the biofilm layer (1) such that it is positioned adjacent to the biofilm layer (1);
a support layer (4) placed on the nutrient layer (2); and
at least one floating support (6) carrying said layers in connection with the support layer (4), preventing these layers from contacting with the liquid and enabling the multilayer panel to float on the liquid by contacting the surface of the liquid.
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