Abstract: Methods for gathering and draining floating biomass comprising providing a tray for holding said biomass and fluid, where said tray comprises: (a) at least one drain orifice for draining at least a part of said floating biomass and at least a part of a top layer of said fluid; and (b) at least one inlet orifice for flowing said fluid into said tray for maintaining a surface flow height, for maintaining a surface fall operation of a fluid level in said tray while continuing said draining of a part of said floating biomass and of a part of said biomass through said at least one drain in said surface fall operation.

Abstract: Methods for gathering and draining floating biomass comprising providing a tray for holding said biomass and fluid, where said tray comprises: (a) at least one drain orifice for draining at least a part of said floating biomass and at least a part of a top layer of said fluid; and (b) at least one inlet orifice for flowing said fluid into said tray for maintaining a surface flow height, for maintaining a surface fall operation of a fluid level in said tray while continuing said draining of a part of said floating biomass and of a part of said biomass through said at least one drain in said surface fall operation.

Abstract: Methods for transferring floating biomass from a container, the method comprising: (a) providing a container for holding said biomass and fluid, wherein said container comprises at least two horizontally aligned orifices; (b) elevating a fluid level of said fluid in said container to a height of at least one of said horizontally aligned orifices; and (c) flowing a carrier fluid through at least one of said horizontally aligned orifices to stream at least a portion of a top layer of said floating biomass out of said container and through at least one other of said horizontally aligned orifices, thereby transferring at least one layer portion of said floating biomass from said container out of said container.