Offensive odours are the major cause of complaints from swine facilities. The odour released from conventional earten storage basins is related to the surface area exposed to the environment. Currently, options to cover these basins to reduce the exposed surface area are limited to straw, plastic or synethic covers. Straw covers are very popular due to their low cost, however straw must be replced annually, allow precipitation into the basin, and create problems during pump out. Synethic floating covers and low-profile air supported covers are expensive and may be damaged in high winds.