Tightening Dutch regulations regarding the application of animal slurry has been increasing in recent years. Land application is no longer allowed during winter months and sealed slurry storage containers must be utilized for any production units built after 1987. Due to a limited land base, slurry can be transported 50-250 km from the site of production which is very costly. One recent design looking at ways to reduce slurry accumulation, and subsequent transportation and land application, examined evaporation of water from the slurry. Designed in such a manner as not to increase the amount of ammonia emissions generated through the evaporation process. A transparent cover was placed over a slurry storage unit (1m maximum depth) with the condensate being collected in storage containers outside the sluury storage unit. The transparent cover was effective in reducing the total slurry volume, however the amount removed (water evaporized) will be dependant on sun radiation, outside temoperature and windspeed. Manure application and transportation costs can be effectively decreased by Dfi 3.90 per m2 of storage capacity or Dfi 4.90 per fattening pig.