--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentDensity.java	Tue Oct 22 15:51:33 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/SedimentDensity.java	Tue Oct 22 16:24:08 2013 +0200
@@ -16,11 +16,13 @@
 import java.util.Set;
 import java.util.TreeMap;
 
+import java.io.Serializable;
+
 import org.apache.log4j.Logger;
 
 
 /** Sediment Densities for multiple years. */
-public class SedimentDensity
+public class SedimentDensity implements Serializable
 {
     private static final Logger logger = Logger
         .getLogger(SedimentDensity.class);