--- a/artifacts/src/main/java/org/dive4elements/river/utils/RiverUtils.java	Mon Dec 16 15:14:40 2013 +0100
+++ b/artifacts/src/main/java/org/dive4elements/river/utils/RiverUtils.java	Mon Dec 16 16:00:10 2013 +0100
@@ -786,13 +786,31 @@
             return null;
         }
         else{
-            WQKms[] wqkms = (WQKms[]) flys.getWaterlevelData().
-                                              getData();
-            if (wqkms == null)
-            logger.warn("not  waterlevels in artifact");
-            else if (wqkms.length < idx)
-            logger.warn("not enough waterlevels in artifact");
-            return wqkms[idx];
+            Object data = flys.getWaterlevelData(context).getData();
+
+            if (data == null) {
+                logger.error("No waterlevel Data in artifact");
+                return null;
+            }
+
+            if (data instanceof WQKms[]) {
+                WQKms[] wqkms = (WQKms[]) data;
+                if (wqkms.length < idx) {
+                    logger.error("not enough waterlevels in artifact");
+                    return null;
+                }
+                return wqkms[idx];
+            } else if (data instanceof WKms[]) {
+                WKms[] wkms = (WKms[]) data;
+                if (wkms.length < idx) {
+                    logger.error("not enough wkms in artifact");
+                    return null;
+                }
+                return wkms[idx];
+            }
+
+            logger.error("unknown Waterlevel Data.");
+            return null;
         }
     }