--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/WaterlevelSelectState.java	Wed Apr 03 15:59:01 2013 +0200
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/states/WaterlevelSelectState.java	Wed Apr 03 16:00:21 2013 +0200
@@ -15,6 +15,7 @@
 import de.intevation.flys.artifacts.FLYSArtifact;
 import de.intevation.flys.artifacts.model.CalculationResult;
 import de.intevation.flys.artifacts.model.WQKms;
+import de.intevation.flys.artifacts.model.extreme.ExtremeResult;
 import de.intevation.flys.artifacts.resources.Resources;
 import de.intevation.flys.utils.FLYSUtils;
 import de.intevation.flys.utils.StringUtil;
@@ -123,7 +124,14 @@
             ComputeType.ADVANCE,
             false);
 
-        WQKms[] wqkms = (WQKms[]) rawData.getData();
+        WQKms[] wqkms;
+
+        if (rawData.getData() instanceof ExtremeResult) {
+            wqkms = ((ExtremeResult) rawData.getData()).getWQKms();
+        }
+        else {
+            wqkms = (WQKms[]) rawData.getData();
+        }
 
         int idx = -1;
         try {