--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/Calculation4.java	Sun Jan 13 14:18:04 2013 +0100
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/Calculation4.java	Sun Jan 13 16:18:28 2013 +0100
@@ -11,6 +11,7 @@
 
 import de.intevation.flys.utils.DoubleUtil;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
@@ -228,9 +229,63 @@
             results[i].setName(createName(i));
         }
 
+        // Generate the "Umhuellende".
+        results = generateInfolding(table, results, from, to, step);
+
         return new CalculationResult(results, this);
     }
 
+    protected WQKms [] generateInfolding(
+        WstValueTable wst,
+        WQKms []      results,
+        double        from,
+        double        to,
+        double        step
+    ) {
+        WstValueTable.Column [] columns = wst.getColumns();
+
+        InfoldingColumns ic = new InfoldingColumns(columns);
+        ic.markInfoldingColumns(results);
+
+        List<WQKms> infoldings = new ArrayList<WQKms>();
+
+        boolean [] infoldingColumns = ic.getInfoldingColumns();
+        for (int i = 0; i < infoldingColumns.length; ++i) {
+            if (infoldingColumns[i]) {
+                continue;
+            }
+            double q = columns[i].getQRangeTree().findQ(from);
+            if (Double.isNaN(q)) {
+                addProblem(from, "cannot.find.q");
+                continue;
+            }
+            double [] kms = DoubleUtil.explode(from, to, step);
+            double [] oqs = new double[kms.length];
+            double [] ows = new double[kms.length];
+            boolean success =
+                wst.interpolate(q, from, kms, ows, oqs, this) != null;
+
+            if (success) {
+                // TODO: generate a better name. I18N.
+                String name = "Umh\u00fcllende " + columns[i].getName();
+                WQKms wqkms = new WQKms(kms, oqs, ows, name);
+                infoldings.add(wqkms);
+            }
+        }
+
+        int N = infoldings.size();
+        if (N > 0) {
+            WQKms [] newResults = new WQKms[results.length + N];
+            System.arraycopy(results, 0, newResults, 0, results.length);
+            for (int i = 0; i < N; ++i) {
+                newResults[i+results.length] = infoldings.get(i);
+            }
+            results = newResults;
+        }
+
+        return results;
+    }
+
     protected String createName(int index) {
         // TODO: i18n
         StringBuilder sb = new StringBuilder(isQ ? "Q" : "W");