--- a/flys-artifacts/src/main/java/de/intevation/flys/exports/DurationCurveGenerator.java	Thu Feb 16 11:54:10 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/DurationCurveGenerator.java	Thu Feb 16 12:35:51 2012 +0000
@@ -161,6 +161,27 @@
     }
 
 
+    /**
+     * This method overrides the method in the parent class to set the lower
+     * bounds of the Q axis to 0. This axis should never display negative
+     * values on its own.
+     */
+    @Override
+    protected boolean zoomY(XYPlot plot, ValueAxis axis, Range range, Range x) {
+        boolean zoomin = super.zoom(plot, axis, range, x);
+
+        if (!zoomin && axis instanceof IdentifiableNumberAxis) {
+            String id = ((IdentifiableNumberAxis) axis).getId();
+
+            if (YAXIS.Q.toString().equals(id)) {
+                axis.setLowerBound(0d);
+            }
+        }
+
+        return zoomin;
+    }
+
+
     @Override
     public void doOut(
         ArtifactAndFacet artifactFacet,