--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/uinfo/inundationduration/InundationDurationState.java	Thu Oct 25 17:11:59 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/uinfo/inundationduration/InundationDurationState.java	Mon Oct 29 17:57:30 2018 +0100
@@ -24,6 +24,10 @@
 import org.dive4elements.river.artifacts.model.map.WMSLayerFacet;
 import org.dive4elements.river.artifacts.uinfo.UINFOArtifact;
 import org.dive4elements.river.artifacts.uinfo.inundationduration.InundationDurationCalculationResult.WmsLayer;
+import org.dive4elements.river.model.RiverAxisKm;
+import org.dive4elements.river.utils.GeometryUtils;
+
+import com.vividsolutions.jts.geom.Envelope;
 
 /**
  * @author Domenico Nardi Tironi
@@ -121,4 +125,31 @@
 
         return new InundationDurationCalculation(context).calculate(artifact);
     }
+
+    /**
+     * The extent is restricted to the selected station range
+     */
+    @Override
+    protected Envelope getExtent(final boolean reproject) {
+
+        final InundationDurationAccess access = new InundationDurationAccess((UINFOArtifact) this.artifact);
+
+        final double lowerKm = access.getLowerKm();
+        final double upperKm = access.getUpperKm();
+
+        final List<RiverAxisKm> axisKms = RiverAxisKm.getRiverAxisKms(getRiverId(), lowerKm, upperKm);
+
+        Envelope max = null;
+
+        for (final RiverAxisKm ax : axisKms) {
+            final Envelope env = ax.getGeom().getEnvelopeInternal();
+
+            if (max == null)
+                max = env;
+            else
+                max.expandToInclude(env);
+        }
+
+        return max != null && reproject ? GeometryUtils.transform(max, getSrid()) : max;
+    }
 }
\ No newline at end of file

--- a/backend/src/main/java/org/dive4elements/river/model/RiverAxisKm.java	Thu Oct 25 17:11:59 2018 +0200
+++ b/backend/src/main/java/org/dive4elements/river/model/RiverAxisKm.java	Mon Oct 29 17:57:30 2018 +0100
@@ -10,6 +10,7 @@
 
 import java.io.Serializable;
 import java.math.BigDecimal;
+import java.util.Collections;
 import java.util.List;
 
 import javax.persistence.Column;
@@ -19,94 +20,105 @@
 import javax.persistence.OneToOne;
 import javax.persistence.Table;
 
+import org.dive4elements.river.backend.SessionHolder;
+import org.hibernate.Query;
 import org.hibernate.Session;
-import org.hibernate.Query;
 import org.hibernate.annotations.Type;
 
 import com.vividsolutions.jts.geom.Point;
 
-import org.dive4elements.river.backend.SessionHolder;
-
-
 @Entity
 @Table(name = "river_axes_km")
-public class RiverAxisKm
-implements   Serializable
-{
-    private Integer    id;
-    private River      river;
+public class RiverAxisKm implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+
+    private Integer id;
+    private River river;
     private BigDecimal km;
-    private Point      geom;
-
+    private Point geom;
 
     public RiverAxisKm() {
     }
 
-
     @Id
     @Column(name = "id")
     public Integer getId() {
-        return id;
+        return this.id;
     }
 
-
-    public void setId(Integer id) {
+    public void setId(final Integer id) {
         this.id = id;
     }
 
-
     @OneToOne
     @JoinColumn(name = "river_id")
     public River getRiver() {
-        return river;
+        return this.river;
     }
 
-
-    public void setRiver(River river) {
+    public void setRiver(final River river) {
         this.river = river;
     }
 
-
     @Column(name = "km")
     public BigDecimal getKm() {
-        return km;
+        return this.km;
     }
 
-
-    public void setKm(BigDecimal km) {
+    public void setKm(final BigDecimal km) {
         this.km = km;
     }
 
-
     @Column(name = "geom")
     @Type(type = "org.hibernatespatial.GeometryUserType")
     public Point getGeom() {
-        return geom;
+        return this.geom;
     }
 
-
-    public void setGeom(Point geom) {
+    public void setGeom(final Point geom) {
         this.geom = geom;
     }
 
-
     /**
      * Returns a list of RiverAxisKm objects for a given river.
      *
-     * @param riverid The ID of a river in the database.
+     * @param riverid
+     *            The ID of a river in the database.
      *
      * @return a list of RiverAxisKm objects.
      */
-    public static List<RiverAxisKm> getRiverAxisKms(int riverid) {
-        Session session = SessionHolder.HOLDER.get();
+    public static List<RiverAxisKm> getRiverAxisKms(final int riverid) {
+        final Session session = SessionHolder.HOLDER.get();
 
-        Query query = session.createQuery(
-            "from RiverAxisKm where river.id =:riverid");
+        final Query query = session.createQuery("from RiverAxisKm where river.id =:riverid");
         query.setParameter("riverid", riverid);
 
-        List<RiverAxisKm> list = query.list();
+        final List<RiverAxisKm> list = query.list();
 
         return list;
     }
-}
-// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
+
+    public static List<RiverAxisKm> getRiverAxisKms(final int riverId, final double lowerKm, final double upperKm) {
+        final Session session = SessionHolder.HOLDER.get();
+
+        assert lowerKm <= upperKm;
+
+        if (Double.isNaN(lowerKm) || Double.isInfinite(lowerKm))
+            return Collections.emptyList();
+        if (Double.isNaN(upperKm) || Double.isInfinite(upperKm))
+            return Collections.emptyList();
+
+        final BigDecimal fromKm = BigDecimal.valueOf(lowerKm);
+        final BigDecimal toKm = BigDecimal.valueOf(upperKm);
+
+        final Query query = session.createQuery("from RiverAxisKm where river.id =:riverid AND km >= :fromKm AND km <= :toKm");
+        query.setParameter("riverid", riverId);
+        query.setParameter("fromKm", fromKm);
+        query.setParameter("toKm", toKm);
+
+        final List<RiverAxisKm> list = query.list();
+
+        return list;
+    }
+}
\ No newline at end of file