--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/MainValuesArtifact.java	Tue Jul 02 07:09:19 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/MainValuesArtifact.java	Tue Jul 02 07:10:25 2013 +0200
@@ -316,6 +316,21 @@
             return spawnState();
     }
 
+    /**
+     * Access the Gauge that the mainvalues are taken from.
+     * @return Gauge that main values are taken from or null in case of
+     *         invalid parameterization.
+     */
+    protected Gauge getGauge(double km) {
+        River river = RiverUtils.getRiver(this);
+
+        if (river == null) {
+            logger.error("River is null");
+            return null;
+        }
+
+        return river.determineGaugeByPosition(km);
+    }
 
     /**
      * Access the Gauge that the mainvalues are taken from.
@@ -389,12 +404,53 @@
     }
 
 
-    /**
-     * Get a list of "W" main values.
-     * @param atGauge if true, do not interpolate
-     * @return list of W main values.
-     */
-    public List<NamedDouble> getMainValuesW(boolean atGauge) {
+    /** Get main values of km. */
+    public List<NamedDouble> getMainValuesW(double[] kms) {
+        List<NamedDouble> filteredList = new ArrayList<NamedDouble>();
+        boolean atGauge = false;
+        double gaugeDatum = 0d;
+        Gauge gauge = getGauge(kms[0]);
+        if (gauge == null) {
+            return filteredList;
+        }
+        else if (Math.abs(kms[0] - gauge.getStation().doubleValue()) < 1e-4) {
+            atGauge = true;
+            gaugeDatum = gauge.getDatum().doubleValue();
+        }
+
+        WstValueTable interpolator = WstValueTableFactory.getTable(RiverUtils.getRiver(this));
+        Calculation c = new Calculation();
+
+        double gaugeStation = gauge.getStation().doubleValue();
+        double w_out[] = {0.0f};
+        double q_out[] = {0.0f};
+        if (gauge != null) {
+            List<MainValue> orig = gauge.getMainValues();
+            for (MainValue mv : orig) {
+                if (atGauge) {
+                    if (mv.getMainValue().getType().getName().equals("W")) {
+                        filteredList.add(new NamedDouble(mv.getMainValue().getName(),
+                                mv.getValue().doubleValue()));
+                    }
+                } else
+                // We cannot interpolate the W values, so derive them
+                // from given Q values.
+                if (mv.getMainValue().getType().getName().equals("Q")) {
+                    interpolator.interpolate(mv.getValue().doubleValue(),
+                            gaugeStation, kms, w_out, q_out, c);
+
+                    filteredList.add(new NamedDouble(
+                                "W(" + mv.getMainValue().getName() +")",
+                                w_out[0]
+                                ));
+                }
+            }
+        }
+        return filteredList;
+    }
+
+
+    public List<NamedDouble> getMainValuesW(boolean atGauge, double[] kms) {
         List<NamedDouble> filteredList = new ArrayList<NamedDouble>();
         Gauge gauge = getGauge();
         WstValueTable interpolator = WstValueTableFactory.getTable(RiverUtils.getRiver(this));