--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/flowdepth/FlowDepthUtils.java	Tue Aug 07 12:43:53 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/flowdepth/FlowDepthUtils.java	Tue Aug 07 14:06:49 2018 +0200
@@ -10,6 +10,7 @@
 package org.dive4elements.river.artifacts.sinfo.flowdepth;
 
 import org.dive4elements.river.artifacts.model.Calculation;
+import org.dive4elements.river.utils.Formatter;
 
 /**
  * @author Gernot Belger
@@ -55,4 +56,13 @@
         /* >= 1998 */
         return 3;
     }
+
+    /**
+     * Calculates a flow depth, rounded to the active scale
+     */
+    public static double calcFlowDepth(final double wst, final double bedHeight) {
+        if (Double.isNaN(wst) || Double.isInfinite(wst) || Double.isNaN(bedHeight) || Double.isInfinite(bedHeight))
+            return Math.max(wst - bedHeight, 0.0);
+        return Math.max(Formatter.roundFlowDepth(wst).subtract(Formatter.roundFlowDepth(bedHeight)).doubleValue(), 0.0);
+    }
 }
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