--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/flowdepth/FlowDepthCalculation.java	Wed Feb 14 18:10:28 2018 +0100
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/sinfo/flowdepth/FlowDepthCalculation.java	Wed Feb 14 18:10:53 2018 +0100
@@ -155,6 +155,8 @@
         final List<BedHeightValue> sortedValues = new ArrayList<>(values);
         Collections.sort(sortedValues, new BedHeightStationComparator());
 
+        SoilKind lastKind = SoilKind.mobil;
+
         for (final BedHeightValue bedHeightValue : sortedValues) {
 
             final Double station = bedHeightValue.getStation();
@@ -179,8 +181,46 @@
                 final double discharge = Double.NaN;
 
                 // FIXME: calculate tkh
-                final double tkh = 0;
-                final double flowDepthTkh = flowDepth - tkh;
+
+                // REMARK: bissl spielerei zum testen damit die sohlart nicht zu schnell wechselt
+                final boolean changeKind = Math.random() > 0.95;
+                SoilKind kind;
+                if (changeKind) {
+                    switch (lastKind) {
+                    case starr:
+                        kind = SoilKind.mobil;
+                        break;
+
+                    case mobil:
+                    default:
+                        kind = SoilKind.starr;
+                        break;
+
+                    }
+                } else
+                    kind = lastKind;
+                lastKind = kind;
+
+                final double tkh = 100 + 10 * (Math.random() - 0.5);
+
+                final double flowDepthTkh;
+                final double tkhUp;
+                final double tkhDown;
+                switch (kind) {
+                case starr:
+                    flowDepthTkh = wst - (meanBedHeight + tkh / 100);
+                    tkhUp = tkh;
+                    tkhDown = 0;
+                    break;
+
+                case mobil:
+                default:
+                    flowDepthTkh = wst - (meanBedHeight + tkh / 200);
+                    tkhUp = tkh / 2;
+                    tkhDown = -tkh / 2;
+                    break;
+                }
+
 
                 // REMARK: access the location once only during calculation
                 final String location = LocationProvider.getLocation(river.getName(), km);
@@ -190,7 +230,8 @@
 
                 final String gaugeLabel = gauge == null ? notinrange : gauge.getName();
 
-                resultData.addRow(km, flowDepth, flowDepthTkh, tkh, wst, discharge, wstLabel, gaugeLabel, meanBedHeight, bedHeightLabel, location);
+                resultData.addRow(km, flowDepth, flowDepthTkh, kind, tkh, tkhUp, tkhDown, wst, discharge, wstLabel, gaugeLabel, meanBedHeight, bedHeightLabel,
+                        location);
             }
             catch (final FunctionEvaluationException e) {
                 /* should only happen if out of range */