--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/SieveArray.java	Mon Oct 01 14:51:25 2012 +0200
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/SieveArray.java	Mon Oct 01 15:51:55 2012 +0200
@@ -88,5 +88,29 @@
     public double getNormLoads(int index) {
         return this.normLoads[index];
     }
+
+    public double sandNormFraction() {
+        double sum = 0d;
+        for (int i = 8; i < normLoads.length; ++i) {
+            sum += normLoads[i];
+        }
+        return sum;
+    }
+
+    public double coarseNormFraction() {
+        double sum = 0d;
+        for (int i = 0; i < 4; ++i) {
+            sum += normLoads[i];
+        }
+        return sum;
+    }
+
+    public double gravelNormFraction() {
+        double sum = 0d;
+        for (int i = 4; i < 8; ++i) {
+            sum += normLoads[i];
+        }
+        return sum;
+    }
 }
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