Index: DamClassic/trunk/src/Dam/Data/CalculationHelper.cs =================================================================== diff -u -r1440 -r1441 --- DamClassic/trunk/src/Dam/Data/CalculationHelper.cs (.../CalculationHelper.cs) (revision 1440) +++ DamClassic/trunk/src/Dam/Data/CalculationHelper.cs (.../CalculationHelper.cs) (revision 1441) @@ -135,7 +135,9 @@ parameters.CalculationOptions.MinimalCircleDepth = location.MinimalCircleDepth; if (location.ModelFactors.RequiredSafetyFactorStabilityInnerSlope == null) + { location.ModelFactors.RequiredSafetyFactorStabilityInnerSlope = 1.0; + } parameters.ZoneAreas = new MStabZoneAreas {