public override int GetHashCode()
{
unchecked
{
int hashCode = Top.GetHashCode();
hashCode = (hashCode * 397) ^ BelowPhreaticLevel.GetHashCode();
hashCode = (hashCode * 397) ^ DiameterD70.GetHashCode();
hashCode = (hashCode * 397) ^ Permeability.GetHashCode();
return(hashCode);
}
}