Add a uniform precip event

def add_uniform_precip_event(self, intensity, duration):
        """
        Add a uniform precip event
        """
        self.project_manager.setCard('PRECIP_UNIF', '')
        self.project_manager.setCard('RAIN_INTENSITY', str(intensity))
        self.project_manager.setCard('RAIN_DURATION', str(duration.total_seconds()/60.0))