A stormwater inlet near an upper edge of a layered filter media vessel is equipped with a distribution header that ensures effective use of the surface area of the filter media by providing plural spaced streams of stormwater thereat, each at a point of impact having its energy dissipated by a layer of material that covers the upper layered filter media surface. The switch position of the switching device determines whether the first generator andor the second generator is energized, depending on the operational condition of the powered system. The flow conditioning apparatus includes an inlet, an outlet, and a swirl chamber extending along a swirl axis. The application then queries or enumerates message elements from the instantiated persistent dictionary, and performs the programmed response. Alternatively, the ratio Ra is not larger than 30 percent, where \u201cRa\u201d is the resistance of the heat resistor before sintering and \u201cRb\u201d is the resistance of the heat resistor after sintering.