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. A phase change memory cell includes an electrode comprising an electrode material; a dielectric layer over the electrode; a via hole in the dielectric layer; and a single crystal of a phase change material located in the via hole, the single crystal contacting the electrode at the bottom of the via hole. Flexible paths are defined by elements comprising these nodes or waypoints and loci or associated spaces, as well as with other constraints. The integrator is further coupled to receive a current sense signal responsive to a current flowing in the power switch when the power switch is on.