Abstract: A filter assembly is mounted on the discharge end of an outlet pipe of a storm water drainage system for filtering and collecting silt, dirt and other debris from runoff water flows. The filter assembly includes a collar member mounted within the discharge end of the outlet pipe and a filter bag that is removably attached to a downstream end of the collar member. The water flow being discharged from the outlet pipe of the storm water drainage system is channeled through the filter bag, which filters and collects the sediment and debris therefrom while enabling the substantially cleaned runoff water to pass through the filter bag for drainage into a stream, pond, or other water source.

Abstract: A temporary silt guard for temporarily enclosing the open upper end of a drop inlet during the construction of a road system in commercial and residential developments is adapted to fit over and seat upon the open end of the drop inlet to enable runoff water to drain into the drop inlet while preventing silt and debris from being carried into and collected therein. The silt guard includes a body portion formed from a series of spaced slats defining radially spaced passages through the silt guard. A filter cover is received over the silt guard, formed from a silt screen material, with the slats of the body portion providing rigidity and strength to the filter cover. The filter cover filters out silt and debris while enabling storm water and runoff to drain into the drop inlet.