A downspout extension system for a terminal end of a downspout is provided. The downspout extension system can include a collar member, an enclosure member, and an extension member. The collar member can include a first end being open and a second end being closed. The collar member can include a first tab disposed directly across from a second tab. The enclosure member can be selectively slidably disposed in the first end of the collar member. The extension member can be disposed on the collar member. The extension member can include a first aperture configured to receive the first tab and a second aperture configured to receive the second tab. The collar member and the enclosure member can together be configured to receive the terminal end of the downspout and to securely hold the terminal end between the collar member and the enclosure member with mechanical force.

A downspout-to-curb drain assembly includes a downspout boot defining an interior channel terminating in a downspout boot outlet, a trench drain assembly in fluid communication at a first end thereof with the downspout boot interior channel and outlet, and a curb opening defining an interior channel in fluid communication with the trench drain assembly at a second end thereof. Advantageously, the downspout boot outlet, trench drain assembly, and curb opening transport water runoff below grade.

An insert (400) for a rainwater downpipe (300) is fluidly coupled between a first section (310) and a second section (320) of the rainwater downpipe (300). A rainwater reservoir (500) is defined within the insert (400) to store the rainwater received from the first section (310) therein. The rainwater reservoir (500) includes a side surface (510), a bottom surface (520) and an outlet opening (522) fluidly coupled to the second section (320). A valve element (530) is disposed within the rainwater reservoir (500) to allow or deny the passage of the stored rainwater in the rainwater reservoir (500) through the outlet opening (522). The insert (400) is characterized in that the side surface (510) of the rainwater reservoir (500) further defines a rainwater harvesting opening (549) adapted to allow access to the rainwater stored in the rainwater reservoir (500).

A splash block can include a base surface and a raised sidewall surrounding the base surface except for an outlet side of the base surface. The raised sidewall defines an inlet sidewall located opposite the outlet side of the base and a pair of longitudinal sidewalls spanning from the inlet sidewall towards the outlet side of the base. A tab is provided to the inlet sidewall. The tab is attached to the inlet sidewall such that the tab can pivot between a first position extending horizontally outwardly away from the base surface and a second position folded under the splash block such that the tab does not protrude outwardly from the raised sidewall. A first aperture can be defined in the tab to receive an anchor spike. A second aperture can be defined in the base surface adjacent to the outlet side in order to receive an anchor spike.