Gutter Glossary
Rain Chain
A decorative alternative to an enclosed downspout, using a vertical series of linked cups or rings to guide water from the gutter to the ground or a collection basin.
What is a Rain Chain?
A decorative alternative to an enclosed downspout, using a vertical series of linked cups or rings to guide water from the gutter to the ground or a collection basin. Rain chains (kusari-doi in Japanese, where they originated) replace the enclosed downspout with a vertical chain of ornamental cups, rings, or links.
Full Definition
Rain chains (kusari-doi in Japanese, where they originated) replace the enclosed downspout with a vertical chain of ornamental cups, rings, or links. Water from the gutter flows down the outlet hole, catches on the top cup or link, and cascades from element to element in a visible stream. They are primarily aesthetic features found on Japanese-style gardens, modern landscaping, and some Craftsman-style homes.
From a drainage engineering standpoint, rain chains have significant limitations compared to enclosed downspouts. Flow capacity is substantially lower — a standard 2x3 downspout can handle 30+ gallons per minute, while most rain chains begin to overflow or splash significantly above 5–10 gallons per minute. This makes them unsuitable as primary drainage on roof areas larger than approximately 200 square feet per chain in Sacramento's winter rain conditions.
Rain chains are also susceptible to wind displacement, require a collection basin or splash block at the base, and can freeze in below-freezing temperatures in foothill areas. Their best application in Sacramento is as supplemental drainage or focal points at limited roof discharge points — a single rain chain at a decorative corner combined with conventional downspouts for primary drainage.
Also Known As
- kusari-doi
- chain downspout
Related Terms
Downspout
The vertical pipe that carries water from the gutter trough to the ground or drainage system, sized to match the volume capacity of the gutter run it serves.
Downspout Extension
An add-on at the bottom of a downspout that carries roof runoff 4–10 or more feet away from the foundation — a critical foundation protection measure in Sacramento's clay-soil conditions.
Splash Block
A small concrete or plastic pad placed under a downspout outlet to disperse water flow and prevent soil erosion and foundation undermining at the discharge point.
Gutter Elbow
An angled fitting — typically 45° or 90° — used to redirect a downspout around an eave, soffit, or wall obstacle, or to angle the terminal end away from the building foundation.
K-Style Gutter
The most common residential gutter profile in the US, with a flat back, decorative ogee-shaped front face, and rectangular cross-section that holds more water per linear foot than half-round gutters of equivalent size.
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