Sub-irrigated raised garden bed

What you need:

1. raised garden bed
2. liner. You need an impervious plastic sheeting (not weed protector than allows water to drain)
3. 4-inch perforated corrugated pipe (Flex-Drain)
4. 1/2 to 3/4-inch vinyl draining pipe

#3 and 4 are available at Lowe's.

Sub-irrigated planters (SIPs) are known erroneously as "self-watering".

References:

Inside Urban Green: Corrugated Drain Pipe Sub-Irrigated Planter Bed http://bit.ly/OIrp2E
A DYI sub-irrigation systems for planters-SIP - a set on Flickr http://bit.ly/OLgiK2
Inside Urban Green: Toronto » Rooftop SIP City http://bit.ly/NoNHdv
Sub-irrigated Raised Beds & Planters (SIPs) - a set on Flickr http://bit.ly/NeIMJY

Videos:

Food Is Free Wicking Bed Construction Demo - YouTube http://bit.ly/OIrqnd
2011.09.09 - Sub-Irrigated Container Garden - YouTube http://bit.ly/OIrnYs
Wicking beds, barrels & IBCs - Playlist by Rob Bob -YouTube http://bit.ly/1ujvovr
Wicking beds - Sustainable Gardening Australia Footprint Flicks - YouTube http://bit.ly/OIrraI
'Above ground' Wicking Raised Garden Bed - Water Installations and Greywater Reuse Sys - YouTube http://bit.ly/OIrt2m
Self-Watering Container Gardening System: Richard's Garden - YouTube http://bit.ly/OIrtPK