The first wicking bed.

Add growing medium

Add rock

Line with plastic and add hose

Make sure the bed is even.

This bed was created about two years ago.  I have been very happy with it.  It is topped up with compost, shavings from the chook sheds and sheep manure.  I mulch with sugar cane mulch in Summer.  I find it only requires watering once a week.  The mulch prevents evaporation.  This bed has been one of the great successes in  my garden.