A review is given of the progress of a SADM investigation into the causes of drainage problems being experienced in some South Australian irrigation areas located along the River Murray. Drilling and geological survey work have been carried out over the past four months. Both percussion and rotary machines have been used, and 53 holes have been completed to date. The first area surveyed lies on the eastern bank of the River Murray between Swan Reach and Cadell, and covers an area of about 100 square miles. This represents approximately 25% of the total area to be involved in the whole investigation. One private irrigation scheme (Greenways) and one proposed development (Swan Reach) have been drilled in some detail. Drilling has evaluated the potentialities of six other minor zones. Detailed work has also started in the Waikerie area to examine the effectiveness of the drainage bores already in existence, and to propose sites and depths for future bores.