Runoff from the roofs of 15 houses in a medium-density residential development in suburban Adelaide, capital city of South Australia, is being collected and temporarily stored in a gravel-filled stormwater retention trench installed in a centrally located reserve. The site is underlain by an upper level Quaternary aquifer, ambient salinity 2000 mg/l, which receives stormwater supplied from the trench via a bore during large winter storm events. Water pumped from the aquifer in summer shows a quality suitable for open space irrigation. Observations made during the second half of 1992 have highlighted aspects of the design which require modification in order to improve the performance of the retention/recharge/retrieval system. Data collected between August and October have indicated that the volume of stormwater stored in the aquifer on an annual basis will be sufficient to meet the irrigation needs of the reserve.