The Groundwater Program of the Department for Water Resources (DWR - previously with PIRSA) was engaged by the Torrens Catchment Water Management Board to assess the aquifer storage and recovery (ASR) potential at the Cheltenham Racecourse, using wetland - treated stormwater runoff to artificially recharge Tertiary aquifers. In the racecourse area the first and second Tertiary aquifers are the thickest and the most productive, with naturally held groundwater of relatively low salinity. The greatest proportion of this groundwater being presently extracted for industrial and recreational use comes from the first Tertiary aquifer. This assessment was based on evaluating the hydraulic properties of the aquifer, at the site, by testing the nearby existing Saint Clair Recreation Centre Oval irrigation well. This water well, completed as an open hole, penetrates the full sequence of the T-1 aquifer. Given that the aquifer is homogenous and continuous over the Adelaide metropolitan area, the aquifer properties derived from those tests should be indicative of those at the Cheltenham Racecourse. The St Clair well was subsequently discharge tested by DWR Groundwater Technical Services on the 23 rd February, 2000. Due to oval watering requirements the well was not available for the injection component of the testing until the 10 May, 2000.