At the dawn of creation, there was water. This paper seeks to examine how Augustine's enarrationes in Psalmos shape the image of water to construct poetic realms of memory. Liquid and solid, heavenly and earthly, through rivers and seas, the multi-faceted image of water fashions the memory of creation and re-creation in Augustine's interpretation of the Psalms. With occasional references to Genesis (including De Genesi aduersus Manicheos; De Genesi ad litteram; Confessions XIII), this paper is an invitation to re-interpret the Psalms with Augustine. It hopes to demonstrate how the literary motif of water generates and nourishes the Psalter poetic of memory. This poetics offers a visualization of history that draws on the substance of aquatic images available throughout the Psalter. Through the image of water, it is possible to navigate both the psalmists' and Augustine's historical and spiritual imagination. At the crossroads of cosmology, theological aesthetics and environmental humanities, this investigation proposes a two-fold aquatic journey. Inspired by Pierre Nora's lieux de mémoire, Paul Ricoeur's phenomenology of memory and Gaston Bachelard's insights into the imagination of water, we first attempt to see how water moves through the Psalter and within particular enarrationes in Psalmos. Weaving micro-structure with macro-structure, the analysis will delineate the Augustinian story told by the imagery of water. Second, the essay will see how water intertwines with memory, how it shapes memory through various poetic devices and how the Augustinian construction of memory reciprocally shapes the image of water. A literary-poetic study of several clusters of psalms (selected for their significant relationship between water and memory) will demonstrate the changing tide of this memorial flow in a defiance of the border between materiality and immateriality. In other words, the study invites to attend to the time and tides of Augustine's conscience poétique.