Burnt mounds are a familiar feature of the Irish landscape, typically associated with prehistoric cooking or bathing, where fire-heated stones were used to boil water in timber-lined pits. What makes the Greenhills example unusual is the level of hydraulic organisation involved, with water apparently being managed and directed between the troughs through a series of shallow lips on the downslope sides.

The site sits in relation to the garden wall of Greenhills, and excavation also uncovered the continuation of that wall's foundation, suggesting the mound and its water-management features were either incorporated into, or at least adjacent to, a later designed landscape. The combination of a prehistoric or early historic water-processing site with the remnants of formal garden architecture is a fairly rare overlap, one that points to layers of use and reuse across very different periods. Whether the sluice-like arrangements were part of the mound's original function or represent later adaptation is not entirely clear, but the presence of a deliberate stone gate-stone within one of the troughs implies a degree of careful engineering that goes beyond simple communal cooking.