This DBA focuses specifically on the hydrological and water-management infrastructure within the Ruperra Roman complex. It documents a spring-fed well, regulating sump, long-distance boxed culverts, multiple bathhouses (A, B, and C), drainage systems, defensive sumps, and a large engineered exercise or swimming channel approximately 545 m in length. The assessment demonstrates deliberate segregation of clean water and waste, gravity-assisted flow, landscape-responsive alignment, and defensive considerations integrated with the perimeter wall. Bathhouses are interpreted as a hierarchical sequence, with water reused progressively before controlled discharge. A preserved dark oak timber beam aligned with the channel is interpreted as a hydraulic control feature, such as a sluice or weir. The system also incorporates flood mitigation measures protecting the amphitheatre basin. Overall, the DBA concludes that the hydrological network represents advanced Roman or Romano-British engineering, with high archaeological potential and strong prospects for preserved subsurface features, warranting careful protection and further investigation.