How do springs connect to underground cave drainage systems?

In karst terrain, springs serve as the primary outlets for underground water-carrying conduits, which are the integrated drainage systems formed by the dissolution of bedrock.1

These systems connect to springs through a network of continuous conduits that facilitate the rapid movement of subsurface water. Caves are essentially fragments of these conduit systems; while some are dry passages left behind as streams cut to lower levels, others remain active, water-filled channels that transport water toward these discharge points.1

The connection is often established when surface streams or rainfall enter the subsurface through sinkholes or closed depressions. As this water flows through joints and fractures in the bedrock, it enlarges these openings into integrated drainage channels. Over time, these channels evolve to carry increasing volumes of water, eventually discharging at the surface as springs of often majestic size. In some regions, water may surface at a spring, flow across the landscape, and subsequently disappear underground again to rejoin the internal drainage network.123