overflow spring
type of spring where the groundwater emerging at the Earth's surface does not simply flow downward following gravity but is forced to rise due to a geological structure in the subsurface that acts as a barrier to water flow
en-GB/ˌəʊvəˈfləʊ ˈspɹɪŋ/
en-US/ˌoʊvɚˈfloʊ ˈspɹɪŋ/