Panchromatic, color, and infrared films were used to locate fracture traces as an aid to the interpretation of the occurrence and movement of groundwater in a limestone area in Alabama. Air photography using color and infrared films resulted in greater interpreter confidence and showed correlation with geologic structure. Wells drilled along fracture traces yielded substantially more water than the average of the randomly located wells. The thickness of the residuum had no noticeable control over the fracture-trace concentration. Previous models explaining the relationship between fracture tracers and solution activity dealt with a single homogeneous limestone aquifer. In this area, two limestone aquifers separated by an aquiclude produce two different lithologic units on which solutional features that are reflected by fracture traces are developed. (WRSIC abstract)