the cárcamo de dolores (sump of dolores) is a hydraulic structure located on the second section of chapultepec park, in mexico city, comprising the building designed by architect ricardo rivas, inside the originally underwater mural "agua, el origen de la vida" ("water, source of life") of mexican muralist diego rivera, the art installation cámara lambdoma by ariel guzik, and in outside, the tlaloc fountain, also of rivera.