The influence ofa small slope and weak sedimentation on the behavior of non-conservative turbidity current heads are experimentally investigated. Experiments are carried out in the slope range 0°≤Θ≤2.1° with two different sediments to get a reasonably wide range of the ratio of fall velocity of particles,vs, to the velocity of the head,Uf. The limiting case ofvs= 0 (conservative gravity current) is investigated by a series of saline gravity current experiments.