An experimental study is made of the selective withdrawal characteristics of a round horizontal axis pipe intake located in a vertical wall. The ambient fluid system has a two-layer stratification with a diffuse interface. The results for incipient withdrawal indicate considerably lower critical Froude numbers than that obtained by earlier studies by CRAYA (1949) and GARIEL (1949). Geometry effects due to the intake diameter and the pycnocline thickness appear to cause this discrepancy. The supercritical withdrawal ratio from both fluid layers exhibits a unique dependence on the densimetric Froude number normalized by its critical value.